UIScrollView contentOffset在推送另一个视图之后更改 [英] UIScrollView contentOffset change after another view pushed

问题描述

我在Interface Builder中有一个 UIViewController ，并且在中添加了一个 UIScrollView UIView 。它具有等于0.0的 contentOffset 属性，但是当我将 UIScrollView 滚动到底部并推动另一个视图 contentOffset 更改。

NSLog ：

  //查看刚刚加载的
 2013-09-09 16：19：27.455 my_app [24588：907]滚动视图内容偏移量为0.000000 
 
 //我们从另一个视图返回
 2013-09-09 16：19：30.957 my_app [24588：907]滚动视图内容偏移量为108.000000 
  

这种行为的原因是什么？我刚刚在IB中添加了一个 UIScrollView ，在代码中什么也没做。

scrollView的 contentHeight 大于 self.view.height 。

解决方案

请参阅我的回答类似的问题。

您需要设置scrollview的 viewWillAppear：和 viewWillDisappear：适当地在 contentOffset p>

另请参阅：

• 此回答问题 UIScrollView的原点在弹回到UIViewController后发生变化。


• 这个相关的问题， UIScrollview自动展示问题。

I have a UIViewController in Interface Builder, and I add a UIScrollView to the UIView. It has a contentOffset property equal to 0.0, but when I scroll the UIScrollView to the very bottom and push another view the contentOffset changes.

NSLog gives me the following values:

//View just loaded
2013-09-09 16:19:27.455 my_app[24588:907] Scroll View content offset is 0.000000

//We came back from another view
2013-09-09 16:19:30.957 my_app[24588:907] Scroll View content offset is 108.000000

What's the reason of this behaviour? I've just added a UIScrollView in IB and did nothing in code at all.

The contentHeight of the scrollView is bigger than self.view.height. The frame of the scrollView stays the same.

解决方案

See my answer to a similar question.

You need to set the scrollview's contentOffset appropriately in viewWillAppear: and viewWillDisappear:.

Also, see this:

• This answer to the question UIScrollView's origin changes after popping back to the UIViewController.
• This related question, UIScrollview Autolayout Issue.

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