UIDeviceOrientation 和 UIInterfaceOrientation 设备旋转的用法

最新推荐文章于 2019-08-23 18:35:07 发布

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#设备旋转

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本文介绍了iOS设备中UIDeviceOrientation与UIInterfaceOrientation的区别及其应用场景，提供了判断设备当前方向的示例代码，并解释了如何通过代码判断设备是处于纵向还是横向状态。

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  收藏代码
- (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  收藏代码
- (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  收藏代码
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  收藏代码
typedef enum {  
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,  
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,  
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,  
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft  
} UIInterfaceOrientation;  

C代码  收藏代码
#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。