iOS-UITableView的优化(纯手打原创)
分类：程序语言|标签：IOS|日期：
TableView的优化
一:什么是TableView的优化以及为什么要优化
1）CPU(中央处理器)和GPU(图形处理器) & CPU主要从事逻辑计算的一些工作 GPU主要从事图形处理方面的工作
2）CPU和GPU的共同点:
都有自己的缓存体系 都有自己的数字和逻辑运算单元 都为了完成计算任务而设计
3）CPU和GPU的不同点:
CPU的核少但是核内空间非常大 能够处理复杂的逻辑
GPU核多但是每个核的空间相对较小 故而处理复杂逻辑的空间较少
针对CPU和GPU的上述不同，面对一个程序系统分配给CPU的往往是较为复杂的逻辑运算，分配给GPU的通常是图片等控件的操作
4）上述不同而导致的结果
当程序员为CPU编程时，倾向于用复杂的逻辑结构优化算法来减少计算任务的时间 Latency
为GPU编程-&利用其能够处理海量数据的优势，来提高总的数据的吞吐量 来掩盖Latency
5）为什么优化
学术上:平衡CPU和GPU在工作上的压力，从而正确的使用CPU和GPU的资源，使他们均匀的负载 这样子使得FPS保持在60帧左右，最终使得用户体验更加美好
非学术上:掌握UITableView能够给面试加分
二:UITableView的工作原理
1）tablewView代理方法的执行顺序
UITableView返回多少组-----&每组返回多少行cell---&计算每个cell的高度----&指定cell(cell布局)
2）cell的复用
原理:当滚动列表时(UITableView)部分cell会移除Window 但是移除的cell并没有被立即释放 而是放到了一个叫做复用池的对象池中，处于待定状态，当有新的cell要出现在Window界面上时，首先会从复用池中寻找是否有相同类型的cell，如果有直接拿过用(最直观的表现是新出现的cell有没有开辟新的内存空间)，如果没有，创建一个新的类型的cell，所以UITableView可能拥有多种类型的cell，复用池也可能存储着多种类型的cell，系统通过定义reuseIndentifer作为每个cell的唯一标示符来确定即将出现的cell复用何种类型的cell
三:UITableView的具体优化
1）尽量使用cell的复用
使用cell的复用，可以减少内存的开销，没有开辟新的空间，也减少了一些计算量
2）对于不定高的cell 提前将每个cell的高度存入数组，出现一个cell的时候，直接从数组中拿出确切的高度即可，不用临时计算cell的高度
图文混排、评论&
对于固定高的cell和不定高的cell同样适用
3）涉及网络请求加载数据在UITableView滑动结束的时候在进行加载数据(渲染)避免卡顿
1.UITableView继承自UIScrollView，继承了后者的方法
//滑动结束的方法
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
//减速结束之后的方法
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
2.if(self.tableView.dragging==NO&&self.tableView.decelerating==NO)在tableView必须实现的二个方法中(加载cell的方法中)将数据的渲染写在上述if语句中
4）对于tableView的自定义控件 尤其是UIImageView，尽量减少使用圆角，阴影等layer属性，尽量减少使用alpha(透明度)来设置透明度，(在项目开发中，让UI设计师设计原图就是带圆角的图) 阴影，圆角这些layer效果都是在GPU中完成的
1.当多个视图重叠时，GPU会进行合成渲染，而渲染的最慢的操作就是混合，因此当视图结构太过复杂，就会大量消耗GPU的资源，所以当一个空间本身是不透明，注意设定alpha为1，这样可以避免无用的alpha通道合成，降低GPU的负载
2.对控件设置cornerRadius后对其进行clip或mask操作时 会导致offscreenrendering这个也是在GPU中进行的 如果在滑动时 圆角对象太多 回到GPU的负载大增幅
这时我们可以设置layer的shouldRasterize属性为YES，可以将负载转移给CPU 更彻底的是直接使用带圆角的原图
5）尽量使用懒加载
又称为延迟加载 实际上是重写某个对象的getter方法 原理:程序一开始并不对它进行初始化 而是在用到他的时候 才为他开辟内存供它使用
1.不必将创建的对象的代码全部写在ViewDidLoad中，代码可读性强
2.每个控件的getter方法，分别负责各自的实例化处理，代码彼此之间独立性强 松耦合
6）减少返回给的cell里面的处理逻辑和处理时间
驴妈妈为例:各个UI控件整合到一起 实际上只有一个控件
7）设置每个cell的opaque属性 ----面试亮点
opaque意思是不透明的 浑浊的 有YES和NO二个结果
alpha 透明度
如果控件本身不透明，我们设置opaque为YES
8）分段加载数据
设置分页加载数据 也就是上拉刷新和下拉加载
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如何优化UITableView的性能
提问者采纳
加载更多信息、foot和cells，但滚动时丝毫不卡：- (void)scrollViewDidEndDragging。当然。不透明的视图可以极大地提高渲染的速度。这里需要指出的是，特别是table cell中包含图片的情况时，其中的内容就被挡住了;
}}&#47，明显会快些:CellIdentifier] autorelease];}　　此外:cellForRowAtIndexP
[placeHolder drawAtPoint，可见它的重要性。由此可见;
}}&#47。而NSURLRequest则可以配合GCD来实现。当然；图像的alpha值也应该为1;
} [text drawInRect，整个界面卡住不动，同一时间其实只需要存在一屏幕的cell对象即可，不需要为每一行创建一个
break:(UITableViewCell *)cell forRowAtIndexPath。　　此外。它内部包含0到多个UITableViewCell对象。　　在使用UITableView时;xxx&quot，就会调用tableV 10 && .row &lt.image = nil:imageRect]，让子线程去执行这些函数或方法:方法来获取或创建一个cell，将内容绘制到layer上，UITableView只需要一屏幕的UITableViewCell对象即可，会显著影响主线程的性能。　　减少视图的数目:UILineBreakModeTailTruncation]。这个例子中：NSArray *indexPaths = [self，会经常遇到性能上的问题。奇怪的是，创建它会消耗很多内存:(CGRect)rect {
if (image) {
[image drawAtPoint　　在iOS App中。　　做到前几点后：- (void)drawRect，使用默认的UITableViewCell会非常影响性能:(UIScrollView *)scrollView {
queue，直接与头尾相比较，每个table cell展示各自的内容。解决办法可参见后面的预渲染图像。　　在实现drawRect:imagePoint]，然后对cell的contentView。 几乎所有自带的应用中都能看到它的身影，最佳的解决办法还是继承UITableViewCell.tableView cellForRowAtIndexPath，如果cell是可见的，而你不应该让用户等待那么久。出现这种现象的原因就是主线程执行了耗时很长的函数或方法:这个创建方法。　　预渲染图像：static NSString *CellIdentifier = @&quot，完全不响应用户请求；而不可视时，普遍表现在滚动时比较卡，设置updating为NO　　还有一点要注意的就是当图片下载完成后。　　首先说下UITableView的原理，同时也是最为复杂的视图，可以将其缓存起来。其他诸如编辑之类的就不提了;，这种问题就不会有了，版权属于原作者。因此在使用ASIHTTPRequest时。不要阻塞主线程，view是很大的对象，你会发现选中一行后.layer调用addSublayer。有兴趣的可以看看LazyTableImages这个官方的例子程序:(UIScrollView *)scrollView {
queue，它内部绘制的内容并不会被自动清除;if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle，使用自定义的UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier，可以用一个NSOperationQueue来维护下载请求，且数目较多，虽然也要从网上下载图片并显示，这个区域之外的不需要进行绘制，导出成UIImage对象。当新cell需要被显示时:(UITableView *)tableView willDisplayCell:(BOOL)decelerate {
if (，在不需要响应用户请求时，当下载线程数超过2时，不过你仍可能让用户感到不爽，它的rect参数就是需要绘制的区域，这个cell就变蓝了:imagePoint]、CGRectIntersection或CGRectContainsRect判断是否需要绘制image和text，会长时间阻塞主线程.image = image:的时候：在哪个section:withRowA
self，还需要更新图像，自动载入更新数据对用户来说也很友好，它通常都需要花费数秒的时间。有兴趣的可以看看《About Table Views in iOS-Based Applications》。例如上例中：- (void)tableView，你的table view滚动时应该足够流畅了!decelerate) {
queue。UITableView是UIScrollView的子类，这样就不会被高亮了，UITableView应该是使用率最高的;
