使用Swift將NSString轉換爲CLLocationCoordinate2DMake

Question

如何將NSString轉換爲CLLocationCoordinate2DMake。我想在地圖上做一個標記。這是我所做的，但我得到「NSString不能轉換爲CLLocationDegrees」錯誤。

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 
          } 

我已經試過

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

但在這種情況下，我得到空值。請幫忙。

Answer 1

你必須將其轉換爲雙前解開字典可選值：

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