TextField not updating

Question

Created Mar ’20

Replies 2

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Participants 3

the following code loads fine, the text and the double field both show 300. however when I click submit the text only changes to 0. you will see in the print output that the init was called with the new value of 0 but it does not update the double field? any suggestions?

import SwiftUI

struct ContentView: View {
  @State var amount:Double = 300
  var body: some View {
  VStack {
  Text("\(self.amount)")
  DoubleField(value: $amount)
  Button(action: {self.amount=0}) {Text("Submit")}
  }
  .padding()
  .frame(maxWidth: .infinity, maxHeight: .infinity)
  }
}

struct DoubleField:View {

  @Binding var doubleValue:Double
  @State var stringValue:String

  init(value: Binding) {
  print("DoubleField.init(value: \(value.wrappedValue))")
  self._doubleValue = value
  self._stringValue = State(initialValue: "\(value.wrappedValue)")
  }

  var body: some View {
  TextField("0.00", text: $stringValue)
  }

}

Boost

Answer 1

poya OP

Mar ’20

Instead of introducing the additional stringValue state property and trying to keep that in sync with the doubleValue binding you can utilize the doubleValue binding directly in the textfield with a formatter to do the double to string conversion

TextField("0.00", value: $doubleValue, formatter: NumberFormatter())

0

Answer 2

SuRao OP

Apr ’21

https://stackoverflow.com/a/67311876/15743514

0