UIDeviceOrientation 和 UIInterfaceOrientation 设备旋转的用法 (实例)
UIDeviceOrientation 是机器硬件的当前旋转方向 这个你只能取值 不能设置
UIInterfaceOrientation 是你程序界面的当前旋转方向 这个可以设置
判断设备现在的方向:
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { //宣告一個UIDevice指標,並取得目前Device的狀況 UIDevice *device = [UIDevice currentDevice] ; //取得當前Device的方向,來當作判斷敘述。(Device的方向型態為Integer) switch (device.orientation) { case UIDeviceOrientationFaceUp: NSLog(@"螢幕朝上平躺"); break; case UIDeviceOrientationFaceDown: NSLog(@"螢幕朝下平躺"); break; //系統無法判斷目前Device的方向,有可能是斜置 case UIDeviceOrientationUnknown: NSLog(@"未知方向"); break; case UIDeviceOrientationLandscapeLeft: NSLog(@"螢幕向左橫置"); break; case UIDeviceOrientationLandscapeRight: NSLog(@"螢幕向右橫置"); break; case UIDeviceOrientationPortrait: NSLog(@"螢幕直立"); break; case UIDeviceOrientationPortraitUpsideDown: NSLog(@"螢幕直立,上下顛倒"); break; default: NSLog(@"無法辨識"); break; } // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向 }
Portrait 表示 纵向,Landscape 表示 横向。
typedef enum { 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 } UIDeviceOrientation;
typedef enum { UIInterfaceOrientationPortrait = UIDeviceOrientationPortrait, UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight, UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft } UIInterfaceOrientation;
#define UIDeviceOrientationIsPortrait(orientation) ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown) #define UIDeviceOrientationIsLandscape(orientation) ((orientation) == UIDeviceOrientationLandscapeLeft || (orientation) == UIDeviceOrientationLandscapeRight)
上面是重要的源代码,已经解释的非常清楚。UIDeviceOrientationIsPortrait(orientation) 跟 ((orientation) == UIDeviceOrientationPortrait || (orientation) == UIDeviceOrientationPortraitUpsideDown) 完全是一个意思。