弹回 UIViewController 后 UIScrollView 的原点发生变化

问题描述

我有一个 UIViewController 子类作为情节提要中的场景，其中包含一个包含各种子视图的 UIScrollView.其中一个子视图是一个 UIButton ，它进入另一个场景 UIViewController 子类.当我从视图返回时(将 UIViewController 从导航控制器堆栈中弹出)，我发现滚动视图的原点发生了某种变化，尽管 contentsize 和 contentoffset 看起来是正确的.

I have a UIViewController subclass as a scene in the storyboard that contains a UIScrollView containing various subviews. One of the subviews is a UIButton which segues into another scene UIViewController subclass. When I come back from the view (pop the UIViewController off the navigation controller stack), I find that the scroll view's origin has somehow changed, although the contentsize and contentoffset seem correct.

另外有趣的是，该应用程序有一个标签栏，当我离开并返回该视图时，滚动视图被正确设置为偏移量为 (0, 0).

What's also interesting is that the app has a tab bar, and when I tab away and back to that view, the scroll view is set back correctly with offset at (0, 0).

这个过程基本上不涉及任何代码，因为它几乎都在情节提要中.由于我对使用情节提要相当陌生，因此我认为我做错了，尽管我不知道是什么.关于那可能是什么的任何想法?也许是规模问题或限制?

There is basically no code involved in this process, as it's pretty much all in the storyboard. As I am fairly new to using the storyboard, I figure I'm doing something wrong, although I don't know what. Any ideas as to what that may be? Perhaps sizing issues or constraints?

推荐答案

其实我把那行代码放在viewDidDisappear中，为了让view重新出现时记住偏移量，我加了这个前一行

Actually, I put that line of code in viewDidDisappear, and so that it remembers the offset when the view reappears, I added this line before it

 self.contentOffset = self.scrollView.contentOffset;

还有

 - (void)viewDidLayoutSubviews { 
       self.scrollView.contentOffset = self.contentOffset; 
 }