如何制作一个 return 从地址 swift 坐标的函数 4

Question

您好，我想接收地址的坐标。我做了这个功能但没有用。 Return 总是 0.0, 0.0

 func getCoordinates(address: String)->(Double, Double){
    DispatchQueue.main.async {
        let geoCoder = CLGeocoder()

        geoCoder.geocodeAddressString(address) { (placemarks, error) in
            guard let placemarks = placemarks, let location = placemarks.first?.location else {  return }
            latitude = location.coordinate.latitude
            longitude = location.coordinate.longitude

        }
    }
    return (latitude ?? 0.0, longitude ?? 0.0)

}

Answer 1

您需要完成并在地理编码器的回调中插入主队列块

func getCoordinates(_ address: String,completion:@escaping((CLLocationCoordinate2D) -> ())){
    let geoCoder = CLGeocoder()
    geoCoder.geocodeAddressString(address) { (placemarks, error) in
        guard let placemarks = placemarks, let location = placemarks.first?.location else {  return }
        DispatchQueue.main.async {
            completion(location.coordinate)
        }
    }
}

通话

getCoordinates("someAdd") {  loc in

}

如何制作一个 return 从地址 swift 坐标的函数 4

How to make a function that return coordinates from address swift 4

function

clgeocoder

swift