ios - 使用 Swift 将 NSString 转换为 CLLocationCoordinate2DMake

Question

如何将 NSString 转换为 CLLocationCoordinate2DMake。我想在 map 上做一个标记。这是我所做的，但出现“NSString 不可转换为 CLLocationDegrees”错误。

for openComplain in openComplains {

                                var lat = openComplain["lat"] as NSString
                                var long = openComplain["lng"] as NSString
                                NSLog("Lat is %@",lat)
                                NSLog("long is %@",long)




                                var complainLoc = CLLocationCoordinate2DMake(lat, long)

                                var marker : GMSMarker = GMSMarker(position: complainLoc)
                                marker.title = "Complain 1"
                                marker.map = self.mapView
                            }

我试过了

var lat = (openComplain["lat"] as NSString).doubleValue
var long = (openComplain["lng"] as NSString).doubleValue

但在那种情况下，我得到的是空值。请帮忙。

Answer 1

您只需在将字典可选值转换为 Double 之前解包:

var lat  = (openComplain["lat"]! as NSString).doubleValue
var long = (openComplain["lng"]! as NSString).doubleValue