1.判斷設備傾斜角度

coreMotionMgr = CMMotionManager()
coreMotionMgr!.deviceMotionUpdateInterval = 0.01
let queue = NSOperationQueue()
coreMotionMgr!.startDeviceMotionUpdatesUsingReferenceFrame(.XArbitraryZVertical, toQueue: queue) { (motion, nil) in 
    NSOperationQueue.mainQueue().addOperationWithBlock({ 
    let angle = atan2(motion!.gravity.y, motion!.gravity.x)
    let angleDegrees = angle * 180.0 / M_PI
       print("\(Int(angleDegrees)) 度")  // - 135 向左傾斜45度  －45 向右傾斜45度 向右放平是0度
     })
    }

2.監(jiān)聽設備旋轉

 override func viewDidLoad() {
       super.viewDidLoad()
       UIDevice.currentDevice().beginGeneratingDeviceOrientationNotifications()
       NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(handleDeviceOrientationDidChange), name: UIDeviceOrientationDidChangeNotification, object: nil)
 }

   // MARK: 監(jiān)聽設備旋轉
   func handleDeviceOrientationDidChange() {
       let device = UIDevice.currentDevice()
       switch device.orientation {
       case .LandscapeLeft:
       case .LandscapeRight:
       case .Portrait:
       case .FaceDown:
       case .FaceUp: //...Unknown PortraitUpsideDown
       default: break
       }
   }

3.強制橫屏

  override func shouldAutorotate() -> Bool {
       return false
  }
    
  override func preferredInterfaceOrientationForPresentation() -> UIInterfaceOrientation {
     return UIInterfaceOrientation.LandscapeRight
  }