ios - map 方向线未显示在 map 上

Question

试图给出用户位置与定义位置之间的方向线。精确定位是正确的，并且恰好位于所需位置，但没有将用户位置引导至定义位置的“线”方向。

它是这样完成的:

以及我绘制 map 以及解析 google maps API JSON 的代码:

func DrawDirection(url: String, cord: CLLocationCoordinate2D){
    request(url).responseJSON { response in
        let parsed = try? JSONSerialization.jsonObject(with: response.data!, options: []) as! [String:Any]
        let routes = parsed!["routes"] as! [[String:Any]]
        for route in routes {
            let dictArr = route["legs"] as? [[String:Any]]
            let dict = dictArr![0]["steps"] as? [[String:Any]]
            let start = dict![0]["start_location"] as? [String:Any]
            let lat = start!["lat"] as! Double
            let long = start!["lng"] as! Double
            let dotcoordinate = CLLocationCoordinate2D(latitude: CLLocationDegrees(lat), longitude: CLLocationDegrees(long))
            let routePoly = route["overview_polyline"] as! [String:Any]
            let points = routePoly["points"] as! String
            let line = points
            DispatchQueue.main.async {
                let bounds = GMSCoordinateBounds(coordinate: cord, coordinate: dotcoordinate)
                let update = GMSCameraUpdate.fit(bounds, with: UIEdgeInsetsMake(170, 30, 30, 30))
                self.CinemaLoc.moveCamera(update)
            }
            self.AddingPolyLine(encString: line, dir: cord, dot: dotcoordinate)
        }
    }
}

func AddingPolyLine(encString: String, dir: CLLocationCoordinate2D, dot: CLLocationCoordinate2D){
    let dotpath: GMSMutablePath = GMSMutablePath()
    dotpath.add(CLLocationCoordinate2DMake(dir.latitude, dir.longitude)) //original loc
    dotpath.add(CLLocationCoordinate2DMake(dot.latitude, dot.longitude)) //starting points
    let dotpoly = GMSPolyline(path: dotpath)
    dotpoly.map = self.CinemaLoc
    dotpoly.strokeWidth = 3.0
    let styles:[Any] = [GMSStrokeStyle.solidColor(.blue), GMSStrokeStyle.solidColor(.clear)]
    let lengths:[Any] = [10,5]
    dotpoly.spans = GMSStyleSpans(dotpoly.path!,styles as! 
[GMSStrokeStyle], lengths as! [NSNumber], GMSLengthKind.rhumb)
    let poly = GMSPolyline(path: dotpath)
    poly.strokeWidth = 3.0
    poly.strokeColor = .red
    poly.map = self.CinemaLoc
}

cord 是用户位置

一直在尝试所有可能的堆栈溢出方法，但没有得到任何改变，有时会有日志说“无法在路径 ~/GoogleMaps.bundle/GMSCacheStorage.momd/加载优化模型”

我的代码有问题吗？

Answer 1

对于特定路径，路径应该只创建一次，然后您可以向路径添加坐标。将 let dotpath: GMSMutablePath = GMSMutablePath() 放在方法调用中是错误的，每个循环都会调用它。