ios - 使用 Swift 在 iOS 中将 CFAffineTransformRotation 应用于父 View 时禁用 subview 的自动旋转？

Question

让我们考虑一下，在 ViewController 中，我有一个 View 和 5 个按钮，它们是该 View 的 subview 。我的问题是，当我应用 CGAffineTransform.identity.rotated 来查看时，它的旋转完美如我所料。但是那 5按钮也朝那个旋转，我不想旋转按钮。谁能告诉我，我希望那个按钮不应该朝父 View 旋转。我对按钮应用了相反的角度，但按钮的大小正在调整。

    UIViewController(portrait mode)
         UIView(should rotate)
            button1(shouldn't rotate)
            button2(shouldn't rotate).......
            button5(shouldn't rotate)

  func locationManager(_ manager: CLLocationManager, didUpdateHeading heading: CLHeading) {


      let maxLat: Double = fmax(userLocation.latitude,  userLocation.latitude)
        let maxLon: Double = fmax(userLocation.longitude, userLocation.longitude)
        let minLat: Double = fmin(userLocation.latitude,  userLocation.latitude)
        let minLon: Double = fmin(userLocation.longitude, userLocation.longitude)
        let center: CLLocationCoordinate2D = CLLocationCoordinate2DMake((maxLat + minLat) / 2, (maxLon + minLon) / 2)
        angle2U = getBearing(toPoint: center, longitude: userLocation.longitude, latitude: userLocation.latitude)
        let direction2G = CGFloat(heading.magneticHeading * Double.pi/180)
        DispatchQueue.main.async {
            let direction2GN = CGFloat(self.angle2U) - direction2G
            let final_transform = CGAffineTransform.identity.rotated(by: direction2GN)
            self.compass_view.transform = final_transform
            self.optionbutton1.transform = compass_view.transform.inverted()
self.option_button2.transform = compass_view.transform.inverted()
self.option_button3.transform = compass_view.transform.inverted()
self.option_button4.transform = compass_view.transform.inverted()
self.option_button5.transform = compass_view.transform.inverted()

        }
    }

Answer 1

您应该向后旋转按钮。

您可以使用 inverted()为了那个原因。例如:

let transform = // your CGAffineTransform
view.transform = transform 
button1.transform = transform.inverted()
...
button5.transform = transform.inverted()

或者:

button1.transform = yourRotatedView.transform.inverted()
...
button5.transform = yourRotatedView.transform.inverted()