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：

 1 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  
 2 {  
 3     //宣告一個UIDevice指標，並取得目前Device的狀況  
 4     UIDevice *device = [UIDevice currentDevice] ;   
 5       
 6     //取得當前Device的方向，來當作判斷敘述。（Device的方向型態為Integer）  
 7     switch (device.orientation) {  
 8         case UIDeviceOrientationFaceUp:  
 9         NSLog(@"螢幕朝上平躺");  
10             break;  
11               
12         case UIDeviceOrientationFaceDown:  
13         NSLog(@"螢幕朝下平躺");  
14             break;  
15               
16         //系統無法判斷目前Device的方向，有可能是斜置   
17         case UIDeviceOrientationUnknown:  
18         NSLog(@"未知方向");  
19             break;  
20               
21         case UIDeviceOrientationLandscapeLeft:  
22         NSLog(@"螢幕向左橫置");  
23             break;  
24               
25         case UIDeviceOrientationLandscapeRight:  
26         NSLog(@"螢幕向右橫置");  
27             break;  
28               
29         case UIDeviceOrientationPortrait:  
30         NSLog(@"螢幕直立");  
31             break;  
32               
33         case UIDeviceOrientationPortraitUpsideDown:  
34         NSLog(@"螢幕直立，上下顛倒");  
35             break;  
36               
37         default:  
38         NSLog(@"無法辨識");  
39             break;  
40     }  
41   
42     // Return YES for supported orientations  
43     return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft); // 只支持向左横向, YES 表示支持所有方向  
44 }

或者

- (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。

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。

posted on 2014-09-11 11:06  ZiCheng  阅读(370)  评论(0)    收藏  举报