关于UIInterfaceOritation 和 UIDeviceOritation

来源：互联网发布：php文件管理系统编辑：程序博客网时间：2024/06/04 00:24

原文链接:http://blog.163.com/hongbin89@126/blog/static/112853955201331432531787/

1、UIDeviceOrientation是设备的方向，只能读取不能设置,支持6个方向，

typedef NS_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

};

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

typedef NS_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

 [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[notificationCenter addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object: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];

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