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:@"" forKey:@"orientation"];
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