assign value to a bool if contains statement is true

Question

dtos11 OP

Created Apr ’22

Replies 1

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Participants 2

I'd like to make a boolean var true if a string var contains a comma. but keep getting an error

import SwiftUI

struct ContentView: View { @State var dos = "" @State var coma : Bool = false var body: some View { Form { TextField("dosis", text: $dos) if dos.contains(",") == true{ coma == true } } } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } }

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Answer 1

Claude31 OP

Apr ’22

You cannot use if in such a way in SwiftUI.

But you can react to change:

struct ContentView: View {
    @State var dos = ""
    @State var coma : Bool = false
    var body: some View {
        Form {
            TextField("dosis", text: $dos)
                .onChange(of: dos, perform: { _ in
                    if dos.contains(",") {
                        coma = true
                    }
                })
//            if dos.contains(",") == true {
//                coma == true
//            }
        }
    }
}

Or apply modifier to Form:

struct ContentView: View {
    @State var dos = ""
    @State var coma : Bool = false
    var body: some View {
        Form {
            TextField("dosis", text: $dos)
        }
        .onChange(of: dos, perform: { _ in
            if dos.contains(",") {
                coma = true
                print("Changed")
            }
        })
    }
}

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