How to turn a String to a Binding<String>

Question

Created Jan ’21

Replies 3

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I'm sorta new to swiftUI, and I don't fully know how stuff like @Binding and @State work, but I have a view that changes a text from a variable passed to the view through:

Code Block @Binding var str: String

A simple example of this would be:

Code Block struct TextView: View {
  @Binding var str: String
  var body: some View {
    Text($str.wrappedValue)
  }
}

Though when I try to send a string when I call the view it gives me the error: Cannot convert the value of type 'String' to expected argument type 'Binding<String>

I have tried to figure out how to turn a String to a Binding<String> but I cant figure it out.

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Answer 1

Apfelgruen OP

Jan ’21

I do not know so much of SwiftUI but try to replace @Binding with @State
may be that could help.

0

Answer 2

OOPer OP

Jan ’21

when I try to send a string when I call the view

Please show the code.

By the way, $str.wrappedValue is equivalent to str, when str is an @Binding.

0

Answer 3

Claude31 OP

Jan ’21

Here is an example of several ways to pass parameters:

Code Block import SwiftUI
struct DestView: View {
    var body: some View {
        Text("Hello, Destination!")
    }
}
struct DestViewState: View {
    @State var theState: Int = 0
    @State var theStateStr: String = "hello"
    var body: some View {
        Text("Hello, Destination! \(theState) \(theStateStr)")
    }
}
struct DestViewStateBinding: View {
    @Binding var theStateBinding: Int
    @Binding var theStateStrBinding: String
    var body: some View {
        if theStateBinding < 50 { theStateBinding += 10 }
        return Text("Hello, Destination! \(theStateBinding) \(theStateStrBinding)")
    }
}
struct ContentView: View {
    var contentNoState : Int = 1
    @State var contentState : Int = 1
    @State var contentStateStr: String = "hello you"
    var body: some View {
        NavigationView {
            VStack {
                Text("Hello, World!")
                Spacer()
                NavigationLink(destination: DestView()) {
                    Text("Press on me")
                }.buttonStyle(PlainButtonStyle())
                Spacer()
                NavigationLink(destination: DestViewState(theState: contentNoState, theStateStr: "Modified hello")) {@// You can skip parameters as they are initialized in the struct
                    Text("Press on me with State")
                }.buttonStyle(PlainButtonStyle())
                Spacer()
                NavigationLink(destination: DestViewStateBinding(theStateBinding: $contentState, theStateStrBinding: $contentStateStr)) {
                    Text("Press on me with Binding")
                }.buttonStyle(PlainButtonStyle())
            }
        }
    }
}
struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

0