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[英]iOS: Make function calls between UIViewRepresentable and View both ways, SwiftUI
[英]Pass data between UIViewRepresentable and SwiftUI
我在我的應用程序中使用谷歌地圖。 該應用程序在 map 上顯示 POI 標記,並在地圖視圖被拖動一定距離時從我的 BE 加載數據。 我想將shoudlRefresh
值傳遞回 ContentView 並要求用戶再次刷新數據。
我已經使用@Binding 在我的 ContentView 和 UIViewRepresentable 之間傳遞數據,但我不能通過 Coordinator 在地圖委托中使用這個@Binding var shouldRefresh
。
如果我嘗試通過協調器init()
將此 @Binding var 傳遞給協調器,我會收到這兩個錯誤
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
只有相關代碼:
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) { }
}
您已對mShouldRefresh
進行雙重綁定
只需更改為
@Binding var mShouldRefresh: Bool
並在 init 里面改變這個
self._mShouldRefresh = refresh
另一種方法是
// Other Code
var owner: MapsView
var mShouldRefresh: Binding<Bool>
init(owner: MapsView, refresh: Binding<Bool>) {
self.owner = owner
self.mShouldRefresh = refresh
}
// Other Code
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