使用未解析的标识符“地图"SwiftUI [英] Use of unresolved identifier 'Map' SwiftUI

问题描述

我正在关注 SwiftUI 的官方教程和遇到错误消息使用未解析的标识符地图".即使我复制并粘贴教程中的代码，它仍然给我错误.我已经查看了一些类似问题的解决方案，但似乎找不到任何可行的方法.代码如下.

I am following the official tutorial for SwiftUI and have run into the error message 'Use of unresolved identifier 'Map'. Even when I copy and and paste the code from the tutorial, it is still giving me the error. I have looked at a few solutions for similar issues and can't seem to find anything that will work. Code below.

import SwiftUI
import MapKit

struct MapView: View {
    @State private var region = MKCoordinateRegion(
        center: CLLocationCoordinate2D(latitude: 34.011_286, longitude: -116.166_868),
        span: MKCoordinateSpan(latitudeDelta: 0.2, longitudeDelta: 0.2)
    )

    var body: some View {
        Map(coordinateRegion: $region)
    }
    }

    struct MapView_Previews: PreviewProvider {
    static var previews: some View {
        MapView()
    }
}

如果这真的很明显，我很抱歉 - 但我是 Swift/SwiftUI 的新手，看不出问题出在哪里.提前致谢！

I apologise if this is really obvious - but I'm new to Swift/SwiftUI, and can't see where the issue is coming from. Thanks in advance!

推荐答案

在这种情况下，我也遇到了麻烦.因此，我使用 UIViewRepresentable 和 2 种方法创建 View 方法:'makeUIView' 和 'updateUIView'.

I also got into trouble in this case. So, I make View method using UIViewRepresentable with 2 methods: 'makeUIView' and 'updateUIView'.

地图视图

import SwiftUI
import MapKit

struct MapViewUI: UIViewRepresentable {
    func makeUIView(context: Context) -> MKMapView {
         MKMapView(frame: .zero)
    }
    func updateUIView(_ view: MKMapView, context: Context) {
            let coordinate = CLLocationCoordinate2D(
                latitude: 2.6540427, longitude: 98.8932576)
            let span = MKCoordinateSpan(latitudeDelta: 2.0, longitudeDelta: 2.0)
            let region = MKCoordinateRegion(center: coordinate, span: span)
            view.setRegion(region, animated: true)
    }
}

而且，你可以像这样调用你的视图

And, You can call your View looks like this

struct MapPageView: View {
    var body: some View {
        VStack {
            MapViewUI()
                .frame(height: 300)
        }
    }
}

这篇关于使用未解析的标识符“地图"SwiftUI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！