我无法打印我在地图标记上拉出的 api

Question

我从地图标记中提取数据，当我打印时，我看到了所有这些数据，但我无法从示例中获取它们 (quake.latitude)。错误。即使它是一个列表，我也通过在括号中输入“(quakes) { quake in”来获取它，但现在我不知道如何通过 mapview 来实现。

struct MapAnnotationsView: View {

@State var quakes: [EarthQuake] = []

@State private var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 38.9520281, longitude: 35.6980142), span: MKCoordinateSpan(latitudeDelta: 30, longitudeDelta: 10))

let placeArray: [Place] = [Place(title: {quake.latitude}, coordinate: CLLocationCoordinate2D(latitude: 37.8008, longitude: 27.2465))]

var body: some View {
    Map(coordinateRegion: $region, annotationItems: placeArray) { annotation in
        // This makes a generic annotation that takes a View
        MapAnnotation(coordinate: annotation.coordinate) {
            // This is your custom view
            AnnotationView(placeName: annotation.title)
        }
    } .onAppear {
        Api().getEarthQuake { (quakes) in
            self.quakes = quakes
            
        }
    }
}
}

Error code screenshot

Answer 1

试试这个：

struct MapAnnotationsView: View {

@State private var region = MKCoordinateRegion(center: CLLocationCoordinate2D(latitude: 38.9520281, longitude: 35.6980142), span: MKCoordinateSpan(latitudeDelta: 30, longitudeDelta: 10))

@State private var placeArray: [Place] = []

var body: some View {
    Map(coordinateRegion: $region, annotationItems: placeArray) { annotation in
        // This makes a generic annotation that takes a View
        MapAnnotation(coordinate: annotation.coordinate) {
            // This is your custom view
            AnnotationView(placeName: annotation.title)
        }
    } .onAppear {
        Api().getEarthQuake { (quakes) in
            let tempArray = quakes.map{ quake in
                 Place(title: "\(quake.latitude)", coordinate: CLLocationCoordinate2D(latitude: 37.8008, longitude: 27.2465))
            }
            self.placeArray = tempArray
        }
    }
}
}

由于这不是一个可重现的示例，因此此处可能存在一些拼写错误，您必须自己解决。

解释：您的属性 placeArray 不能依赖于另一个属性。要获得一系列地点以提供给您的地图，您需要在从 API 加载地震并分配它们后创建这些地点。使用 @State var 确保您的视图得到更新。

我无法打印我在地图标记上拉出的 api

I can't print the api I pulled on the mapmarker

ios

swift

swiftui