ios - 获取设备当前的方向(应用扩展)

如何在App Extension中获取设备当前方向，我尝试了以下两种方法，但均未成功。

总是返回UIDeviceOrientationUnknown

[[UIDevice currentDevice] orientation]

它显示红色消息，表示“sharedApplication”在iOS上不可用(应用程序扩展)

[[UIApplication sharedApplication] statusBarOrientation];

我也添加了一个观察者，但是没有被调用。

[[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"];
}

因此，现在任何人如何获得当前的设备方向。

最佳答案

我有个主意!

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
        }
    }

}

编辑:在Swift 4上，您可以执行以下操作:

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
        }
    }
}

关于ios - 获取设备当前的方向(应用扩展)，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/25462091/