转换地图上注释中输入的地址 - SwiftUI

Question

我是初学者，很抱歉我的问题。

我在数据文件中有一张地图和注释。

现在我希望用户能够使用表格注册地址。

如何从普通地址转到

location: CLLocationCoordinate2D(latitude: 48.8566, longitude: 2.3522)

感谢您的帮助

Answer 1

Core Location 有一个“地理编码器”，它将街道地址转换为 CLLocationCoordinate2D。

这来自苹果官方文档 (https://developer.apple.com/documentation/corelocation/converting_between_coordinates_and_user-friendly_place_names):

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?)
    }
}

请注意，前面的函数使用了回调函数并且是一个异步函数。这意味着它不会立即 return -- 相反，它会在未来不确定的时间完成并在完成时调用回调函数。

由于您标记了 SwiftUI 问题，以下是 SwiftUI 的一个简单示例：

import SwiftUI
import MapKit

class LocationManager : ObservableObject {
    @Published var location : CLLocationCoordinate2D?
    
    func convertAddress(address: String) {
        getCoordinate(addressString: address) { (location, error) in
            if error != nil {
                //handle error
                return
            }
            DispatchQueue.main.async {
                self.location = location
            }
        }
    }
    
    private 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?)
        }
    }
}

struct ContentView: View {
    @State var addressString = "1600 Pennsylvania Ave, Washington D.C."
    @StateObject private var locationManager = LocationManager()
    
    var body: some View {
        VStack {
            Text("Address: \(addressString)")
            if let location = locationManager.location {
                Text("Lat: \(location.latitude) Long: \(location.longitude)")
            }
        }.onAppear {
            locationManager.convertAddress(address: addressString)
        }
    }
}

转换地图上注释中输入的地址 - SwiftUI

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