如何处理UIViewController的旋转，该rotoiewontroller在uinavigationController堆栈中没有? [英] How to handle rotation for a UIViewController that isnt on top of UINavigationController stack?

问题描述

我有一个根的UIViewController(VC1)，一个UINavigationController，它处理通过手动调节其意见/子视图帧在willRotateToInterfaceOrientation轮换内:方法.旋转工作正常，如果根的UIViewController是活动视图控制器，基本上在堆栈的顶部.

I have a root UIViewController (VC1), inside a UINavigationController, which handles rotation by adjusting its views/subviews frames manually in the willRotateToInterfaceOrientation: method. The rotation works fine if the root UIViewController is the active view controller, basically on top of the stack.

当我推另一个的UIViewController(VC2)，会出现问题到NavigationController.我再旋转VC2工作正常.然而，当我弹出VC2问题是，VC1为非旋转到正确的方向，也没有其willRotateToInterfaceOrientation:方法被调用?该shouldAutorotateToInterfaceOrientation:方法在VC1被称为但是那它

The problem occurs when i push another UIViewController (VC2) onto the NavigationController. I then rotate VC2 which works fine. However when i pop VC2 the problem is that VC1 has not rotated to the correct orientation, nor does its willRotateToInterfaceOrientation: method get called?? The shouldAutorotateToInterfaceOrientation: method in VC1 is called but thats it.

我的问题然后才是我应该如何确保我的UIViewController VC1已经为当前方向更新的这种情况?

My question then is how am i supposed to make sure that my UIViewController VC1 has been updated for the current orientation for this type of situation??

推荐答案

我解决这个问题的方法是检查<代码> viewWillAppear中:以查看是否取向现在是不同的时<代码> viewDidDisappear 被调用.如果是这样我所说的代码来布局视图.

The way I resolve this is to check on viewWillAppear: to see if the orientation is now different to when viewDidDisappear was called. If so I call the code to layout the view.

要采用这种方法的第一因素负责布置视图成类似<代码> _layoutViews 的代码，可以简单地将其称为在<代码> viewWillAppear中以及在<代码所需> willRotateToInterfaceOrientation:

To adopt this approach first factor the code responsible for laying out the view into something like _layoutViews, can simply call it as required in viewWillAppear as well as in willRotateToInterfaceOrientation:.

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