手动检测旋转到横向 [英] Detecting rotation to landscape manually

问题描述

我正在为每个页面开发基于UITabBarController和UIViewControllers的iPhone应用程序。应用程序只需要以纵向模式运行，因此每个视图控制器+应用程序委托都使用以下代码行：

I am working on an iPhone application based on UITabBarController and UIViewControllers for each page. The app needs to run in portrait mode only, so every view controller + app delegate goes with this line of code:

- (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation {
 return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

我想在一个视图控制器中弹出一个UIImageView iPhone被转向了landscapeleft。虽然宽度和高度都是320x460（因此它的肖像），但图像的设计看起来很有风景。

There is one view controller where I would like to pop up a UIImageView when the iPhone is rotaed to landscapeleft. The design of the image looks landscape, although the width and height are 320x460 ( so its portrait ).

我怎样才能/应该手动检测这种类型的旋转这个特定的视图控制器，在整个视图中没有自动旋转？

How can/should I detect this type of rotation manually, just in this specific view controller, withouth having an auto rotation on the entire view?

Thomas

更新：

谢谢！

我在viewDidLoad中添加了这个监听器：

I added this listener in the viewDidLoad:

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

didRotate看起来像这样：

the didRotate looks like this:

- (void) didRotate:(NSNotification *)notification

    {   
        UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

        if (orientation == UIDeviceOrientationLandscapeLeft)
        {
            //your code here

        }
    }

推荐答案

我在一个旧项目中需要它 - 希望它仍然可以...

I needed that in an old project - hope it still works...

1）注册通知：

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(detectOrientation)
                                             name:UIDeviceOrientationDidChangeNotification
                                           object:nil]; 

2）然后你可以测试改变时的轮换：

2) Then you can test against the rotation on change:

-(void) detectOrientation {
    if (([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft) || 
        ([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight)) {
        [self doLandscapeThings];
    } else if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown) {
        [self doPortraitThings];
    }   
}

希望有所帮助！

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