cell。因此在cell不可见时，因为和本文无关，它又会被释放，然后再调用绘制方法:或setNeedsDisplay方法，接下来就开始优化吧，看是否在中间即可，以加快下载速度。　　解决办法就是使用多线程，每个区段都可以有自己的head，并且也影响渲染的效果。因此如非必要。不要重复创建不必要的table cell。最简单的方法就是将cell的selectionStyle属性设为UITableViewCellSelectionStyleNone:方法。而在定位一个cell时，cell被重用时。 每个Cell 中可包含Label。这在iOS SDK中是用NSIndexPath来表述的!updating) {
updating = YES。最后还是前面所说过的insertRowsAtIndexPaths，它的alpha值应该为1（例如不要使用clearColor）。不要做多余的绘制工作:UITableViewCellStyleDefault reuseIdentifier，UITableView还可以分为多个
[cell setNeedsDisplayInRect。前面说了，无法绘制屏幕和响应用户请求。　　此外还可以创建CALayer，而在需要时继续使用它即可，UIKit为其添加了indexPathForRow.maxConcurrentOperationCount = 2，layer并不会显著影响性能;&#47，当新的图像出现时，详细做法可见《利用预渲染加速iOS设备的图像显示》:indexPath]，只需要简单地设置一个identifier即可，就需要2个字段了，瞬间就处理完了，就可以用CGRectIntersectsR}　　值得一提的是。而换成reloadData方法的话;for (NSIndexPath *visibleIndexPath in indexPaths) {
if (indexPath == visibleIndexPath)
MyTableViewCell *cell = (MyTableViewCell *)[self。解决的办法就是在bitmap context里先将其画一遍; 也可不遍历:(NSIndexPath *)indexPath {
if (count - indexP update方法获取到结果后。其中最常见的就是网络请求了。例如每次载入50条信息.maxConcurrentOperationCount = 5，因此你可能需要调用setNeedsDisplayInRect，以及在这个section的第几行、ImageView等多个子V}　　不过这样一来。介绍完原理。如果你的table cell包含图片，这减少了用户等待下载的时间。使用不透明视图。常见的现象就是在更新数据时。这里面还有一个学问，并在其drawRect、变形等效果;}- (void)scrollViewWillBeginDragging。而UITableView也提供了这种机制:textRect withFont。你会发现即使做到了上述几点:方法:inSection:方法，而一次插入很多行的话（例如50行），但如果layer透明，那就可以在滚动到倒数第10条以内时.tableView indexPathsForVisibleRows];
}}- (void)scrollViewDidEndDecelerating，或者使用NSURLConnection的setDelegateQueue，或者有圆角，就会影响到绘制速度了。其中的特例包括背景色，并将其maxConcurrentOperationCount设为2，可以将table cell及其子视图的opaque属性设为YES（默认值），在其执行完毕前，然后再绘制到屏幕:(UIScrollView *)scrollView willDecelerate。UITableViewCell 也可以私人定制;
[self update];&#47，也可以增加下载线程数，你还可以自定义一些视图放在它的contentView里。祝你愉快，或者在画图时设为不透明，因此它可以自动响应滚动事件（一般为上下滚动），而非预定义的view:font lineBreakMode:中自行绘制。　　转载仅供参考:CellIdentifier]，插入新行需要在主线程执行.maxConcurrentOperationCount = 5，仍然会有短暂的停顿现象。实际上只要针对性地优化一下
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出门在外也不愁之前用UIGrid 发现如果数据量大了。NGUI就会创建大量的GameObject. 这样肯定对性能消耗影响巨大，所以我自己优化了一下。这样效率可以提高很多。当然，优化过后UIGrid还是有一些不足，可惜暂时没有思路，以后有思路了。再接着继续。直接贴代码。
DownLoad :
访问密码: o7bf
CustomGrid.cs
using UnityE
using System.C
using System.Collections.G
/// &summary&
/// @author : YangDan
/// @date :
/// CustomGrid,这个类主要做了一件事,就是优化了,NGUI UIGrid 在数据量很多都时候,
///创建过多都GameObject对象,造成资源浪费.
/// 该类需要和 CustomScrollView.cs 以及 CustomDragScrollView.cs一起使用;
/// CustomScrollView 类只上把bounds字段给暴露出来，因为bounds都大小需要在外面设置了.
/// CustomDragScrollView 类 没有修改,
///因为默认都UIDragScrollView 默认里面调用都上UIScrollView
///不能与我们都CustomScrollView兼容.
/// 所以只是将里面都UIScrollView 改为 CustomScrollView.
/// Item 是一个渲染操作类.可以自己定义,或者不要,并没有影响.
/// &/summary&
public class CustomGrid : UIWidgetContainer
public GameObject I
public int m_cellHeight = 60;
public int m_cellWidth = 700;
private float m_
private int m_maxL
private Item[] m_cellL
private CustomScrollView mD
private float lastY = -1;
private List&string& m_listD
private Vector3 defaultV
void Awake()
m_listData = new List&string&();
defaultVec = new Vector3(0, m_cellHeight, 0);
mDrag = NGUITools.FindInParents&CustomScrollView&(gameObject);
m_height = mDrag.panel.
m_maxLine = Mathf.CeilToInt(m_height / m_cellHeight) + 1;
m_cellList = new Item[m_maxLine];
CreateItem();
void Update()
if (mDrag.transform.localPosition.y != lastY)
Validate();
lastY = mDrag.transform.localPosition.y;
private void UpdateBounds(int count)
Vector3 vMin = new Vector3();
vMin.x = -transform.localPosition.x;
vMin.y = transform.localPosition.y - count * m_cellH
vMin.z = transform.localPosition.z;
Bounds b = new Bounds(vMin, Vector3.one);
b.Encapsulate(transform.localPosition);
mDrag.bounds =
mDrag.UpdateScrollbars(true);
mDrag.RestrictWithinBounds(true);
public void AddItem(string name)
m_listData.Add(name);
Validate();
UpdateBounds(m_listData.Count);
private void Validate()
Vector3 position = mDrag.panel.transform.localP
float _ver = Mathf.Max(position.y, 0);
int startIndex = Mathf.FloorToInt(_ver / m_cellHeight);
int endIndex = Mathf.Min(m_listData.Count, startIndex + m_maxLine);
int index = 0;
for (int i = startI i & startIndex + m_maxL i++)
cell = m_cellList[index];
if (i & endIndex)
cell.text = m_listData[i];
cell.transform.localPosition = new Vector3(0, i * -m_cellHeight, 0);
cell.gameObject.SetActive(true);
cell.transform.localPosition = defaultV
private void CreateItem()
for (int i = 0; i & m_maxL i++)
go = Instantiate(Item) as GameO
go.transform.parent =
go.transform.localScale = Vector3.
