iOS 横竖屏监听通知

iOS横竖屏通知有两种，一种监听设备横竖屏状态，另一种监听状态栏横竖屏状态。与布局有关一般使用第二种，因为如果一个viewcontroller不支持自动旋转，当设备由竖屏转横屏时依然会执行监听设备横竖屏的通知方法。

1.监听设备横竖屏

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientChange:) name:UIDeviceOrientationDidChangeNotification object:nil];

- (void)orientChange:(NSNotification *)notification

UIDeviceOrientation  orient = [UIDevice currentDevice].orientation;

4种状态：

UIDeviceOrientationPortrait

UIDeviceOrientationPortraitUpsideDown

UIDeviceOrientationLandscapeLeft

UIDeviceOrientationLandscapeRight

2.监听状态栏横竖屏状态

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientChange:) name:UIApplicationDidChangeStatusBarOrientationNotification object:nil];

- (void)orientChange:(NSNotification *)notification

UIInterfaceOrientation interfaceOritation = [[UIApplication sharedApplication] statusBarOrientation];

4种状态：

UIInterfaceOrientationUnknown            = UIDeviceOrientationUnknown,

UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,

UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,

UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,

UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft