iOS手机屏幕朝向和简单的获取屏幕方向的方法

1、对于iOS手机屏幕，苹果公司给出了一个枚举。

如： typedef NS_ENUM (NSInteger, UIDeviceOrientation) {

    UIDeviceOrientationUnknown,

    UIDeviceOrientationPortrait,            // 竖向，home键向下

    UIDeviceOrientationPortraitUpsideDown,  //  竖向，home键向上

    UIDeviceOrientationLandscapeLeft,       // 横 向，home键向右

    UIDeviceOrientationLandscapeRight,      //  横 向，home键向左

    UIDeviceOrientationFaceUp,              // 屏幕平放，向上

    UIDeviceOrientationFaceDown             // 屏幕平放，向下

}

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {

    UIInterfaceOrientationUnknown            = UIDeviceOrientationUnknown,

    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,

    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,

    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,

    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft

}

2、对于获取手机屏幕

（1）  [[ UIDevice currentDevice ] beginGeneratingDeviceOrientationNotifications ];

    dispatch_async ( dispatch_get_main_queue (), ^{

        NSLog ( @"=========%zd" ,[[ UIDevice currentDevice ] orientation ]);

    });

    [[ UIDevice currentDevice ] endGeneratingDeviceOrientationNotifications ];

（2） UIInterfaceOrientation orientation = [ UIApplication sharedApplication ]. statusBarOrientation ;

3、对于当前手机是不是横屏或者竖屏的判断

（1）判断是否是竖屏

static inline BOOL UIDeviceOrientationIsPortrait( UIDeviceOrientation orientation) {

    return ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown );

}

（2）判断是否是横屏

static inline BOOL UIDeviceOrientationIsLandscape( UIDeviceOrientation orientation) {

    return ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight );

}