- 监听设备旋转方向 通过设备单例实现
设备方向是根据Home键确定的
必须先开始生成设备旋转方向的通知 然后监听通知 才可以处理设备的旋转
//开启设备方向通知
if !UIDevice.current.isGeneratingDeviceOrientationNotifications {
UIDevice.current.beginGeneratingDeviceOrientationNotifications()
}
//注册通知
NotificationCenter.default.addObserver(self, selector: #selector(handleDeviceOrientationChange(notification:)), name: .UIDeviceOrientationDidChange, object: nil)
func handleDeviceOrientationChange(notification:NSNotification) -> Void {
//获取设备方向
//this will return UIDeviceOrientationUnknown unless device orientation notifications are being generated.
let currentOri = UIDevice.current.orientation
switch currentOri {
case .faceUp:
print("faceUp");
case .faceDown:
print("faceDown")
case .landscapeLeft:
print("landsapeLeft")
case .landscapeRight:
print("landscapeRight")
case .portrait:
print("portraint")
case .portraitUpsideDown:
print("portraintUpsideDown")
case .unknown:
print("unknown")
}
}
//移除通知
deinit {
//取消监听
NotificationCenter.default.removeObserver(self)
//关闭设备方向通知
UIDevice.current.endGeneratingDeviceOrientationNotifications()
}
- 监听屏幕旋转方向，
如果要改变界面UI的话，大多情况这个更有用，因为如果设备发生旋转，但屏幕并未旋转就会出问题。
屏幕方向是根据状态栏来判断的
// 用户界面方向是参考状态栏方向的UIApplication.shared.statusBarOrientation
// 注册通知
NotificationCenter.default.addObserver(self, selector: #selector(handleStatusBarOrientationChange(notification:)), name: NSNotification.Name.UIApplicationDidChangeStatusBarOrientation, object: nil)
}
func handleStatusBarOrientationChange(notification:NSNotification) -> Void {
let interfaceor = UIApplication.shared.statusBarOrientation
switch interfaceor {
case .portrait:
print("portrait")
case .portraitUpsideDown:
print("portraintUpsideDown")
case .landscapeLeft:
print("landsacpeLeft")
case .landscapeRight:
print("landscapeRight")
case .unknown:
print("unknown")
}
}
控制器中常用的控制界面方向的方法
// 是否支持旋转
override var shouldAutorotate: Bool{
return true
}
// 屏幕支持的旋转方向 UIInterfaceOrientation.portrait 表示仅支持竖直方向
override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
return UIInterfaceOrientationMask.all
}
// 由模态推出的视图控制器 优先支持的屏幕方向
override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation{
return UIInterfaceOrientation.portrait
}
