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通过UIDevice.currentDevice()来获取设备，可以取得设备当前的方向。
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import UIKitclass 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" } }} |
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原文地址：http://www.cnblogs.com/Free-Thinker/p/4843551.html
