添加视图控制器的视图作为子视图会改变它的框架吗？
SomeViewController *someVC = [[SomeViewController alloc] initWithNibName:@"SomeViewController" bundle:nil];
self.someViewController = someVC;
[someVC release];
NSLog(@"height before added as subview: %f", self.someViewController.view.frame.size.height);
[self.containerView addSubview:self.someViewController.view];
NSLog(@"height AFTER added as subview: %f", self.someViewController.view.frame.size.height);
// height before added as subview: 480.000000
// height AFTER added as subview: 540.000000
这有什么可能的解释呢？ someViewController 的视图没有设置任何自动调整大小属性，并且 containerView 不会自动调整其子视图的大小。仅将其添加为子视图会导致框架发生变化？
另一个谜团是，只有当 someViewController 的视图高度 >= 480 时，才会发生这种情况。
SomeViewController *someVC = [[SomeViewController alloc] initWithNibName:@"SomeViewController" bundle:nil];
self.someViewController = someVC;
[someVC release];
NSLog(@"height before added as subview: %f", self.someViewController.view.frame.size.height);
[self.containerView addSubview:self.someViewController.view];
NSLog(@"height AFTER added as subview: %f", self.someViewController.view.frame.size.height);
// height before added as subview: 480.000000
// height AFTER added as subview: 540.000000
What possible explanation is there for this? someViewController's view does not have any autoresizing properties set, and containerView does not autoresize it's subviews. What could cause the frame to change by just adding it as a subview?
A further mystery to this is that it only happens when someViewController's view height is >= 480.
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SomeViewController是什么类型的视图控制器？我认为可能发生的一件事是SomeViewController可能包含一些额外的内容，例如UINavigationController的顶部栏，并且有时会自动增加大小。但是您所做的是将一个视图控制器的视图添加到另一个视图控制器，从而违反了 HIG。UIViewController被设计为屏幕的完整视图或属于专用视图控制器，例如UITabBarController、UINavigationController或UISplitViewController。因此，someViewController将无法按预期运行，也不会接收诸如viewDidLoad之类的调用。因此，如果您确定没有设置自动调整大小属性，我可以建议使用UIView而不是UIViewController。What kind of view controller is
SomeViewController? The one thing I think that may be happening isSomeViewControllermay contain some extra content such as the top bar of anUINavigationControllerand that is automatically increasing the size sometimes. But what you are doing is violating the HIG by adding the view of one view controller to another view controller. AnUIViewControlleris designed to be the full view of the screen or belonging to a specialized view controller such as anUITabBarController,UINavigationController, orUISplitViewController. As a resultsomeViewControllerwill not function as expected and not receive calls such asviewDidLoad. So if you are sure that no autoresizing properties are set all I can recommend is using anUIViewinstead of anUIViewController.这可能是由视图的 autoresizingMask 引起的，它的目的是调整大小以适应其超级视图的变化。
This can be caused by the autoresizingMask of the view, it's purpose is to adjust the size to changes in it's super view.