Question

我正在尝试查看设备是处于纵向还是横向模式。如果设备没有朝上，我的代码工作得很好。如果它面朝上（和方向== 5），它将无法区分肖像和风景。如果UIDeviceOrientation是FaceUp，那么无论如何都要确定横向/纵向方面的“方向”吗？

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!!!");
}

Answer 1

你不应该混淆UIDeviceOrientation和UIInterfaceOrientation，它们是不同的但是相关的，如声明所示

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

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

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

在任何情况下，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，如果您的应用不是所有[[UIDevice currentDevice] orientation]轮播到横向可以是UIDeviceOrientationLandscapeLeft，而viewController.interfaceOrientation可以是UIInterfaceOrientationPortrait。

<强>更新从iOS 8.0开始，不推荐使用[UIViewController interfaceOrientation]。提供here的替代方案是[[UIApplication sharedApplication] statusBarOrientation]。这也会返回UIInterfaceOrientation。

Answer 2

我制作这个代码骨架来处理想要的＆amp;不需要的设备方向，在我的情况下，我想忽略UIDeviceOrientationUnknown，UIDeviceOrientationFaceUp和UIDeviceOrientationFaceDown，缓存最后允许的方向。此代码适用于iPhone和iPad设备，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 */
        }
    }
}

Answer 3

从iOS13开始使用

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

UIDeviceOrientationFaceUp - 如何区分肖像和风景？

3 个答案: