设置横竖频 设备方向 软件方向

[UIDevice currentDevice].orientation == UIDeviceOrientationPortrait

获取设备的方向方法

1、UIDeviceOrientation是设备的方向，只能读取不能设置,

typedefNS_ENUM(NSInteger,UIDeviceOrientation){
    UIDeviceOrientationUnknown,
    UIDeviceOrientationPortrait,                        // Device oriented vertically, home button on the bottom
    UIDeviceOrientationPortraitUpsideDown,       // Device oriented vertically, home button on the top
    UIDeviceOrientationLandscapeLeft,              // Device oriented horizontally, home button on the right
    UIDeviceOrientationLandscapeRight,           // Device oriented horizontally, home button on the left
    UIDeviceOrientationFaceUp,                        // Device oriented flat, face up
    UIDeviceOrientationFaceDown                    // Device oriented flat, face down
};

[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait];

设置软件方向

2UIInterfaceOrientation是软件的方向，可以读取可以设置。

typedefNS_ENUM(NSInteger,UIInterfaceOrientation){
    UIInterfaceOrientationPortrait           =UIDeviceOrientationPortrait,
    UIInterfaceOrientationPortraitUpsideDown=UIDeviceOrientationPortraitUpsideDown,
    UIInterfaceOrientationLandscapeLeft      =UIDeviceOrientationLandscapeRight,
    UIInterfaceOrientationLandscapeRight     =UIDeviceOrientationLandscapeLeft
};

注意：UIInterfaceOrientation的横屏的左边和右边跟UIDeviceOrientation刚好相反。

2、如果需要获取设备方向变化（UIDeviceOrientation）的消息的话，需要注册UIDeviceOrientationDidChangeNotification通知。

在注册通知时，需要先调用UIDevice的beginGeneratingDeviceOrientationNotifications方法

[[UIDevicecurrentDevice]beginGeneratingDeviceOrientationNotifications];
[notificationCenter addObserver:selfselector:@selector(deviceOrientationDidChange)name:UIDeviceOrientationDidChangeNotificationobject:nil];

同时，在结束时，需要移除改通知消息

[notificationCenter removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];