ios - 将 CLLocationCoordinate2D 坐标转换为 CGPoint Swift

Question

我在 iOS Swift 应用程序中有一个 Google map 。我正在尝试获取当前用户坐标的 CGPoint 位置，以便我可以在周围应用一些动画。但是我无法在 CGPoint 中找到我的坐标位置。

我基本上是在尝试为我当前的用户标记添加脉冲动画。这是我的动画代码 -

class Pulsing: CALayer {
    var animationGroup = CAAnimationGroup()

    var initialPulseSacle:Float = 0
    var nextPluseAfter:TimeInterval = 0
    var animationDuration:TimeInterval = 1.5
    var radius:CGFloat = 200
    var numberOfPulse:Float = Float.infinity

    override init(layer: Any) {
        super.init(layer: layer)
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }

    init(numberOfPulse:Float = Float.infinity, radius:CGFloat, position:CGPoint){
            super.init()
            self.backgroundColor = UIColor.blue.cgColor
            self.contentsScale = UIScreen.main.scale
            self.opacity = 0
            self.radius = radius
            self.position = position

            self.bounds = CGRect(x: 0, y: 0, width: radius*2, height: radius*2)
            self.cornerRadius = radius

            DispatchQueue.global(qos: DispatchQoS.QoSClass.default).async {
                self.setupAnimationGroup()

                DispatchQueue.main.async {
                    self.add(self.animationGroup, forKey: "pulse")
                }
            }

    }
    func createScaleAnimation () -> CABasicAnimation{
        let scaleAnimation = CABasicAnimation(keyPath: "transferm.scale.xy")
        scaleAnimation.fromValue = NSNumber(value: initialPulseSacle)
        scaleAnimation.toValue = NSNumber(value: 1)
        scaleAnimation.duration = animationDuration
        return scaleAnimation
    }
    func createOpacityAnimation () -> CAKeyframeAnimation{
        let opacityAnimation = CAKeyframeAnimation(keyPath: "opacity")
        opacityAnimation.duration = animationDuration
        opacityAnimation.values = [4.0, 8.0, 0]
        opacityAnimation.keyTimes = [0, 0.2, 1]
        return opacityAnimation
    }

    func setupAnimationGroup(){
        self.animationGroup = CAAnimationGroup()
        self.animationGroup.duration = animationDuration + nextPluseAfter
        self.animationGroup.repeatCount = numberOfPulse
        let defaultCurve = CAMediaTimingFunction(name: kCAMediaTimingFunctionDefault)
        self.animationGroup.timingFunction = defaultCurve
        self.animationGroup.animations = [createScaleAnimation(),createOpacityAnimation()]
    }

}

然后这就是我在设置标记方法中调用它的方式 -

func setuplocationMarker(coordinate: CLLocationCoordinate2D,address:String) {
        locationMarker = GMSMarker(position: coordinate)
        locationMarker.map = viewMap
        locationMarker.title = address
        locationMarker.appearAnimation = GMSMarkerAnimation.pop
        locationMarker.icon = GMSMarker.markerImage(with: UIColor.red)
        locationMarker.opacity = 0.75

        let pulse = Pulsing(numberOfPulse: 1, radius: 80, position:CGPoint(x: CGFloat(Float(coordinate.latitude)), y: CGFloat(Float(coordinate.longitude))))
        pulse.animationDuration = 0.8
        pulse.backgroundColor = UIColor.blue.cgColor
        self.view.layer.insertSublayer(pulse, below: locationMarker.layer)
    }

使用此代码，它会在左上角显示脉冲动画，而不是在位置标记周围。我如何为我的标记获取正确的 cgpoint 位置。提前致谢!

Answer 1

您不能使用纬度和经度将 CLLocationCoordinate2D 直接转换为 CGPoint。大多数 map API 都会提供一种方法来为您执行此操作。

Google 的 map API 提供 pointFromCoordinate它在 GMSMapView 的框架中创建了一个 CGPoint。这是 GMSProjection 上的一个方法，您可以从 GMSMapView 的“projection”属性中获取该方法。

然后您可以使用 Apple 的 convertPoint:toView: 将其转换为另一个 UIView 的坐标空间例如:

let location = mapView.userLocation
let point = mapView.projection.pointFromCoordinate(location.coordinate)
let pointInNewView = newView.convert(point, from: mapView)