SwiftUI TextField with formatter not working?

Question

I\'m trying to get a numeric field updated so I\'m using a TextField with the formatter: parameter set. It formats the number into the entry field just fine, but does not up

Answer 1

You can use Binding to convert Double<-->String for TextField

struct TestView: View {
    @State var someNumber = 123.0

    var body: some View {
        let someNumberProxy = Binding(
            get: { String(format: "%.02f", Double(self.someNumber)) },
            set: {
                if let value = NumberFormatter().number(from: $0) {
                    self.someNumber = value.doubleValue
                }
            }
        )

        return VStack {
            TextField("Number", text: someNumberProxy)

            Text("number: \(someNumber)")
        }
      }
}

You can use computed property way to solve this issue. (thanks @ iComputerfreak)

struct TestView: View {
    @State var someNumber = 123.0

    var someNumberProxy: Binding {
        Binding(
            get: { String(format: "%.02f", Double(self.someNumber)) },
            set: {
                if let value = NumberFormatter().number(from: $0) {
                    self.someNumber = value.doubleValue
                }
            }
        )
    }

    var body: some View {
        VStack {
            TextField("Number", text: someNumberProxy)

            Text("number: \(someNumber)")
        }
      }
}