ios 查看旋转通知：为什么 didRotateFromInterfaceOrientation: 没有被调用？

View rotation notifications: why didRotateFromInterfaceOrientation: doesn't get called?

提问by Francesco Puglisi

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

我正在尝试检测任何设备方向的变化，以便我可以更新视图。

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

无论方向是纵向还是横向，我都想更新视图，所以我实现了这个方法：

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

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:

我知道如果我想更新视图以正确显示当前方向，我需要实现以下一些方法：

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

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

现在，问题是我不明白为什么当我旋转模拟器时这些方法都没有被触发。

I tried as well this piece of code:

我也试过这段代码：

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

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

但还是什么都没有。所以我想知道，模拟器是否会触发轮换通知？如果是，我做错了什么？

采纳答案by Francesco Puglisi

Quick summary,change this:

快速总结，改变这个：

[window addSubview:viewController.view];

to this:

对此：

[window setRootViewController:viewController];

---

---

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:

如果我因为我的一个愚蠢的错误而耽误了别人的时间，我很抱歉。我发现了为什么该方法– willRotateToInterfaceOrientation:duration:永远不会被调用。有些东西让我注意到了导航控制器：

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

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

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

我在另一个论坛中找到了这些帖子，并查看了应用程序委托。我的代码如下：

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];

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:

问题是我没有为窗口设置任何视图控制器，而只是添加了一个视图。由于急于测试某些东西，我犯了一个错误。我不得不像这样修复代码：

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];

回答by Alkimake

You need to add notification observer something like

您需要添加通知观察者之类的

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];

and add the method

并添加方法

- (void) didRotate:(NSNotification *)notification
{   
      UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

       if (orientation == UIDeviceOrientationLandscapeLeft)
      {
        NSLog(@"Landscape Left!");
      }
}