How to pass a FocusState variable to other views and allow those views to update the variable? [Swif-CodePudding

Currently, I have something like the following:

struct ViewA: View {
    @FocusState private var focusedField: Bool
    var body: some View {
        ViewB(focusedField: $focusedField)
        // some other views that read focusedField...
    }
}


struct ViewB: View {
    @State var focusedField: FocusState<Bool>.Binding
    var body: some View {
        Button(action: {
            focusedField = true   // ERROR: Cannot assign value of type 'Bool' to type 'FocusState<Bool>'
        })
        // ...
    }
}

Seems like I can pass down focusedField with no problem but unable to update its value. How to solve this?

CodePudding user response：

Instead of directly setting focusedField, use the wrappedValue property.

struct ViewA: View {
    @FocusState private var focusedField: Bool
    var body: some View {
        ViewB(focusedField: $focusedField)
        // some other views that read focusedField...
    }
}


struct ViewB: View {
    var focusedField: FocusState<Bool>.Binding
    var body: some View {
        Button(action: {
            focusedField.wrappedValue = true /// assign `wrappedValue`
        }) {
            Text("Click me!") /// Side note: you need a label for the button too, otherwise your code won't compile
        }
        // ...
    }
}

CodePudding user response：

For consistency, maybe it's better to use the property wrapper @FocusedState.Binding instead.

struct ViewA: View {
    @FocusState private var focusedField: Bool
    var body: some View {
        ViewB(focusedField: $focusedField)
        // some other views that read focusedField...
    }
}

struct ViewB: View {
    @FocusState.Binding var focusedField: Bool
    var body: some View {
        Button(action: {
            focusedField = true
        }) {
            Text("Tap me")
        }
    }
}

This allows to do focusedField = true instead of focusedField.wrappedValue = true