ios - UIKit swift 5 : Set UIView Rotation Angle

Question

我正在构建一个具有罗盘功能和一些附加功能的应用程序。我的目标是根据真北方向旋转罗盘 UIImageView。

是否可以为图像设置特定的旋转角度(如在 Photoshop 或 Figma 中)而不是将其旋转一定量？

我目前的实现是这样的:

    func rotate(view: UIView, radians: Double) {
        UIView.animate(withDuration: 0.5) {
            view.transform = view.transform.rotated(by: CGFloat(radians))
        }
    }
    func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
        let newRad = deg2rad(newHeading.trueHeading)
        rotate(view: compassImageView, radians: compassRad-newRad)
        compassRad = newRad
    }

我希望做点什么:

compassImageView.layer.setRotationAngle(radians: newHeading.trueHeading)

有这样的东西吗？

Answer 1

如果我没理解错的话，你想要:

func rotate(view: UIView, to angle: Double) {
    UIView.animate(withDuration: 0.5) {
        view.transform = CGAffineTransform(rotationAngle: angle)
    }
}
func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
    let newRad = deg2rad(newHeading.trueHeading)
    rotate(view: compassImageView, to: newRad)
    compassRad = newRad
}

或者它可能是 -newRad，这取决于这些角度的走向，我永远不记得了:)