iOS - MapKit 相机旋转动画

Question

我正在尝试在 MapKit 上制作一些花哨的旋转(带间距)动画。使用此代码

func animateCamera() {
        let newCamera: MKMapCamera? = mapView.camera
            newCamera?.pitch = 90.0
            newCamera?.heading = 180.0
            newCamera?.altitude = 200.0

        let camera: MKMapCamera? = mapView.camera
            camera?.pitch = 0.0
            camera?.heading = 360.0
            camera?.altitude = 20.0

        UIView.animate(withDuration: 3.0, delay: 0.0, options: ([.curveLinear, .beginFromCurrentState]), animations: {() -> Void in
            self.mapView.setCamera(newCamera!, animated: true);
        }, completion: {(_ finished: Bool) -> Void in
            print("has not been interrupted : \(finished)")
        })

        UIView.animate(withDuration: 3.0, delay: 3.0, options: ([.curveLinear, .beginFromCurrentState]), animations: {() -> Void in
            self.mapView.setCamera(camera!, animated: true);
        }, completion: {(_ finished: Bool) -> Void in
            print("has not been interrupted : \(finished)")
        })
 }

但是当我运行该函数时，它只会捕捉到给定的航向、俯仰和高度，而不会设置动画。我错过了什么或做错了什么？

提前致谢!

Answer 1

我知道必须有更好的方法来做到这一点，但这是我找到的方法，并且有效，主要问题是知道动画何时结束，我没有找到任何线索，所以我用2秒作为任意时间

func animateCamera() {
    let newCamera: MKMapCamera = MKMapCamera(lookingAtCenter: self.mapView.camera.centerCoordinate, fromDistance: 200.0, pitch: 90.0, heading: 180.0)
    self.mapView.setCamera(newCamera, animated: true)

    DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(Int64(2 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC)) {
        let newCamera: MKMapCamera = MKMapCamera(lookingAtCenter: self.mapView.camera.centerCoordinate, fromDistance: 20.0, pitch: 0.0, heading: 360.0)
        self.mapView.setCamera(newCamera, animated: true)
    }
}

希望对你有帮助