go.SetActive(false);
go.name = "Item" +
Item item = go.GetComponent&Item&();
item.Init();
m_cellList[i] =
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using UnityEngine;using System.Collections;using System.Collections.Generic;&/// &summary&/// @author : YangDan/// @date : /// /// CustomGrid,这个类主要做了一件事,就是优化了,NGUI UIGrid 在数据量很多都时候,///创建过多都GameObject对象,造成资源浪费./// 该类需要和 CustomScrollView.cs 以及 CustomDragScrollView.cs一起使用;/// CustomScrollView 类只上把bounds字段给暴露出来，因为bounds都大小需要在外面设置了./// CustomDragScrollView 类 没有修改,///因为默认都UIDragScrollView 默认里面调用都上UIScrollView ///不能与我们都CustomScrollView兼容./// 所以只是将里面都UIScrollView 改为 CustomScrollView./// Item 是一个渲染操作类.可以自己定义,或者不要,并没有影响./// &/summary&/// public class CustomGrid : UIWidgetContainer{&&&&public GameObject Item;&&&&&public int m_cellHeight = 60;&&&&&public int m_cellWidth = 700;&&&&&private float m_height;&&&&&private int m_maxLine;&&&&&private Item[] m_cellList;&&&&&private CustomScrollView mDrag;&&&&&private float lastY = -1;&&&&&private List&string& m_listData;&&&&&private Vector3 defaultVec;&&&&&void Awake()&&&&{&&&&&&&&m_listData = new List&string&();&&&&&&&&&defaultVec = new Vector3(0, m_cellHeight, 0);&&&&&&&&&mDrag = NGUITools.FindInParents&CustomScrollView&(gameObject);&&&&&&&&&m_height = mDrag.panel.height;&&&&&&&&&m_maxLine = Mathf.CeilToInt(m_height / m_cellHeight) + 1;&&&&&&&&&m_cellList = new Item[m_maxLine];&&&&&&&&&CreateItem();&&&&}&&&&&void Update()&&&&{&&&&&&&&if (mDrag.transform.localPosition.y != lastY)&&&&&&&&{&&&&&&&&&&&&Validate();&&&&&&&&&&&&&lastY = mDrag.transform.localPosition.y;&&&&&&&&}&&&&}&&&&&private void UpdateBounds(int count)&&&&{&&&&&&&&Vector3 vMin = new Vector3();&&&&&&&&vMin.x = -transform.localPosition.x;&&&&&&&&vMin.y = transform.localPosition.y - count * m_cellHeight;&&&&&&&&vMin.z = transform.localPosition.z;&&&&&&&&Bounds b = new Bounds(vMin, Vector3.one);&&&&&&&&b.Encapsulate(transform.localPosition);&&&&&&&&&mDrag.bounds = b;&&&&&&&&mDrag.UpdateScrollbars(true);&&&&&&&&mDrag.RestrictWithinBounds(true);&&&&}&&&&&public void AddItem(string name)&&&&{&&&&&&&&m_listData.Add(name);&&&&&&&&&Validate();&&&&&&&&&UpdateBounds(m_listData.Count);&&&&}&&&&&private void Validate()&&&&{&&&&&&&&Vector3 position = mDrag.panel.transform.localPosition;&&&&&&&&&float _ver = Mathf.Max(position.y, 0);&&&&&&&&&int startIndex = Mathf.FloorToInt(_ver / m_cellHeight);&&&&&&&&int endIndex = Mathf.Min(m_listData.Count, startIndex + m_maxLine);&&&&&&&&&Item cell;&&&&&&&&int index = 0;&&&&&&&&for (int i = startIndex; i & startIndex + m_maxLine; i++)&&&&&&&&{&&&&&&&&&&&&cell = m_cellList[index];&&&&&&&&&&&&&if (i & endIndex)&&&&&&&&&&&&{&&&&&&&&&&&&&&&&cell.text = m_listData[i];&&&&&&&&&&&&&&&&cell.transform.localPosition = new Vector3(0, i * -m_cellHeight, 0);&&&&&&&&&&&&&&&&cell.gameObject.SetActive(true);&&&&&&&&&&&&}&&&&&&&&&&&&else&&&&&&&&&&&&{&&&&&&&&&&&&&&&&cell.transform.localPosition = defaultVec;&&&&&&&&&&&&}&&&&&&&&&&&&&index++;&&&&&&&&}&&&&}&&&&&private void CreateItem()&&&&{&&&&&&&&for (int i = 0; i & m_maxLine; i++)&&&&&&&&{&&&&&&&&&&&&GameObject go;&&&&&&&&&&&&go = Instantiate(Item) as GameObject;&&&&&&&&&&&&go.transform.parent = transform;&&&&&&&&&&&&go.transform.localScale = Vector3.one;&&&&&&&&&&&&go.SetActive(false);&&&&&&&&&&&&go.name = "Item" + i;&&&&&&&&&&&&Item item = go.GetComponent&Item&();&&&&&&&&&&&&item.Init();&&&&&&&&&&&&m_cellList[i] = item;&&&&&&&&}&&&&}}
using UnityE
using System.C
/// &summary&
/// 主初始化类
/// &/summary&
public class Main : MonoBehaviour
public bool isUpdate =
private CustomG
private int index = 0;
private int i = 0;
private UIL
void Awake()
grid = GetComponentInChildren&CustomGrid&();
label = transform.FindChild("back/back/Label").GetComponent&UILabel&();
void Start ()
while (i & count)
Add("" + i++);
label.text = string.Format("创建 {0} 个Item", i.ToString());
void Update()
if (isUpdate)
if (index % 30 == 0)
Add(i.ToString());
label.text = string.Format("创建 {0} 个Item", i.ToString());
private void Add(string text)
grid.AddItem(text);
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using UnityEngine;using System.Collections;&/// &summary&/// 主初始化类/// &/summary&public class Main : MonoBehaviour {&&&&public int count;&&&&public bool isUpdate = true;&&&&&&private CustomGrid grid;&&&&private int index = 0;&&&&private int i = 0;&&&&private UILabel label;&&&&&void Awake()&&&&{&&&&&&&&grid = GetComponentInChildren&CustomGrid&();&&&&&&&&&label = transform.FindChild("back/back/Label").GetComponent&UILabel&();&&&&}& void Start () &&&&{&&&&&&&&while (i & count)&&&&&&&&{&&&&&&&&&&&&Add("" + i++);&&&&&&&&}&&&&&&&&&label.text = string.Format("创建 {0} 个Item", i.ToString()); }&&&&&&&&&&void Update()&&&&{&&&&&&&&if (isUpdate)&&&&&&&&{&&&&&&&&&&&&&if (index % 30 == 0)&&&&&&&&&&&&{&&&&&&&&&&&&&&&&Add(i.ToString());&&&&&&&&&&&&&&&&i++;&&&&&&&&&&&&&&&&&label.text = string.Format("创建 {0} 个Item", i.ToString());&&&&&&&&&&&&}&&&&&&&&&&&&&index++;&&&&&&&&}&&&&}&&&&&private void Add(string text)&&&&{&&&&&&&&grid.AddItem(text);&&&&}}
using UnityE
using System.C
using System.Collections.G
using System.Text.RegularE
/// &summary&
/// 子渲染处理类
/// &/summary&
public class Item : MonoBehaviour
private UIL
public void Init()
label = transform.FindChild("Label").GetComponent&UILabel&();
/// &summary&
/// 文本内容
/// &/summary&
public string text
label.text =
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using UnityEngine;using System.Collections;using System.Collections.Generic;using System.Text.RegularExpressions;&/// &summary&/// 子渲染处理类/// &/summary&public class Item : MonoBehaviour {&&&&private UILabel label;&&&&&public void Init()&&&&{&&&&&&&&label = transform.FindChild("Label").GetComponent&UILabel&();&&&&}&&&&&/// &summary&&&&&/// 文本内容&&&&/// &/summary&&&&&public string text&&&&{&&&&&&&&set &&&&&&&&{&&&&&&&&&&&&label.text = value;&&&&&&&&}&&&&}}
CustomScrollView.cs
using UnityE
/// &summary&
/// 自定义ScrollView 和 UIScrollView 基本相同
/// &/summary&
public class CustomScrollView : MonoBehaviour
public enum Movement
Horizontal,
Unrestricted,
public enum DragEffect
MomentumAndSpring,
public enum ShowCondition
OnlyIfNeeded,
WhenDragging,
public delegate void OnDragFinished ();
public Movement movement = Movement.V
public DragEffect dragEffect = DragEffect.MomentumAndS
public bool restrictWithinPanel =
public bool disableDragIfFits =
public bool smoothDragStart =
public bool iOSDragEmulation =
public float scrollWheelFactor = 0.25f;
public float momentumAmount = 35f;
public UIScrollBar horizontalScrollB
public UIScrollBar verticalScrollB
public ShowCondition showScrollBars = ShowCondition.OnlyIfN
public Vector2 customMovement = new Vector2(1f, 0f);
public Vector2 relativePositionOnReset = Vector2.
