Question

我在iOS Swift应用中有一个谷歌地图。我正在尝试获取当前用户坐标的CGPoint位置，以便我可以应用一些动画。但是我无法在我的坐标中获得CGPoint的位置。

我基本上是在尝试为当前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法 -

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，它会在顶部角落显示脉冲动画，而不是位置标记周围。如何为我的标记获得正确的cgpoint位置。在此先感谢！

Answer 1

您无法使用纬度和经度直接将CLLocationCoordinate2D转换为CGPoint。大多数地图API将为您提供一种方法。

Google的Map API提供pointFromCoordinate，可在CGPoint的框架中创建GMSMapView。这是GMSProjection上的一种方法，您可以从GMSMapView上的“投影”属性获取该方法。

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)

将CLLocationCoordinate2D坐标转换为CGPoint Swift

1 个答案: