如何检查iPhone现在的位置(横向或纵向)？

Question

我有一个带标签栏的应用程序,每个标签中都有导航控制器.当用户摇动设备时,UIImageView在导航控制器中显示为子视图.但UIImageView必须包含特殊图像,具体取决于设备的当前方向.

如果我写的只是

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)
   if (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown) { 
   //Code
   }
   else if (interfaceOrientation == UIInterfaceOrientationLandscapeRight||interfaceOrientation == UIInterfaceOrientationLandscapeLeft) {
   //Code
   }
}

如果用户在摇动前旋转设备,视图就会变得疯狂.

有没有办法让iPhone出现当前定位？

Answer 1

这是宏UIDeviceOrientationIsLandscape和UIDeviceOrientationIsPortrait

所以相反单独检查你可以这样做......

if (UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation))
{
    // code for landscape orientation      
}

要么

 if (UIDeviceOrientationIsPortrait([UIDevice currentDevice].orientation))
 {
     // code for Portrait orientation       
 }

Answer 2

使用此处[[UIDevice currentDevice] orientation]指定的方法.

Answer 3

正如beno所说,如果您在视图中尽早检测到方向,这似乎是一个更好的答案.我无法获得批准的答案,以便在我的设置中尽早返回结果,但这非常有效.

if (UIDeviceOrientationIsPortrait(self.interfaceOrientation)){
//DO Portrait
}else{
//DO Landscape
}

Answer 4

要添加到已经回答的问题中:

您使用[[UIDevice currentDevice] orientation]哪个将产生以下值之一:

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

文档可以在这里找到- (方向)和这里 - (UIDeviceOrientation).

(我不是故意要求使用前者,但这些信息对于评论来说非常重要.)

Answer 5

试试这个:

[[UIApplication sharedApplication] statusBarOrientation]

或者在Swift 3中:

UIApplication.shared.statusBarOrientation

要专门检查特定方向,您还可以尝试这样的isLandscape或isPortrait属性:

UIApplication.shared.statusBarOrientation.isLandscape

问题[[UIDevice currentDevice] orientation]是,它也将返回UIInterfaceOrientationUnknown哪个statusBarOrientation没有.

还有一个UIViewController属性,interfaceOrientation但在iOS 8中已弃用,因此不推荐使用.

你在这里查看文档statusBarOrientation

Answer 6

如果您遇到困难并且不断从UIDevice获取UIDeviceOrientationUnknown,您还可以使用UIViewController类的interfaceOrientation属性.

有一个很好的总结,为什么[[UIDevice currentdevice]方向]有时会失败:http://bynomial.com/blog/？p = 25,特别是如果你想快速检测方向(例如,如果你想当应用程序退出后台时立即检查).

Answer 7

它可以帮助你......

-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft || [[UIDevice currentDevice] orientation ]== UIDeviceOrientationLandscapeRight)
 {
   NSLog(@"Lanscapse");
 }
if([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait || [[UIDevice currentDevice] orientation] == UIDeviceOrientationPortraitUpsideDown )
 {
   NSLog(@"UIDeviceOrientationPortrait");
 }
}

Answer 8

• 作为 Swift 4.2 的简单解决方案

  override func didRotate(from fromInterfaceOrientation: UIInterfaceOrientation) {
          switch UIDevice.current.orientation{
          case .portrait:
              print("Portrait")
          case .portraitUpsideDown:
              print("PortraitUpsideDown")
          case .landscapeLeft:
              print("LandscapeLeft")
          case .landscapeRight:
              print("LandscapeRight")
          default:
              print("Another")
          }
      }