UIDeviceOrientationFaceUp - 如何区分纵向和横向？

Posted 2023-03-12

【中文标题】UIDeviceOrientationFaceUp - 如何区分纵向和横向？

【英文标题】：UIDeviceOrientationFaceUp - how to distinguish between portrait and landscape?

【发布时间】：2011-11-05 08:59:29

【问题描述】：

我正在尝试确定设备是处于纵向还是横向模式。如果设备没有朝上，我的代码运行良好。如果它确实面朝上（并且方向 == 5），它将无法区分纵向和横向。如果 UIDeviceOrientation 是 FaceUp，是否可以确定横向/纵向的“方向”？

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!!!");

【参考方案1】：

你不应该混淆UIDeviceOrientation和UIInterfaceOrientation，它们是不同的，但正如他们的声明所显示的那样

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

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

UIDeviceOrientation 告诉您设备的方向。 UIInterfaceOrientation 告诉您界面的方向是什么，并由UIViewController 使用。 UIInterfaceOrientation 显然是纵向或横向，而 UIDeviceOrientation 可以有不明确的值（UIDeviceOrientationFaceUp、UIDeviceOrientationFaceDown、UIDeviceOrientationUnknown）。

在任何情况下，您都不应尝试使用[[UIDevice currentDevice] orientation] 来确定 UIViewController 的方向，因为无论设备方向是什么，UIViewController interfaceOrientation 属性都可能不同（例如，如果您的应用在所有[[UIDevice currentDevice] orientation] 都可以是UIDeviceOrientationLandscapeLeft 而viewController.interfaceOrientation 可以是UIInterfaceOrientationPortrait）。

更新： 从 ios 8.0 开始，[UIViewController interfaceOrientation] 已弃用。 here 提供的另一种选择是 [[UIApplication sharedApplication] statusBarOrientation]。这也会返回UIInterfaceOrientation。

【参考方案2】：

我制作这个代码框架来处理想要和不需要的设备方向，在我的例子中，我想忽略 UIDeviceOrientationUnknown、UIDeviceOrientationFaceUp 和 UIDeviceOrientationFaceDown，缓存最后允许的方向。此代码处理 iPhone 和 iPad 设备，可能对您有用。

- (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 */
        
    

【参考方案3】：

从 iOS13 开始使用

UIInterfaceOrientation orientation;
if (@available(iOS 13.0, *)) 
    orientation = self.window.windowScene.interfaceOrientation;
 else 
    orientation = [[UIApplication sharedApplication] statusBarOrientation];