addSubview修改添加的视图的框架 [英] addSubview modifying the added view's frame

问题描述

我不知道如何提出这个问题，但在这里...

我将一个PDF页面转换成一个视图，并将它添加到一个UIViewController 。工作正常，除了一些PDF文件。

由于某些原因，代码通过不同的路径为某些PDF文件。当从PowerPoint创建PDF时发生。在调用addSubview之后，它将通过一个更改PDF视图框架的路径。我为PDFViewController.view.frame添加了一个观察者，并且跟踪是：

  0  -  [PDFViewController observeValueForKeyPath：ofObject：change：context ：] 
 1 NSKVONotify 
 2  -  [NSKeyValueObservance observeValueForKeyPath：ofObject：change：context：] 
 3 NSKVONotify 
 4  -  [NSObject（NSKeyValueObserverNotification）didChangeValueForKey：] 
 5 _NSSetRectValueAndNotify 
 6  -  [UIViewController viewDidMoveToWindow：shouldAppearOrDisappear：] 
 7  -  [UIView（Internal）_didMoveFromWindow：toWindow：] 
 8  -  [UIView（Hierarchy）_postMovedFromSuperview：] 
 9  - [UIView（Internal）_addSubview：positional：relativeTo：] 
 10  -  [UIView（Hierarchy）addSubview：] 
 11（预期的其余轨迹）
  / pre> 
 
 
对于大多数PDF文件，这个工作正常。但对于一些，添加的视图的框架被修改在 [UIViewController viewDidMoveToWindow：shouldAppearOrDisappear：] 。原点的y坐标向下移动43像素，高度减少约20％。我找不到任何关于该方法内发生的信息，它似乎是UIViewController的内部。
 
 
 
任何人都知道为什么帧被修改？至少在正确的方向轻推？
 
 
 
提前感谢。
 
 
 
编辑：
 
 
 
现在我很确定它是 [UIViewController viewDidMoveToWindow：shouldAppearOrDisappear：] 正在拧紧它。我在PDFViewController中实现了一个空的 -viewDidMoveToWindow：（UIWindow *）shouldAppearOrDisappear：（BOOL）标志方法，错误消失了。但这只是不是一个修复，而是可能导致一个被拒绝的应用程序。 >。
 
 
 
有任何建议/意见的人吗？
解决方案
 43px是导航栏的大小。你有吗？
 
I'm not sure how to ask this question, but here goes...

I am rendering a PDF page into a view and adding it to a UIViewController. Works fine, except for some PDF files. 

For some reason, the code goes through a different path for certain PDF files. It happens when the PDF is created from PowerPoint. After the addSubview call, it goes through a path that alters the PDF view's frame. I added an observer for PDFViewController.view.frame and the trace goes:
0 -[PDFViewController observeValueForKeyPath:ofObject:change:context:]
1 NSKVONotify
2 -[NSKeyValueObservance observeValueForKeyPath:ofObject:change:context:]
3 NSKVONotify
4 -[NSObject(NSKeyValueObserverNotification) didChangeValueForKey:]
5 _NSSetRectValueAndNotify
6 -[UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]
7 -[UIView(Internal) _didMoveFromWindow:toWindow:]
8 -[UIView(Hierarchy) _postMovedFromSuperview:]
9 -[UIView(Internal) _addSubview:positioned:relativeTo:]
10 -[UIView(Hierarchy) addSubview:]
11 (rest of trace is expected)
For most PDF files, this works ok. But for some, the added view's frame gets modified somewhere in [UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]. The y coordinate of the origin moves down by 43 pixels and the height is decreased by around 20%. I can't find any information about what happens inside that method, it appears to be internal to UIViewController.

Anyone have any idea why the frame is being modified? At least a nudge in the right direction?

Thanks in advance.

EDIT:

Now I'm pretty sure that it is [UIViewController viewDidMoveToWindow:shouldAppearOrDisappear:]that is screwing it up. I implemented an empty -viewDidMoveToWindow:(UIWindow *)shouldAppearOrDisappear:(BOOL)flag method in PDFViewController and the bug went away. But this just doesn't look like a fix, but instead may lead to a rejected app. >.<

Anyone with any suggestions/comments?
解决方案
43px is size of navigationbar. Do you have it?

                        
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