Swift

import UIKit

 

class ViewController: UIViewController {

     

    @IBOutlet weak var orientationLabel: UILabel!

     

    override func viewDidLoad() {

        super.viewDidLoad()

        

        //感知设备方向 - 开启监听设备方向

        UIDevice.currentDevice().beginGeneratingDeviceOrientationNotifications()

        //添加通知，监听设备方向改变

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "receivedRotation",

            name: UIDeviceOrientationDidChangeNotification, object: nil)

         

        //关闭设备监听

        //UIDevice.currentDevice().endGeneratingDeviceOrientationNotifications()

    }

     

    //通知监听触发的方法

    func receivedRotation(){

        var device = UIDevice.currentDevice()

        switch device.orientation{

            case .Portrait:

                orientationLabel.text = "面向设备保持垂直，Home键位于下部"

            case .PortraitUpsideDown:

                orientationLabel.text = "面向设备保持垂直，Home键位于上部"

            case .LandscapeLeft:

                orientationLabel.text = "面向设备保持水平，Home键位于左侧"

            case .LandscapeRight:

                orientationLabel.text = "面向设备保持水平，Home键位于右侧"

            case .FaceUp:

                orientationLabel.text = "设备平放，Home键朝上"

            case .FaceDown:

                orientationLabel.text = "设备平放，Home键朝下"

            case .Unknown:

                orientationLabel.text = "方向未知"

            default:

                orientationLabel.text = "方向未知"

        }

    }

}