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。

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