查看轮换通知：为什么didRotateFromInterfaceOrientation：没有被调用？ [英] View rotation notifications: why didRotateFromInterfaceOrientation: doesn't get called?

问题描述

我正在尝试检测任何设备方向更改，以便我可以更新视图。

I'm trying to detect any device orientation change so that I can update the views.

我想更新视图，无论方向是纵向还是横向，所以我实现了这个方法：

I want to update the views whether the orientation is portrait or landscape, so I implemented this method:

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationLandscapeRight || interfaceOrientation == UIInterfaceOrientationLandscapeLeft);
}

我知道如果我想更新视图以正确显示当前视图方向，我将需要实现以下一些方法：

I know that if I want to update the views to show properly for the current orientation, I will need to implement some of the following methods:

– willRotateToInterfaceOrientation:duration:
– willAnimateRotationToInterfaceOrientation:duration:
– didRotateFromInterfaceOrientation:
– willAnimateFirstHalfOfRotationToInterfaceOrientation:duration:
– didAnimateFirstHalfOfRotationToInterfaceOrientation:
– willAnimateSecondHalfOfRotationFromInterfaceOrientation:duration:

现在，问题是我不明白为什么在旋转模拟器时没有这些方法被触发。

Now, the problem is that I don't understand why none of these methods get fired when I rotate the simulator.

我也试过这段代码：

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

但仍然没有。所以我想知道，模拟器是否会触发旋转通知？
如果是，我做错了什么？

But still nothing. So I'm wondering, does the simulator fire rotation notifications? If yes, what am I doing wrong?

推荐答案

快速摘要，更改此信息：

[window addSubview:viewController.view];

到此：

[window setRootViewController:viewController];

---

如果我花了点时间，我很抱歉我的一个愚蠢的错误。我发现为什么方法 - willRotateToInterfaceOrientation：duration：永远不会被调用。有些东西把我的注意力集中在导航控制器上：

---

I'm sorry if I took somebody's time for a silly mistake of mine. I found out why the method – willRotateToInterfaceOrientation:duration: would never get called. Something brought my attention to the navigation controller:

只调用根视图控制器的willRotate方法。很可能你有一个奇怪的视图控制器层次结构。

Only the root view controller's willRotate method is being called. Most likely you have a strange hierarchy of view controllers.

我在另一个论坛发现了这些帖子，我看了一下app delegate 。我的代码如下：

I found these post in another forum and I had a look at the app delegate. My code was as follows:

CGRect bound = [[UIScreen mainScreen] bounds];
window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, bound.size.width, bound.size.height)];
TestViewController *viewController = [[TestViewController alloc] init];
[window addSubview:viewController.view];
[viewController release];
[self.window makeKeyAndVisible];

问题是我没有为窗口设置任何视图控制器，但我只是添加了一个视图。由于急于测试，我做错了。我必须修复这样的代码：

The problem was that I was not setting any view controller for the window, but I was just adding a view. It was a mistake I did due to the hurry to test something. I had to fix the code like this:

CGRect bound = [[UIScreen mainScreen] bounds];
window = [[UIWindow alloc] initWithFrame:CGRectMake(0, 0, bound.size.width, bound.size.height)];
TestViewController *viewController = [[TestViewController alloc] init];
[window setRootViewController:viewController];
[viewController release];
[self.window makeKeyAndVisible];

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