UIDeviceOrientation 和 UIInterfaceOrientation 设备旋转的用法 （实例）

判断设备现在的方向：

C代码



- (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

}

或者

C代码



- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;

if (UIDeviceOrientationIsLandscape(deviceOrientation)) NSLog(@"横向");

else if(UIDeviceOrientationIsPortrait(deviceOrientation)) NSLog(@"纵向");

// // 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。

C代码



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;

C代码



typedef enum {

UIInterfaceOrientationPortrait = UIDeviceOrientationPortrait,

UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,

UIInterfaceOrientationLandscapeLeft = UIDeviceOrientationLandscapeRight,

UIInterfaceOrientationLandscapeRight = UIDeviceOrientationLandscapeLeft

} UIInterfaceOrientation;

C代码



#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。