SwiftUI Textfields and Ints

Question

I started today to use SwiftUI an I want to code a small calculator. Therefore I want a textfield where the user can write a number. But the usual textfields only accepts strings what can I do ?

Are you asking how to convert a string to Int? Because "usual textfields" accept numbers as well, just as a string, not int. You will need to convert the string to an int by `Int(myString)`, for example. — Cuneyt, Nov 05 '20 at 21:57
Does this answer your question? [SwiftUI - How to create TextField that only accepts numbers](https://stackoverflow.com/questions/58733003/swiftui-how-to-create-textfield-that-only-accepts-numbers) — pawello2222, Nov 06 '20 at 00:01

score 0 · Answer 1 · answered Nov 05 '20 at 21:00

0

If you want to force the TextField keyboard to be numeric, just do this:

TextField("Input", text: $input)
    .keyboardType(.decimalPad)

where the keyboardType is a UIKeyboardType.

answered Nov 05 '20 at 21:00

NRitH

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You still can *paste* some text with this solution. – pawello2222 Nov 06 '20 at 00:02

workingdog support Ukraine · Answer 2 · 2020-11-07T00:27:35.347

with SwiftUI 2.0 you could use something like this:

struct ContentView: View {
@State var theInt: Int?
@State var text = ""

var body: some View {
    VStack {
        TextField("enter a number", text: $text)
            .onChange(of: text) {
              let txt = $0.filter { "-0123456789".contains($0) }
              if allowed(txt) {
                 theInt = Int(txt)
                 text = txt
              } else {
                text = String(txt.dropLast())
              }
            }
    }
}

func allowed(_ str: String) -> Bool {
    let num = str.starts(with: "-") ? String(str.dropFirst()) : str
    return CharacterSet.decimalDigits.isSuperset(of: CharacterSet(charactersIn: num))
}
}

SwiftUI Textfields and Ints

2 Answers2