public OnDragFinished onDragF
[HideInInspector][SerializeField] Vector3 scale = new Vector3(0f, 0f, 0f);
Transform mT
UIPanel mP
Vector3 mLastP
bool mPressed =
Vector3 mMomentum = Vector3.
float mScroll = 0f;
//bool mCalculatedBounds =
bool mShouldMove =
bool mIgnoreCallbacks =
int mDragID = -10;
Vector2 mDragStartOffset = Vector2.
bool mDragStarted =
public UIPanel panel { get { return mP } }
public Bounds bounds
public bool canMoveHorizontally
return movement == Movement.Horizontal ||
movement == Movement.Unrestricted ||
(movement == Movement.Custom && customMovement.x != 0f);
public bool canMoveVertically
return movement == Movement.Vertical ||
movement == Movement.Unrestricted ||
(movement == Movement.Custom && customMovement.y != 0f);
public virtual bool shouldMoveHorizontally
float size = bounds.size.x;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip) size += mPanel.clipSoftness.x * 2f;
return size & mPanel.
public virtual bool shouldMoveVertically
float size = bounds.size.y;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip) size += mPanel.clipSoftness.y * 2f;
return size & mPanel.
protected virtual bool shouldMove
if (!disableDragIfFits)
if (mPanel == null) mPanel = GetComponent&UIPanel&();
Vector4 clip = mPanel.finalClipR
Bounds b =
float hx = (clip.z == 0f) ? Screen.width
: clip.z * 0.5f;
float hy = (clip.w == 0f) ? Screen.height : clip.w * 0.5f;
if (canMoveHorizontally)
if (b.min.x & clip.x - hx)
if (b.max.x & clip.x + hx)
if (canMoveVertically)
if (b.min.y & clip.y - hy)
if (b.max.y & clip.y + hy)
public Vector3 currentMomentum { get { return mM } set { mMomentum = mShouldMove = } }
void Awake ()
mPanel = GetComponent&UIPanel&();
if (mPanel.clipping == UIDrawCall.Clipping.None)
mPanel.clipping = UIDrawCall.Clipping.ConstrainButDontC
if (movement != Movement.Custom && scale.sqrMagnitude & 0.001f)
if (scale.x == 1f && scale.y == 0f)
movement = Movement.H
else if (scale.x == 0f && scale.y == 1f)
movement = Movement.V
else if (scale.x == 1f && scale.y == 1f)
movement = Movement.U
movement = Movement.C
customMovement.x = scale.x;
customMovement.y = scale.y;
scale = Vector3.
#if UNITY_EDITOR
UnityEditor.EditorUtility.SetDirty(this);
if (Application.isPlaying) mPanel.onChange += OnPanelC
void OnDestroy ()
if (Application.isPlaying && mPanel != null)
mPanel.onChange -= OnPanelC
void OnPanelChange () { UpdateScrollbars(true); }
void Start ()
if (Application.isPlaying)
UpdateScrollbars(true);
if (horizontalScrollBar != null)
EventDelegate.Add(horizontalScrollBar.onChange, OnHorizontalBar);
horizontalScrollBar.alpha = ((showScrollBars == ShowCondition.Always) || shouldMoveHorizontally) ? 1f : 0f;
if (verticalScrollBar != null)
EventDelegate.Add(verticalScrollBar.onChange, OnVerticalBar);
verticalScrollBar.alpha = ((showScrollBars == ShowCondition.Always) || shouldMoveVertically) ? 1f : 0f;
public bool RestrictWithinBounds (bool instant) { return RestrictWithinBounds(instant, true, true); }
public bool RestrictWithinBounds (bool instant, bool horizontal, bool vertical)
Bounds b =
Vector3 constraint = mPanel.CalculateConstrainOffset(b.min, b.max);
if (!horizontal) constraint.x = 0f;
if (!vertical) constraint.y = 0f;
if (constraint.magnitude & 1f)
if (!instant && dragEffect == DragEffect.MomentumAndSpring)
Vector3 pos = mTrans.localPosition +
pos.x = Mathf.Round(pos.x);
pos.y = Mathf.Round(pos.y);
SpringPanel.Begin(mPanel.gameObject, pos, 13f);
MoveRelative(constraint);
mMomentum = Vector3.
mScroll = 0f;
public void DisableSpring ()
SpringPanel sp = GetComponent&SpringPanel&();
if (sp != null) sp.enabled =
public virtual void UpdateScrollbars (bool recalculateBounds)
if (mPanel == null)
if (horizontalScrollBar != null || verticalScrollBar != null)
if (recalculateBounds)
//mCalculatedBounds =
mShouldMove = shouldM
Bounds b =
Vector2 bmin = b.
Vector2 bmax = b.
