iOS判斷當前設備旋轉方向

UIDeviceOrientation      是機器硬件的當前旋轉方向   這個你只能取值 不能設置

UIInterfaceOrientation   是你程序界面的當前旋轉方向   這個可以設置 

UIDeviceOrientation oriention = [UIDevice currentDevice].orientation;
 
    UIInterfaceOrientation interfaceOriention = (UIInterfaceOrientation)oriention;
 
    switch (interfaceOriention) {
 
        case UIInterfaceOrientationUnknown:
 
            NSLog(@"位置方向");
 
            break;
 
        case UIInterfaceOrientationPortrait:
 
            NSLog(@"第0個旋轉方向---電池欄在上");
 
            [self shrinkScreenButtonClick];
 
            break;
 
        case UIInterfaceOrientationPortraitUpsideDown:
 
            NSLog(@"第3個旋轉方向---電池欄在下");
 
            [self shrinkScreenButtonClick];
 
            break;
 
        case UIInterfaceOrientationLandscapeLeft:
 
            [self fullScreenButtonClickRight];
 
            NSLog(@"第2個旋轉方向---電池欄在右");
 
            break;
 
        case UIInterfaceOrientationLandscapeRight:
 
            [self fullScreenButtonClick];
 
            NSLog(@"第1個旋轉方向---電池欄在左");
 
            break;
 
        default:
 
            break;
 
            
 
    }
 
- (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); // 只支持向左橫向, YES 表示支持所有方向  
}  
Portrait 表示 縱向，Landscape 表示 橫向。