UIDeviceOrientationFaceUp - 如何区分纵向和横向？

问题描述：

我试图找出设备是否处于纵向或横向模式。如果设备不朝上，我的代码工作得很好。如果它面朝上（并且方向== 5），则它将不区分纵向和横向。无论如何，如果UIDeviceOrientation是FaceUp，那么根据横向/纵向来确定“定位”？UIDeviceOrientationFaceUp - 如何区分纵向和横向？

我的代码：

UIDeviceOrientation interfaceOrientation = [[UIDevice currentDevice] orientation]; 

NSLog(@"orientation: %d", interfaceOrientation); 

if (interfaceOrientation == UIDeviceOrientationIsLandscape(interfaceOrientation)) { 
    NSLog(@"LANDSCAPE!!!"); 
} 

if (interfaceOrientation == UIDeviceOrientationIsPortrait(interfaceOrientation)) { 
    NSLog(@"PORTRAIT!!!"); 
}

答

你不应该混淆UIDeviceOrientation和UIInterfaceOrientation，它们是不同的，但相关的如通过其声明

typedef enum { 
    UIDeviceOrientationUnknown, 
    UIDeviceOrientationPortrait, 
    UIDeviceOrientationPortraitUpsideDown, 
    UIDeviceOrientationLandscapeLeft, 
    UIDeviceOrientationLandscapeRight, 
    UIDeviceOrientationFaceUp, 
    UIDeviceOrientationFaceDown 
} UIDeviceOrientation; 

typedef enum { 
    UIInterfaceOrientationPortrait   = UIDeviceOrientationPortrait, 
    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown, 
    UIInterfaceOrientationLandscapeLeft  = UIDeviceOrientationLandscapeRight, 
    UIInterfaceOrientationLandscapeRight  = UIDeviceOrientationLandscapeLeft 
} UIInterfaceOrientation;

UIDeviceOrientation告诉你的设备的方向是什么。 UIInterfaceOrientation告诉你界面的方向是什么，并且被UIViewController使用。 UIInterfaceOrientation显然是纵向或横向，而UIDeviceOrientation可能有不明确的值（UIDeviceOrientationFaceUp，UIDeviceOrientationFaceDown,UIDeviceOrientationUnknown）。

在任何情况下，你不应该试图确定一个UIViewController的方位[[UIDevice currentDevice] orientation]，因为不管是什么设备方向是UIViewController interfaceOrientation属性可以是不同的（例如，如果您的应用程序不旋转为横向的所有[[UIDevice currentDevice] orientation]能是UIDeviceOrientationLandscapeLeft，而viewController.interfaceOrientation可以是UIInterfaceOrientationPortrait）。

更新： 作为iOS的8.0，[UIViewController interfaceOrientation]已弃用。另一种提供here的替代品是[[UIApplication sharedApplication] statusBarOrientation]。这也返回UIInterfaceOrientation。

答

我有这样的代码框架来处理想&不必要的设备的方位，在我的情况，我想忽略UIDeviceOrientationUnknown，UIDeviceOrientationFaceUp和UIDeviceOrientationFaceDown，缓存最后允许的方向。此代码涉及iPhone和iPad设备，可以帮助您。

- (void)modXibFromRotation { 

    UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation]; 
    NSString *device = [[UIDevice currentDevice]localizedModel]; 
    UIInterfaceOrientation cachedOrientation = [self interfaceOrientation]; 

    if ([device isEqualToString:@"iPad"]) { 

     if (orientation == UIDeviceOrientationUnknown || 
      orientation == UIDeviceOrientationFaceUp || 
      orientation == UIDeviceOrientationFaceDown) { 

       orientation = (UIDeviceOrientation)cachedOrientation; 
     } 

     if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight) { 

      /* Your code */ 
     } 

     if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) { 

      /* Your code */  
     } 
    } 

    if ([device isEqualToString:@"iPhone"] || [device isEqualToString:@"iPod"]) { 

     if (orientation == UIDeviceOrientationUnknown || 
     orientation == UIDeviceOrientationFaceUp || 
     orientation == UIDeviceOrientationFaceDown) { 

      orientation = (UIDeviceOrientation)cachedOrientation; 
     } 

     if (orientation == UIDeviceOrientationLandscapeLeft || orientation == UIDeviceOrientationLandscapeRight) { 

      /* Your code */ 
     } 

     if (orientation == UIDeviceOrientationPortrait || orientation == UIDeviceOrientationPortraitUpsideDown) { 

      /* Your code */ 
     } 
    } 
}

UIDeviceOrientationFaceUp - 如何区分纵向和横向？

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