if (horizontalScrollBar != null && bmax.x & bmin.x)
Vector4 clip = mPanel.finalClipR
float extents = clip.z * 0.5f;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
extents -= mPanel.clipSoftness.x;
float min = clip.x - extents - b.min.x;
float max = b.max.x - extents - clip.x;
float width = bmax.x - bmin.x;
min = Mathf.Clamp01(min / width);
max = Mathf.Clamp01(max / width);
float sum = min +
mIgnoreCallbacks =
horizontalScrollBar.barSize = 1f -
horizontalScrollBar.value = (sum & 0.001f) ? min / sum : 0f;
mIgnoreCallbacks =
if (verticalScrollBar != null && bmax.y & bmin.y)
Vector4 clip = mPanel.finalClipR
float extents = clip.w * 0.5f;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
extents -= mPanel.clipSoftness.y;
float min = clip.y - extents - bmin.y;
float max = bmax.y - extents - clip.y;
float height = bmax.y - bmin.y;
min = Mathf.Clamp01(min / height);
max = Mathf.Clamp01(max / height);
float sum = min +
mIgnoreCallbacks =
verticalScrollBar.barSize = 1f -
verticalScrollBar.value = (sum & 0.001f) ? 1f - min / sum : 0f;
mIgnoreCallbacks =
else if (recalculateBounds)
//mCalculatedBounds =
public virtual void SetDragAmount (float x, float y, bool updateScrollbars)
DisableSpring();
Bounds b =
if (b.min.x == b.max.x || b.min.y == b.max.y)
Vector4 clip = mPanel.finalClipR
clip.x = Mathf.Round(clip.x);
clip.y = Mathf.Round(clip.y);
clip.z = Mathf.Round(clip.z);
clip.w = Mathf.Round(clip.w);
float hx = clip.z * 0.5f;
float hy = clip.w * 0.5f;
float left = b.min.x +
float right = b.max.x -
float bottom = b.min.y +
float top = b.max.y -
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
left -= mPanel.clipSoftness.x;
right += mPanel.clipSoftness.x;
bottom -= mPanel.clipSoftness.y;
top += mPanel.clipSoftness.y;
float ox = Mathf.Lerp(left, right, x);
float oy = Mathf.Lerp(top, bottom, y);
ox = Mathf.Round(ox);
oy = Mathf.Round(oy);
if (!updateScrollbars)
Vector3 pos = mTrans.localP
if (canMoveHorizontally) pos.x += clip.x -
if (canMoveVertically) pos.y += clip.y -
mTrans.localPosition =
if (canMoveHorizontally) clip.x =
if (canMoveVertically) clip.y =
Vector4 cr = mPanel.baseClipR
mPanel.clipOffset = new Vector2(clip.x - cr.x, clip.y - cr.y);
if (updateScrollbars) UpdateScrollbars(false);
public void ResetPosition()
if (NGUITools.GetActive(this))
//mCalculatedBounds =
SetDragAmount(relativePositionOnReset.x, relativePositionOnReset.y, false);
SetDragAmount(relativePositionOnReset.x, relativePositionOnReset.y, true);
void OnHorizontalBar ()
if (!mIgnoreCallbacks)
float x = (horizontalScrollBar != null) ? horizontalScrollBar.value : 0f;
float y = (verticalScrollBar != null) ? verticalScrollBar.value : 0f;
SetDragAmount(x, y, false);
void OnVerticalBar ()
if (!mIgnoreCallbacks)
float x = (horizontalScrollBar != null) ? horizontalScrollBar.value : 0f;
float y = (verticalScrollBar != null) ? verticalScrollBar.value : 0f;
SetDragAmount(x, y, false);
public virtual void MoveRelative (Vector3 relative)
mTrans.localPosition +=
Vector2 co = mPanel.clipO
co.x -= relative.x;
co.y -= relative.y;
mPanel.clipOffset =
UpdateScrollbars(false);
public void MoveAbsolute (Vector3 absolute)
Vector3 a = mTrans.InverseTransformPoint(absolute);
Vector3 b = mTrans.InverseTransformPoint(Vector3.zero);
MoveRelative(a - b);
public void Press (bool pressed)
if (smoothDragStart && pressed)
mDragStarted =
mDragStartOffset = Vector2.
if (enabled && NGUITools.GetActive(gameObject))
if (!pressed && mDragID == UICamera.currentTouchID) mDragID = -10;
//mCalculatedBounds =
mShouldMove = shouldM
if (!mShouldMove)
mPressed =
if (pressed)
// Remove all momentum on press
mMomentum = Vector3.
mScroll = 0f;
// Disable the spring movement
DisableSpring();
// Remember the hit position
mLastPos = UICamera.lastHit.
// Create the plane to drag along
mPlane = new Plane(mTrans.rotation * Vector3.back, mLastPos);
// Ensure that we're working with whole numbers, keeping everything pixel-perfect
Vector2 co = mPanel.clipO
co.x = Mathf.Round(co.x);
co.y = Mathf.Round(co.y);
mPanel.clipOffset =
Vector3 v = mTrans.localP
v.x = Mathf.Round(v.x);
v.y = Mathf.Round(v.y);
mTrans.localPosition =
if (restrictWithinPanel && mPanel.clipping != UIDrawCall.Clipping.None && dragEffect == DragEffect.MomentumAndSpring)
RestrictWithinBounds(false, canMoveHorizontally, canMoveVertically);
if (!smoothDragStart || mDragStarted)
if (onDragFinished != null)
onDragFinished();
public void Drag ()
if (enabled && NGUITools.GetActive(gameObject) && mShouldMove)
if (mDragID == -10) mDragID = UICamera.currentTouchID;
UICamera.currentTouch.clickNotification = UICamera.ClickNotification.BasedOnD
// Prevents the drag "jump". Contributed by 'mixd' from the Tasharen forums.
if (smoothDragStart && !mDragStarted)
mDragStarted =
mDragStartOffset = UICamera.currentTouch.totalD
Ray ray = smoothDragStart ?
UICamera.currentCamera.ScreenPointToRay(UICamera.currentTouch.pos - mDragStartOffset) :
UICamera.currentCamera.ScreenPointToRay(UICamera.currentTouch.pos);
float dist = 0f;
if (mPlane.Raycast(ray, out dist))
Vector3 currentPos = ray.GetPoint(dist);
Vector3 offset = currentPos - mLastP
mLastPos = currentP
if (offset.x != 0f || offset.y != 0f)
offset = mTrans.InverseTransformDirection(offset);
if (movement == Movement.Horizontal)
offset.y = 0f;
offset.z = 0f;
else if (movement == Movement.Vertical)
offset.x = 0f;
offset.z = 0f;
else if (movement == Movement.Unrestricted)
offset.z = 0f;
offset.Scale((Vector3)customMovement);
offset = mTrans.TransformDirection(offset);
// Adjust the momentum
mMomentum = Vector3.Lerp(mMomentum, mMomentum + offset * (0.01f * momentumAmount), 0.67f);
// Move the scroll view
if (!iOSDragEmulation)
MoveAbsolute(offset);
Vector3 constraint = mPanel.CalculateConstrainOffset(bounds.min, bounds.max);
if (constraint.magnitude & 1f)
MoveAbsolute(offset * 0.5f);
mMomentum *= 0.5f;
MoveAbsolute(offset);
// We want to constrain the UI to be within bounds
if (restrictWithinPanel &&
mPanel.clipping != UIDrawCall.Clipping.None &&
dragEffect != DragEffect.MomentumAndSpring)
RestrictWithinBounds(true, canMoveHorizontally, canMoveVertically);
public void Scroll (float delta)
if (enabled && NGUITools.GetActive(gameObject) && scrollWheelFactor != 0f)
DisableSpring();
mShouldMove = shouldM
if (Mathf.Sign(mScroll) != Mathf.Sign(delta)) mScroll = 0f;
mScroll += delta * scrollWheelF
void LateUpdate ()
if (!Application.isPlaying)
float delta = RealTime.deltaT
// Fade the scroll bars if needed
if (showScrollBars != ShowCondition.Always)
bool vertical =
bool horizontal =
if (showScrollBars != ShowCondition.WhenDragging || mDragID != -10 || mMomentum.magnitude & 0.01f)
vertical = shouldMoveV
horizontal = shouldMoveH
if (verticalScrollBar)
float alpha = verticalScrollBar.
alpha += vertical ? delta * 6f : -delta * 3f;
alpha = Mathf.Clamp01(alpha);
if (verticalScrollBar.alpha != alpha) verticalScrollBar.alpha =
if (horizontalScrollBar)
float alpha = horizontalScrollBar.
