UIDeviceOrientation和UIInterfaceOrientation屏幕旋转的用法

最新推荐文章于 2022-07-17 17:26:59 发布

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本文详细介绍了iOS设备的方向（UIDeviceOrientation）及其变化如何影响界面方向（UIInterfaceOrientation），并阐述了如何通过注册通知来识别这些变化。通过实例代码展示了如何在应用中实时响应设备方向的调整。

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1. UIDeviceOrientation是设备的方向，只能读，不能修改

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {
    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
};

2. UIInterfaceOrientation程序界面的方向，可以修改

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {
    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,
    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,
    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft
};

3. landscape 表示横向 portrait 表示纵向

4. 获取设备方向发生的变化，需要注册UIDeviceOrientationDidChangeNotification通知

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(handleDeviceOrientationDidChange)
                                                 name:UIDeviceOrientationDidChangeNotification 
                                               object:nil];
    
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

    [[NSNotificationCenter defaultCenter] removeObserver:self
                                                    name:UIDeviceOrientationDidChangeNotification
                                                  object:nil];
    
    [[UIDevice currentDevice] endGeneratingDeviceOrientationNotifications];

5. 识别设备方向的变化

- (BOOL)handleDeviceOrientationDidChange:(UIInterfaceOrientation)interfaceOrientation  
{  
    //宣告一個UIDevice指標，並取得目前Device的方向  
    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;
}