如何在 SwiftUI 中将变量从一个视图传递到另一个视图

我正在尝试将一个变量从一个视图传递到 SwiftUI 中的另一个视图。我有一个重置按钮，我想在另一个视图中将变量设置为零。

我尝试在视图一中创建一个新结构并在视图2中访问该变量。

// View 1

@State var count = MyNumber.number

// Body of app

Button(action: {self.count = self.count-10}) {
                    Text("-")   
                }
Text("\(count)")

struct MyNumber {
    static var number = 0
}

// View 2

 @State var countit = MyNumber.number

// Body

Button(action: {self.countit = 0}) {
            Text("Reset")
            }

视图一中的文本仍显示在视图 1 中计算的数字

If View2正在被用于View1你可以这样做：

View1:

struct FirstView: View {
    @State var count = 0
    var body: some View {
        VStack{
            Text("\(self.count)")
            Button(action:
                {self.count = self.count-10})
            {
                Text("-")
            }
            SecondView(count: self.$count)
        }
    }
}

And View2:

struct SecondView: View {
    @Binding var count: Int
    var body: some View {
        Button(action: {self.count = 0}) {
            Text("Reset")
        }
    }
}

Edit

如果它们是完全不同的视图并且需要单一事实来源，您可以使用 observableObject/EnvironmentVariables。最好的方法是将环境变量添加到ContentView它首先定义在SceneDelegate

ContentView().environmentObject(SourceOfTruth())

这是真相来源：

class SourceOfTruth: ObservableObject{
    @Published var count = 0
}

然后您可以将 EnvironmentObjects 用于其他视图： 这是ContentView:

struct ContentView: View {
    @EnvironmentObject var truth: SourceOfTruth
    var body: some View {
        VStack {
            FirstView()
            SecondView()
        }
    }
}

Here is FirstView:

struct FirstView: View {
    @EnvironmentObject var truth: SourceOfTruth
    var body: some View {
       VStack{
        Text("\(self.truth.count)")
           Button(action:
            {self.truth.count = self.truth.count-10})
           {
               Text("-")
           }
       }
    }
}

Here is SecondView:

struct SecondView: View {
    @EnvironmentObject var truth: SourceOfTruth
    var body: some View {
        Button(action: {self.truth.count = 0}) {
            Text("Reset")
        }
    }
}