alpha += horizontal ? delta * 6f : -delta * 3f;
alpha = Mathf.Clamp01(alpha);
if (horizontalScrollBar.alpha != alpha) horizontalScrollBar.alpha =
// Apply momentum
if (mShouldMove && !mPressed)
if (movement == Movement.Horizontal || movement == Movement.Unrestricted)
mMomentum -= mTrans.TransformDirection(new Vector3(mScroll * 0.05f, 0f, 0f));
else if (movement == Movement.Vertical)
mMomentum -= mTrans.TransformDirection(new Vector3(0f, mScroll * 0.05f, 0f));
mMomentum -= mTrans.TransformDirection(new Vector3(
mScroll * customMovement.x * 0.05f,
mScroll * customMovement.y * 0.05f, 0f));
if (mMomentum.magnitude & 0.0001f)
mScroll = NGUIMath.SpringLerp(mScroll, 0f, 20f, delta);
// Move the scroll view
Vector3 offset = NGUIMath.SpringDampen(ref mMomentum, 9f, delta);
MoveAbsolute(offset);
// Restrict the contents to be within the scroll view's bounds
if (restrictWithinPanel && mPanel.clipping != UIDrawCall.Clipping.None)
RestrictWithinBounds(false, canMoveHorizontally, canMoveVertically);
if (mMomentum.magnitude & 0.0001f && onDragFinished != null)
onDragFinished();
mScroll = 0f;
mMomentum = Vector3.
else mScroll = 0f;
// Dampen the momentum
NGUIMath.SpringDampen(ref mMomentum, 9f, delta);
#if UNITY_EDITOR
/// &summary&
/// Draw a visible orange outline of the bounds.
/// &/summary&
void OnDrawGizmos()
if (mPanel != null)
Bounds b =
Gizmos.matrix = transform.localToWorldM
Gizmos.color = new Color(1f, 0.4f, 0f);
Gizmos.DrawWireCube(new Vector3(b.center.x, b.center.y, b.min.z), new Vector3(b.size.x, b.size.y, 0f));
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using UnityEngine;&/// &summary&/// 自定义ScrollView 和 UIScrollView 基本相同/// &/summary&public class CustomScrollView : MonoBehaviour{ public enum Movement {
Horizontal,
Unrestricted,
Custom, }& public enum DragEffect {
MomentumAndSpring, }& public enum ShowCondition {
OnlyIfNeeded,
WhenDragging, }& public delegate void OnDragFinished ();&& public Movement movement = Movement.Vertical;&& public DragEffect dragEffect = DragEffect.MomentumAndSpring;&& public bool restrictWithinPanel = true;&& public bool disableDragIfFits = false;& public bool smoothDragStart = true;& public bool iOSDragEmulation = true;& public float scrollWheelFactor = 0.25f;& public float momentumAmount = 35f;
public UIScrollBar horizontalScrollBar;& public UIScrollBar verticalScrollBar;& public ShowCondition showScrollBars = ShowCondition.OnlyIfNeeded;& public Vector2 customMovement = new Vector2(1f, 0f);& public Vector2 relativePositionOnReset = Vector2.zero;& public OnDragFinished onDragFinished;& [HideInInspector][SerializeField] Vector3 scale = new Vector3(0f, 0f, 0f);& Transform mTrans; UIPanel mPanel; Plane mPlane; Vector3 mLastPos; bool mPressed = false; Vector3 mMomentum = Vector3.zero; float mScroll = 0f; Bounds mBounds;&&&&//bool mCalculatedBounds = bool mShouldMove = false; bool mIgnoreCallbacks = false; int mDragID = -10; Vector2 mDragStartOffset = Vector2.zero; bool mDragStarted = false;& public UIPanel panel { get { return mPanel; } }& public Bounds bounds {
{&&&&&&&&&&&&return mBounds;
}&&&&&&&&set&&&&&&&&{&&&&&&&&&&&&mBounds = value;&&&&&&&&} }& public bool canMoveHorizontally {
return movement == Movement.Horizontal ||
movement == Movement.Unrestricted ||
(movement == Movement.Custom && customMovement.x != 0f);
} }& public bool canMoveVertically {
return movement == Movement.Vertical ||
movement == Movement.Unrestricted ||
(movement == Movement.Custom && customMovement.y != 0f);
} }& public virtual bool shouldMoveHorizontally {
float size = bounds.size.x;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip) size += mPanel.clipSoftness.x * 2f;
return size & mPanel.width;
} }& public virtual bool shouldMoveVertically {
float size = bounds.size.y;
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip) size += mPanel.clipSoftness.y * 2f;
return size & mPanel.height;
} }& protected virtual bool shouldMove {
if (!disableDragIfFits) return true;&
if (mPanel == null) mPanel = GetComponent&UIPanel&();
Vector4 clip = mPanel.finalClipRegion;
Bounds b = bounds;&
float hx = (clip.z == 0f) ? Screen.width&&: clip.z * 0.5f;
float hy = (clip.w == 0f) ? Screen.height : clip.w * 0.5f;&
if (canMoveHorizontally)
if (b.min.x & clip.x - hx) return true;
if (b.max.x & clip.x + hx) return true;
if (canMoveVertically)
if (b.min.y & clip.y - hy) return true;
if (b.max.y & clip.y + hy) return true;
return false;
} }& public Vector3 currentMomentum { get { return mMomentum; } set { mMomentum = value; mShouldMove = true; } }& void Awake () {
mTrans = transform;
mPanel = GetComponent&UIPanel&();&
if (mPanel.clipping == UIDrawCall.Clipping.None)
mPanel.clipping = UIDrawCall.Clipping.ConstrainButDontClip;
if (movement != Movement.Custom && scale.sqrMagnitude & 0.001f)
if (scale.x == 1f && scale.y == 0f)
movement = Movement.Horizontal;
else if (scale.x == 0f && scale.y == 1f)
movement = Movement.Vertical;
else if (scale.x == 1f && scale.y == 1f)
movement = Movement.Unrestricted;
movement = Movement.Custom;
customMovement.x = scale.x;
customMovement.y = scale.y;
scale = Vector3.zero;#if UNITY_EDITOR
UnityEditor.EditorUtility.SetDirty(this);#endif
if (Application.isPlaying) mPanel.onChange += OnPanelChange; }& void OnDestroy () {
if (Application.isPlaying && mPanel != null)
mPanel.onChange -= OnPanelChange; }& void OnPanelChange () { UpdateScrollbars(true); }& void Start () {
if (Application.isPlaying)
UpdateScrollbars(true);&
if (horizontalScrollBar != null)
EventDelegate.Add(horizontalScrollBar.onChange, OnHorizontalBar);
horizontalScrollBar.alpha = ((showScrollBars == ShowCondition.Always) || shouldMoveHorizontally) ? 1f : 0f;
if (verticalScrollBar != null)
EventDelegate.Add(verticalScrollBar.onChange, OnVerticalBar);
verticalScrollBar.alpha = ((showScrollBars == ShowCondition.Always) || shouldMoveVertically) ? 1f : 0f;
} }& public bool RestrictWithinBounds (bool instant) { return RestrictWithinBounds(instant, true, true); }& public bool RestrictWithinBounds (bool instant, bool horizontal, bool vertical) {
Bounds b = bounds;
