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：

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。