Sherstyuk's questions

问题是将 ViewModel 的结果传递给任何 View

我的模特

    struct ItemsModel: Codable {
    
    var item1: String = ""
    var item2: String = ""
}

看法

    struct ContentView: View {
    
    @ObservedObject var resultViewModel = CalcViewModel()
    @State var isResultView: Bool = false
    
    var body: some View {
        NavigationView {
            Form {
                Section(header: Text("Ввод значения")) {
                    TextField("Введите число", text: $resultViewModel.itemModel.item1)
                    TextField("Введите число", text: $resultViewModel.itemModel.item2)
                }
                Section (header: Text("Ответ")) {
                    Text("\(resultViewModel.resultCalc())")
                }
                
                Button(action: {
                    self.isResultView.toggle()
                }, label: {
                    Text("Рассчитать")
                })
            }
            .sheet(isPresented: $isResultView) {
                        ResultView()
                    }
            .navigationBarTitle(Text("Calculate"))
        }
    }
}

视图模型

    class CalcViewModel: ObservableObject {
    
    @Published var itemModel = ItemsModel()
    
    var item1Double: Double {
        return Double(itemModel.item1) ?? 0
    }
    
    var item2Double: Double {
        return Double(itemModel.item2) ?? 0
    }
    
    func resultCalc() -> Double {
        
        let resultDouble = item1Double + item2Double
        print("👉 \(resultDouble)")
        
        return resultDouble
    }
}

查看将结果传递到哪里

    struct ResultView: View {
    
    @StateObject var vm = CalcViewModel()
    
    var body: some View {
        Text("Ответ: \(vm.resultCalc())")
    }
}

地图中心有一个红色十字准线，我需要获取这个十字准线所在的坐标，并在 Text 中显示出来。

有猜测是这样的

func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
            
            let currentLocation = mapView.centerCoordinate
                    print("👉 Координаты \(currentLocation)")

}

项目链接