获取设备当前方向（App Extension） [英] Get device current orientation (App Extension)

问题描述

如何在App Extension中获取设备当前方向，我尝试了以下两种方法但没有成功。

1. 它总是返回UIDeviceOrientationUnknown

     [[UIDevice currentDevice] orientation] 
     




2. 它显示红色消息，'sharedApplication'在iOS上不可用（App Extension）

     [[UIApplication sharedApplication] statusBarOrientation]; 
     




3. 我还添加了一个观察者，但没有被调用。

   
   
   'pre> [[NSNotificationCenter defaultCenter]的addObserver：self.view选择器：@selector（notification_OrientationWillChange :)名：UIApplicationWillChangeStatusBarOrientationNotification对象：无];



- （无效）notification_OrientationWillChange：（NSNotification *）N
{
UIInterfaceOrientation取向=（UIInterfaceOrientation）[[n.userInfo objectForKey：UIApplicationStatusBarOrientationUserInfoKey ] intValue];

if（orientation == UIInterfaceOrientationLandscapeLeft）
[self.textDocumentProxy insertText：@Left];
if（orientation == UIInterfaceOrientationLandscapeRight）
[self.textDocumentProxy insertText：@Right];
}


那么现在怎么样？任何人都可以获得当前的设备定位。

解决方案

我有个主意！

 延伸UIScreen {
 
 VAR取向：UIInterfaceOrientation {
设点= coordinateSpace.convertPoint（CGPointZero，toCoordinateSpace：fixedCoordinateSpace）
如果点= = CGPointZero {
 return .Portrait 
}否则如果point.x！= 0&& point.y！= 0 {
 return .PortraitUpsideDown 
}否则如果point.x == 0&& point.y！= 0 {
 return .LandscapeLeft 
}否则如果point.x！= 0&& point.y == 0 {
 return .LandscapeRight 
} else {
 return .Unknown 
} 
} 
 
} 
  

编辑：在Swift 4上你可以这样做：

 扩展UIScreen {
 var orientation：UIInterfaceOrientation {
 let point = coordinateSpace.convert（CGPoint.zero，to：fixedCoordinateSpace）
开关（point.x，point.y）{
 case（0,0）：
 return .portrait 
 case let（x，y）其中x！= 0&& y！= 0：
返回.portraitUpsideDown 
 case let（0，y）其中y！= 0：
返回.landscapeLeft 
 case let（x，0）其中x！ = 0：
返回.landscapeRight 
默认值：
返回.unknown 
} 
} 
} 
  

How to get device current orientation in an App Extension, I have tried below two methods but no success.

1. It always return UIDeviceOrientationUnknown

   [[UIDevice currentDevice] orientation]
   

2. It shows red message that ‘sharedApplication’ is not available on iOS (App Extension)

   [[UIApplication sharedApplication] statusBarOrientation];
   

3. I also add an observer but it not getting called.

   [[NSNotificationCenter defaultCenter] addObserver:self.view selector:@selector(notification_OrientationWillChange:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil];
   
   
   
   - (void)notification_OrientationWillChange:(NSNotification*)n
   {
      UIInterfaceOrientation orientation = (UIInterfaceOrientation)[[n.userInfo objectForKey:UIApplicationStatusBarOrientationUserInfoKey] intValue];
   
       if (orientation == UIInterfaceOrientationLandscapeLeft)
          [self.textDocumentProxy insertText:@"Left"];
       if (orientation == UIInterfaceOrientationLandscapeRight)
          [self.textDocumentProxy insertText:@"Right"];
   }
   

So now how can anyone get current device orientation.

解决方案

I got an idea!

extension UIScreen {

    var orientation: UIInterfaceOrientation {
        let point = coordinateSpace.convertPoint(CGPointZero, toCoordinateSpace: fixedCoordinateSpace)
        if point == CGPointZero {
            return .Portrait
        } else if point.x != 0 && point.y != 0 {
            return .PortraitUpsideDown
        } else if point.x == 0 && point.y != 0 {
            return .LandscapeLeft
        } else if point.x != 0 && point.y == 0 {
            return .LandscapeRight
        } else {
            return .Unknown
        }
    }

}

EDIT: On Swift 4 you can do:

extension UIScreen {
    var orientation: UIInterfaceOrientation {
        let point = coordinateSpace.convert(CGPoint.zero, to: fixedCoordinateSpace)
        switch (point.x, point.y) {
        case (0, 0):
            return .portrait
        case let (x, y) where x != 0 && y != 0:
            return .portraitUpsideDown
        case let (0, y) where y != 0:
            return .landscapeLeft
        case let (x, 0) where x != 0:
            return .landscapeRight
        default:
            return .unknown
        }
    }
}

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