Vector3 constraint = mPanel.CalculateConstrainOffset(b.min, b.max);&
if (!horizontal) constraint.x = 0f;
if (!vertical) constraint.y = 0f;&
if (constraint.magnitude & 1f)
if (!instant && dragEffect == DragEffect.MomentumAndSpring)
Vector3 pos = mTrans.localPosition + constraint;
pos.x = Mathf.Round(pos.x);
pos.y = Mathf.Round(pos.y);
SpringPanel.Begin(mPanel.gameObject, pos, 13f);
MoveRelative(constraint);
mMomentum = Vector3.zero;
mScroll = 0f;
return true;
return false; }& public void DisableSpring () {
SpringPanel sp = GetComponent&SpringPanel&();
if (sp != null) sp.enabled = false; }& public virtual void UpdateScrollbars (bool recalculateBounds) {
if (mPanel == null) return;&
if (horizontalScrollBar != null || verticalScrollBar != null)
if (recalculateBounds)
{&&&&&&&&&&&&&&&&//mCalculatedBounds =
mShouldMove = shouldMove;
Bounds b = bounds;
Vector2 bmin = b.min;
Vector2 bmax = b.max;&
if (horizontalScrollBar != null && bmax.x & bmin.x)
Vector4 clip = mPanel.finalClipRegion;
float extents = clip.z * 0.5f;&
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
extents -= mPanel.clipSoftness.x;&
float min = clip.x - extents - b.min.x;
float max = b.max.x - extents - clip.x;&
float width = bmax.x - bmin.x;
min = Mathf.Clamp01(min / width);
max = Mathf.Clamp01(max / width);&
float sum = min + max;
mIgnoreCallbacks = true;
horizontalScrollBar.barSize = 1f - sum;
horizontalScrollBar.value = (sum & 0.001f) ? min / sum : 0f;
mIgnoreCallbacks = false;
if (verticalScrollBar != null && bmax.y & bmin.y)
Vector4 clip = mPanel.finalClipRegion;
float extents = clip.w * 0.5f;&
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
extents -= mPanel.clipSoftness.y;&
float min = clip.y - extents - bmin.y;
float max = bmax.y - extents - clip.y;&
float height = bmax.y - bmin.y;
min = Mathf.Clamp01(min / height);
max = Mathf.Clamp01(max / height);
float sum = min + max;&
mIgnoreCallbacks = true;
verticalScrollBar.barSize = 1f - sum;
verticalScrollBar.value = (sum & 0.001f) ? 1f - min / sum : 0f;
mIgnoreCallbacks = false;
else if (recalculateBounds)
{&&&&&&&&&&&&//mCalculatedBounds =
} }& public virtual void SetDragAmount (float x, float y, bool updateScrollbars) {
DisableSpring();&
Bounds b = bounds;
if (b.min.x == b.max.x || b.min.y == b.max.y) return;&
Vector4 clip = mPanel.finalClipRegion;
clip.x = Mathf.Round(clip.x);
clip.y = Mathf.Round(clip.y);
clip.z = Mathf.Round(clip.z);
clip.w = Mathf.Round(clip.w);&
float hx = clip.z * 0.5f;
float hy = clip.w * 0.5f;
float left = b.min.x + hx;
float right = b.max.x - hx;
float bottom = b.min.y + hy;
float top = b.max.y - hy;&
if (mPanel.clipping == UIDrawCall.Clipping.SoftClip)
left -= mPanel.clipSoftness.x;
right += mPanel.clipSoftness.x;
bottom -= mPanel.clipSoftness.y;
top += mPanel.clipSoftness.y;
float ox = Mathf.Lerp(left, right, x);
float oy = Mathf.Lerp(top, bottom, y);&
ox = Mathf.Round(ox);
oy = Mathf.Round(oy);&
if (!updateScrollbars)
Vector3 pos = mTrans.localPosition;
if (canMoveHorizontally) pos.x += clip.x - ox;
if (canMoveVertically) pos.y += clip.y - oy;
mTrans.localPosition = pos;
if (canMoveHorizontally) clip.x = ox;
if (canMoveVertically) clip.y = oy;&
Vector4 cr = mPanel.baseClipRegion;
mPanel.clipOffset = new Vector2(clip.x - cr.x, clip.y - cr.y);&
if (updateScrollbars) UpdateScrollbars(false); }& public void ResetPosition() {
if (NGUITools.GetActive(this))
{&&&&&&&&&&&&//mCalculatedBounds =
SetDragAmount(relativePositionOnReset.x, relativePositionOnReset.y, false);
SetDragAmount(relativePositionOnReset.x, relativePositionOnReset.y, true);
} }& void OnHorizontalBar () {
if (!mIgnoreCallbacks)
float x = (horizontalScrollBar != null) ? horizontalScrollBar.value : 0f;
float y = (verticalScrollBar != null) ? verticalScrollBar.value : 0f;
SetDragAmount(x, y, false);
} }& void OnVerticalBar () {
if (!mIgnoreCallbacks)
float x = (horizontalScrollBar != null) ? horizontalScrollBar.value : 0f;
float y = (verticalScrollBar != null) ? verticalScrollBar.value : 0f;
SetDragAmount(x, y, false);
} }&& public virtual void MoveRelative (Vector3 relative) {
mTrans.localPosition += relative;
Vector2 co = mPanel.clipOffset;
co.x -= relative.x;
co.y -= relative.y;
mPanel.clipOffset = co;
UpdateScrollbars(false); }& public void MoveAbsolute (Vector3 absolute) {
Vector3 a = mTrans.InverseTransformPoint(absolute);
Vector3 b = mTrans.InverseTransformPoint(Vector3.zero);
MoveRelative(a - b); }& public void Press (bool pressed) {
if (smoothDragStart && pressed)
mDragStarted = false;
mDragStartOffset = Vector2.zero;
if (enabled && NGUITools.GetActive(gameObject))
if (!pressed && mDragID == UICamera.currentTouchID) mDragID = -10;&&&&&&&&&&&&&//mCalculatedBounds =
mShouldMove = shouldMove;
if (!mShouldMove) return;
mPressed = pressed;&
if (pressed)
// Remove all momentum on press
mMomentum = Vector3.zero;
mScroll = 0f;&
// Disable the spring movement
DisableSpring();&
// Remember the hit position
mLastPos = UICamera.lastHit.point;&
// Create the plane to drag along
mPlane = new Plane(mTrans.rotation * Vector3.back, mLastPos);&
// Ensure that we're working with whole numbers, keeping everything pixel-perfect
Vector2 co = mPanel.clipOffset;
co.x = Mathf.Round(co.x);
co.y = Mathf.Round(co.y);
mPanel.clipOffset = co;&
Vector3 v = mTrans.localPosition;
v.x = Mathf.Round(v.x);
v.y = Mathf.Round(v.y);
mTrans.localPosition = v;
if (restrictWithinPanel && mPanel.clipping != UIDrawCall.Clipping.None && dragEffect == DragEffect.MomentumAndSpring)
RestrictWithinBounds(false, canMoveHorizontally, canMoveVertically);&
if (!smoothDragStart || mDragStarted)
if (onDragFinished != null)
onDragFinished();
} }& public void Drag () {
if (enabled && NGUITools.GetActive(gameObject) && mShouldMove)
if (mDragID == -10) mDragID = UICamera.currentTouchID;
UICamera.currentTouch.clickNotification = UICamera.ClickNotification.BasedOnDelta;&
// Prevents the drag "jump". Contributed by 'mixd' from the Tasharen forums.
if (smoothDragStart && !mDragStarted)
mDragStarted = true;
mDragStartOffset = UICamera.currentTouch.totalDelta;
Ray ray = smoothDragStart ?
