TextField gives error message

Question

SilkSound OP

Created Apr ’24

Replies 2

Boosts 0

Participants 2

It is driving me crazy, because I really don't know what I am doing wrong. I have a observable class:

@Observable class Variables: Identifiable { var id: UUID() var xValue: Int = 1 var yValue: Int = 1 }

And a main view that calls a Subview to set the variables, using environment to set variables to the Subview, because this is a very simplified code example and in the final code lot more subview are gonna use this data.

struct MainView: View {

@State var vars = Variables()

var body: Some View {

      VStack {

             Subview()

                 .environment(vars)
                 .padding()
             Text("Value X = \($vars.xValue)")
             Text("Value Y = \($vars.yValue)")
      }

}

struct Subview: View {

@Environment(Variables.self) private var vars

var body: Some View {

       VStack {
          TextField("xValue", value $vars.xValue, format: .number) {
                Text("X")
                }
          TextField("yValue", value $vars.yValue, format: .number) {
                Text("Y")
                }
       }

}

I Get this error for the TextFields:

Cannot convert value of type 'Int' to expected argument type 'Binding<V>'

I just don't get it. Am I mixing up different kind of bindings, is something wrong in the definition of TextField..........................................

Please help me.

Answered by SilkSound in 785946022

I actually did type it in directly and wasn't much bothered by the accuracy of it. But I missed the @Binding part of the code. I assumed the variable being an environmental value is automatically bound. Apparently not. I know it was a stupid question, but I coded a fair bit of cocoa interfaces and am still struggling to get an understanding of SwiftUI.

So, thank you very much for your help

Boost

Answer 1

Claude31 OP

Apr ’24

Is it the real code or did you type it here ?

I noticed several errors:

var id: UUID()

soudé be

var id = UUID()

var body: Some View {

should be

var body: some View {

What is this closure after TextField (it is only supported in MacOS: https://stackoverflow.com/questions/58776561/add-label-to-swiftui-textfield):

            TextField("xValue", value: $vars.xValue, format: .number) {
                Text("X")
            }

So here is a code that works and that is properly formatted with code formatter.

If that's OK, please close the thread by marking this answer as correct. Otherwise explain what's the problem.

@Observable class Variables: Identifiable {
    var id = UUID() // <<-- Changed here
    var xValue: Int = 1
    var yValue: Int = 1
}

struct MainView: View {
    @State var vars = Variables()
    
    var body: some View {
        VStack {
            Subview()
                .environment(vars)
                .padding()
            Text("Value X = \(vars.xValue)")    // No $vars here
            Text("Value Y = \(vars.yValue)")
        }
    }
}
    
struct Subview: View {
    @Environment(Variables.self) private var vars

    var body: some View {
        @Bindable var vars = vars   // <<-- Added here // https://developer.apple.com/documentation/swiftui/bindable

        VStack {
            HStack {
                Text("X")
                TextField("xValue", value: $vars.xValue, format: .number) /*{ Text("X") }*/  // <<-- Changed here
                    .textFieldStyle(.roundedBorder)
            }
            HStack {
                Text("Y")
                TextField("yValue", value: $vars.yValue, format: .number) /*{ Text("Y") }*/
                    .textFieldStyle(.roundedBorder)
            }
        }
    }
}

0

Answer 2

SilkSound OP

Apr ’24

Accepted Answer

I actually did type it in directly and wasn't much bothered by the accuracy of it. But I missed the @Binding part of the code. I assumed the variable being an environmental value is automatically bound. Apparently not. I know it was a stupid question, but I coded a fair bit of cocoa interfaces and am still struggling to get an understanding of SwiftUI.

So, thank you very much for your help

0