iOS屏幕旋转的处理

设置通知监听屏幕的旋转（在旋转的瞬间触发该方法）

首先我们需要先注册一个UIApplicationDidChangeStatusBarOrientationNotification通知

NSNotificationCenter.defaultCenter().addObserver(self, selector: "statusBarOrientationChange:", name: UIApplicationDidChangeStatusBarOrientationNotification, object: nil)

当触发屏幕旋转旋转事件的时候，就会执行我们的方法：

func statusBarOrientationChange(notification: NSNotification) {

        let orientation = UIApplication.sharedApplication().statusBarOrientation
        if (orientation == UIInterfaceOrientation.LandscapeRight) {
            
            print("home键靠右")
        }
        
        if (orientation == UIInterfaceOrientation.LandscapeLeft) {
            
            print("home键靠左")
        }
        
        if (orientation == UIInterfaceOrientation.Portrait) {
            
            print("home键向下（默认情况）")
        }
        
        if (orientation == UIInterfaceOrientation.PortraitUpsideDown) {
            
            print("home键向上")
        }
}

如果想要在旋转完成后执行某些操作的话，需要重写如下方法：

override func didRotateFromInterfaceOrientation(fromInterfaceOrientation: UIInterfaceOrientation) {
        //你的处理逻辑         
}