Convert String to Binding<String> in Swift

Question

Most of the solutions I see are partaining to SwiftUI where a string can be passed as a Binding String like this

TextField("", $text)

But in this case, it's purely on Swift... I have this code below

final class Coordinator: NSObject, UITextViewDelegate {
    var text: Binding<String>

    init(text: Binding<String>) {
        self.text = text
    }
    
    func myFunc(){
        let string = "my string" // a dynamically created String
        self.text = string // This throws an error that I cannot assign value type of string to Binding<String>
    }
}

How can I get to convert String to Binding<String>?

Binding is only for SwiftUI Views, it doesn't work in a class, leave it in the parent — lorem ipsum
– lorem ipsum, Commented Jan 30, 2023 at 22:47
This is a custom TextField in SwiftUI, so the other end of the data binding is coming from a SwiftUI page... My purpose of doing this is that I want to be able to edit some of the text as the user is typing and display it back to the user. — KANAYO AUGUSTIN UG
– KANAYO AUGUSTIN UG, Commented Jan 31, 2023 at 5:37
Look into using @Published in a class that conforms to ObservableObject, this is probably what you want. — Joakim Danielson
– Joakim Danielson, Commented Jan 31, 2023 at 7:35

vadian · Accepted Answer · 2023-01-31 08:09:47Z

1

The name Coordinator suggests that we are talking about UIViewRepresentable.

If so the usual way is to declare the Binding in the UIViewRepresentable struct and pass the MyView instance to the coordinator to have access to it

struct MyView: UIViewRepresentable
{
    @Binding var text: String
    
    func makeCoordinator() -> Coordinator {
        return Coordinator(self)
    }
...

final class Coordinator: NSObject, UITextViewDelegate {
    var parent: MyView

    init(_ parent: MyView) {
        self.parent = parent
    }
    
    func myFunc(){
        let string = "my string" // a dynamically created String
        parent.text = string
    }
}

answered Jan 31, 2023 at 8:09

vadian

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