swift - swift 中的 shouldAutorotateToInterfaceOrientation

Question

我是 Swift 的新手。我想检测设备是否正在旋转(纵向或横向)。当然，我在 Swift 中需要它。 objective-c 代码:

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

-(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];
    }   
} 

谢谢。

Answer 1

要检测旋转，您可以实现这两种方法:

    override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {

    }

    override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) {

    }

将代码翻译成 swift 是您必须亲自尝试的事情，只要您具备 swift 的基本知识，这应该不是问题。如果您有具体问题，您可以随时将它们发布到 SO 上，但我们无法为您做功课:-)

(提示:这是您的一行代码:

if UIDevice.currentDevice().orientation == .LandscapeLeft {

}

)