ios - 如何将字符串转换为 CLLocationDegrees Swift 2

Question

我正在尝试转换从 Firebase 检索的字符串并将其添加为 Google map 上的多个注释。不幸的是，我的应用程序在执行当前代码时崩溃:

ref = FIRDatabase.database().reference()
    ref.child("Locations").observeSingleEventOfType(.Value, withBlock: { (snapshot) in
        let lat = (snapshot.value!["Latitude"] as! NSString).doubleValue
        let lon = (snapshot.value!["Longitude"] as! NSString).doubleValue



        let complainLoc = CLLocationCoordinate2DMake(lat, lon)

        let Coordinates = CLLocationCoordinate2D(latitude: lat, longitude: lon)

    })

My JSON Tree

My Code Block Which Crashes

这是我用来将数据保存到 Firebase 的代码

FIRDatabase.database().reference().child("Location").child(FIRAuth.auth()!.currentUser!.uid).setValue(["Latitude": locationManager.location!.coordinate.latitude, "Longitude": locationManager.location!.coordinate.longitude])

Answer 1

SWIFT 5

let dbLat = Double(latStr)  // Convert String to double
let dbLong = Double(longStr)

使用经纬度

let center = CLLocationCoordinate2D(latitude: dbLat! , longitude: dbLong! )

let pointAnnotation = MKPointAnnotation()
 pointAnnotation.coordinate = CLLocationCoordinate2D(latitude: dbLat!, longitude:dbLong!)