在 UIViewRepresentable 和 SwiftUI 之间传递数据

Question

我在我的应用程序中使用 Google 地图。当地图视图被拖动一定距离时，该应用程序在地图上显示 POI 标记并从我的 BE 加载数据。我想将 shoudlRefresh 值传回 ContentView 并要求用户再次刷新数据。

我已经使用@Binding 在我的 ContentView 和 UIViewRepresentable 之间传递数据，但是我不能在通过 Coordinator 的地图委托中使用这个 @Binding var shouldRefresh。

如果我尝试通过协调器 init() 将此 @Binding var 传递给协调器，我会收到这两个错误

at POINT A -> Property 'self.mShouldRefresh' not initialized at implicitly generated super.init call  

at POINT B -> self' used in property access 'mShouldRefresh' before 'super.init' call

仅相关代码：

struct MapsView: UIViewRepresentable {

       @Binding var shouldRefresh: Bool

func makeUIView(context: Context) -> GMSMapView
func updateUIView(_ mapView: GMSMapView, context: Context)  

{
    func makeCoordinator() -> Coordinator {
   Coordinator(owner: self, refresh: $shouldRefresh)
}

class Coordinator: NSObject, GMSMapViewDelegate {
    
    let owner: MapsView
    @Binding var mShouldRefresh: Binding<Bool>
    
    var startPoint : CLLocationCoordinate2D?
    var startRadius : Double?
    
    init(owner: MapsView, refresh: Binding<Bool>) { //  POINT A
        self.owner = owner
        self.mShouldRefresh = refresh // POINT B
    }
    
    func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition) { }
}

Answer 1

您已对 mShouldRefresh

进行双重绑定

改成

@Binding var mShouldRefresh: Bool

并在 init 内部更改此

self._mShouldRefresh = refresh

另一种方式是

// Other Code
var owner: MapsView
var mShouldRefresh: Binding<Bool>

init(owner: MapsView, refresh: Binding<Bool>) {
    self.owner = owner
    self.mShouldRefresh = refresh
}
// Other Code

在 UIViewRepresentable 和 SwiftUI 之间传递数据

Pass data between UIViewRepresentable and SwiftUI

google-maps

ios

swift

swiftui