在UIViewRepresentable和SwiftUI之间传递数据

Question

我在应用程序中使用谷歌地图。当地图视图被拖动一定距离时，该应用程序会在地图上显示POI标记，并从我的BE加载数据。我想将shoudlRefresh值传递回ContentView，并要求用户再次刷新数据。

我已经使用@Binding在ContentView和UIViewRepresentable之间传递数据，但我不能通过Coordinator在映射委托中使用此@Binding var shouldRefresh。

如果我试图通过协调器init()将@Binding var传递给协调器，我会得到这两个错误

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

您已经对mShouldRefresh进行了双重绑定

只需更改为

@Binding var mShouldRefresh: Bool

在init内部更改这个

self._mShouldRefresh = refresh

---

---

另一种方法是

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