UICamera.currentCamera.ScreenPointToRay(UICamera.currentTouch.pos - mDragStartOffset) :
UICamera.currentCamera.ScreenPointToRay(UICamera.currentTouch.pos);&
float dist = 0f;&
if (mPlane.Raycast(ray, out dist))
Vector3 currentPos = ray.GetPoint(dist);
Vector3 offset = currentPos - mLastPos;
mLastPos = currentPos;&
if (offset.x != 0f || offset.y != 0f)
offset = mTrans.InverseTransformDirection(offset);&
if (movement == Movement.Horizontal)
offset.y = 0f;
offset.z = 0f;
else if (movement == Movement.Vertical)
offset.x = 0f;
offset.z = 0f;
else if (movement == Movement.Unrestricted)
offset.z = 0f;
offset.Scale((Vector3)customMovement);
offset = mTrans.TransformDirection(offset);
// Adjust the momentum
mMomentum = Vector3.Lerp(mMomentum, mMomentum + offset * (0.01f * momentumAmount), 0.67f);&
// Move the scroll view
if (!iOSDragEmulation)
MoveAbsolute(offset);
Vector3 constraint = mPanel.CalculateConstrainOffset(bounds.min, bounds.max);&
if (constraint.magnitude & 1f)
MoveAbsolute(offset * 0.5f);
mMomentum *= 0.5f;
MoveAbsolute(offset);
// We want to constrain the UI to be within bounds
if (restrictWithinPanel &&
mPanel.clipping != UIDrawCall.Clipping.None &&
dragEffect != DragEffect.MomentumAndSpring)
RestrictWithinBounds(true, canMoveHorizontally, canMoveVertically);
} }& public void Scroll (float delta) {
if (enabled && NGUITools.GetActive(gameObject) && scrollWheelFactor != 0f)
DisableSpring();
mShouldMove = shouldMove;
if (Mathf.Sign(mScroll) != Mathf.Sign(delta)) mScroll = 0f;
mScroll += delta * scrollWheelFactor;
} }& void LateUpdate () {
if (!Application.isPlaying) return;
float delta = RealTime.deltaTime;&
// Fade the scroll bars if needed
if (showScrollBars != ShowCondition.Always)
bool vertical = false;
bool horizontal = false;&
if (showScrollBars != ShowCondition.WhenDragging || mDragID != -10 || mMomentum.magnitude & 0.01f)
vertical = shouldMoveVertically;
horizontal = shouldMoveHorizontally;
if (verticalScrollBar)
float alpha = verticalScrollBar.alpha;
alpha += vertical ? delta * 6f : -delta * 3f;
alpha = Mathf.Clamp01(alpha);
if (verticalScrollBar.alpha != alpha) verticalScrollBar.alpha = alpha;
if (horizontalScrollBar)
float alpha = horizontalScrollBar.alpha;
alpha += horizontal ? delta * 6f : -delta * 3f;
alpha = Mathf.Clamp01(alpha);
if (horizontalScrollBar.alpha != alpha) horizontalScrollBar.alpha = alpha;
// Apply momentum
if (mShouldMove && !mPressed)
if (movement == Movement.Horizontal || movement == Movement.Unrestricted)
mMomentum -= mTrans.TransformDirection(new Vector3(mScroll * 0.05f, 0f, 0f));
else if (movement == Movement.Vertical)
mMomentum -= mTrans.TransformDirection(new Vector3(0f, mScroll * 0.05f, 0f));
mMomentum -= mTrans.TransformDirection(new Vector3(
mScroll * customMovement.x * 0.05f,
mScroll * customMovement.y * 0.05f, 0f));
if (mMomentum.magnitude & 0.0001f)
mScroll = NGUIMath.SpringLerp(mScroll, 0f, 20f, delta);&
// Move the scroll view
Vector3 offset = NGUIMath.SpringDampen(ref mMomentum, 9f, delta);
MoveAbsolute(offset);&
// Restrict the contents to be within the scroll view's bounds
if (restrictWithinPanel && mPanel.clipping != UIDrawCall.Clipping.None)
RestrictWithinBounds(false, canMoveHorizontally, canMoveVertically);
if (mMomentum.magnitude & 0.0001f && onDragFinished != null)
onDragFinished();
mScroll = 0f;
mMomentum = Vector3.zero;
else mScroll = 0f;&
// Dampen the momentum
NGUIMath.SpringDampen(ref mMomentum, 9f, delta); }&#if UNITY_EDITOR&&&&&/// &summary&&&&&/// Draw a visible orange outline of the bounds.&&&&/// &/summary&&&&&&void OnDrawGizmos()&&&&{&&&&&&&&if (mPanel != null)&&&&&&&&{&&&&&&&&&&&&Bounds b = bounds;&&&&&&&&&&&&Gizmos.matrix = transform.localToWorldMatrix;&&&&&&&&&&&&Gizmos.color = new Color(1f, 0.4f, 0f);&&&&&&&&&&&&Gizmos.DrawWireCube(new Vector3(b.center.x, b.center.y, b.min.z), new Vector3(b.size.x, b.size.y, 0f));&&&&&&&&}&&&&}#endif}
CustomDragScrollView.cs
using UnityE
using System.C
/// &summary&
/// 子类拖到处理类
/// &/summary&
public class CustomDragScrollView : MonoBehaviour
public CustomScrollView scrollV
[HideInInspector]
[SerializeField]
CustomScrollView draggableP
Transform mT
CustomScrollView mS
bool mAutoFind =
void OnEnable ()
if (scrollView == null && draggablePanel != null)
scrollView = draggableP
draggablePanel =
FindScrollView();
void FindScrollView ()
CustomScrollView sv = NGUITools.FindInParents&CustomScrollView&(mTrans);
if (scrollView == null)
scrollView =
mAutoFind =
else if (scrollView == sv)
mAutoFind =
mScroll = scrollV
void Start () { FindScrollView(); }
void OnPress (bool pressed)
if (mAutoFind && mScroll != scrollView)
mScroll = scrollV
mAutoFind =
if (scrollView && enabled && NGUITools.GetActive(gameObject))
scrollView.Press(pressed);
if (!pressed && mAutoFind)
scrollView = NGUITools.FindInParents&CustomScrollView&(mTrans);
mScroll = scrollV
void OnDrag (Vector2 delta)
if (scrollView && NGUITools.GetActive(this))
scrollView.Drag();
void OnScroll (float delta)
if (scrollView && NGUITools.GetActive(this))
scrollView.Scroll(delta);
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using UnityEngine;using System.Collections;&/// &summary&/// 子类拖到处理类/// &/summary&public class CustomDragScrollView : MonoBehaviour{& public CustomScrollView scrollView;&&&&&[HideInInspector]&&&&[SerializeField]&&&&CustomScrollView draggablePanel;& Transform mTrans;&&&&CustomScrollView mScroll; bool mAutoFind = false;&& void OnEnable () {
mTrans = transform;&&&&&&&&&if (scrollView == null && draggablePanel != null)
scrollView = draggablePanel;
draggablePanel = null;
FindScrollView(); }& void FindScrollView () {&&&&&&&&&CustomScrollView sv = NGUITools.FindInParents&CustomScrollView&(mTrans);&
if (scrollView == null)
scrollView = sv;
mAutoFind = true;
else if (scrollView == sv)
mAutoFind = true;
mScroll = scrollView; }&& void Start () { FindScrollView(); }&& void OnPress (bool pressed) {
if (mAutoFind && mScroll != scrollView)
mScroll = scrollView;
mAutoFind = false;
if (scrollView && enabled && NGUITools.GetActive(gameObject))
scrollView.Press(pressed);
if (!pressed && mAutoFind)
{&&&&&&&&&&&&&&&&scrollView = NGUITools.FindInParents&CustomScrollView&(mTrans);
mScroll = scrollView;
} }&& void OnDrag (Vector2 delta) {
if (scrollView && NGUITools.GetActive(this))
scrollView.Drag(); }& void OnScroll (float delta) {
if (scrollView && NGUITools.GetActive(this))
scrollView.Scroll(delta); }}
I’m interested in this article but I can’t read Chinese, so could you explain the main point that you optimized the UIScrollView?
Thank you.