有时候,我们处理自动布局时,需要获取到屏幕旋转方向:
以下为本人亲测:
UIInterfaceOrientation:
我们需要在- (void)viewDidLoad或其他方法中添加观察者,检测屏幕的旋转:
// 监听状态栏旋转方向,即屏幕旋转 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangeStatusBarOrientationNotification:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];
然后实现方法:
// 监听的是StatusBar - (void)willChangeStatusBarOrientationNotification:(NSNotification *)notification { // 此处我们只介绍常用的三种横竖屏 UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; if (orientation == UIInterfaceOrientationPortrait) { // 竖屏 NSLog(@"竖屏"); } if (orientation == UIInterfaceOrientationLandscapeRight) {// 横屏(Home键在右边) NSLog(@"横屏(Home键在右边"); } if (orientation == UIInterfaceOrientationLandscapeLeft) { // 横屏(Home键在左边) NSLog(@"横屏(Home键在左边)"); } }
此处需要说明一下:屏幕的旋转,枚举值里面的 right/left 是以Home方法为准的!和设备旋转是相反的!
UIDeviceOrientation:
同样的,我们需要注册设备旋转的观察者:
// 设置旋转 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didChangeNotification:) name:UIDeviceOrientationDidChangeNotification object:nil];
实现通知方法:
- (void)didChangeNotification:(NSNotification *)noti { UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation; switch (deviceOrientation) { case UIDeviceOrientationPortrait: NSLog(@"竖屏"); break; case UIDeviceOrientationLandscapeLeft: NSLog(@"横屏(Home在右边,设备向左边倒)"); break; case UIDeviceOrientationLandscapeRight: NSLog(@"横屏(Home在左边,设备向右边倒)"); break; case UIDeviceOrientationPortraitUpsideDown: NSLog(@"横屏(Home在右边,设备向左边倒)"); break; case UIDeviceOrientationFaceUp: NSLog(@"屏幕向上"); break; case UIDeviceOrientationFaceDown: NSLog(@"屏幕向下"); break; default: break; } }
注:设备旋转时,枚举值里面的方法,指的是设备倒向的方法。
小技巧:
1.获取屏幕当前状态栏旋转方法
- (UIInterfaceOrientation)appInterface { return [UIApplication sharedApplication].statusBarOrientation; }
2.强制屏幕做出旋转
// 2对应相应的枚举值 [[UIDevice currentDevice] setValue:@"2" forKey:@"orientation"];
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