我没有看到关于SO的问题,但所有问题都在Swift 2中已经存在。我从Apple网站获得了此功能,可以将城市名称转换为纬度和经度,但是我不确定该函数将返回什么(因为return语句后没有任何内容) )以及我应该通过什么。有人可以解释一下吗,或者告诉我如何使用它。
func getCoordinate( addressString : String, completionHandler: @escaping(CLLocationCoordinate2D, NSError?) -> Void ) { let geocoder = CLGeocoder() geocoder.geocodeAddressString(addressString) { (placemarks, error) in if error == nil { if let placemark = placemarks?[0] { let location = placemark.location! completionHandler(location.coordinate, nil) return } } completionHandler(kCLLocationCoordinate2DInvalid, error as NSError?) } }
您可以按照以下步骤进行操作:
import CoreLocation func getCoordinateFrom(address: String, completion: @escaping(_ coordinate: CLLocationCoordinate2D?, _ error: Error?) -> () ) { CLGeocoder().geocodeAddressString(address) { completion($0?.first?.location?.coordinate, $1) } }
用法:
let address = "Rio de Janeiro, Brazil" getCoordinateFrom(address: address) { coordinate, error in guard let coordinate = coordinate, error == nil else { return } // don't forget to update the UI from the main thread DispatchQueue.main.async { print(address, "Location:", coordinate) // Rio de Janeiro, Brazil Location: CLLocationCoordinate2D(latitude: -22.9108638, longitude: -43.2045436) } }