Extend SwiftUI Keyboard with Custom Button

Question

I\'m trying to find a way to add a key or button to the SwiftUI numberPad. The only references I have found say it is not possible. In the Swift world I added a toolbar with

Answer 1

If there is an issue with @Binding implement the Coordinator class which conforms to the UITextFieldDelegate. This will allow one to be able to customize the TextField further if required.

struct DecimalTextField: UIViewRepresentable {
     private var placeholder: String
     @Binding var text: String

     init(_ placeholder: String, text: Binding) {
        self.placeholder = placeholder
        self._text = text
     } 

     func makeUIView(context: Context) -> UITextField {
        let textfield = UITextField()
        textfield.keyboardType = .decimalPad
        textfield.delegate = context.coordinator
        textfield.placeholder = placeholder
        let toolBar = UIToolbar(frame: CGRect(x: 0, y: 0, width: textfield.frame.size.width, height: 44))
        let doneButton = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(textfield.doneButtonTapped(button:)))
        toolBar.items = [doneButton]
        toolBar.setItems([doneButton], animated: true)
        textfield.inputAccessoryView = toolBar
        return textfield
     }

     func updateUIView(_ uiView: UITextField, context: Context) {
        uiView.text = text
     }

     func makeCoordinator() -> Coordinator {
        Coordinator(self)
     }

     class Coordinator: NSObject, UITextFieldDelegate {
        var parent: DecimalTextField
    
     init(_ textField: DecimalTextField) {
        self.parent = textField
     }
    
     func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
         if let currentValue = textField.text as NSString? {
             let proposedValue = currentValue.replacingCharacters(in: range, with: string) as String
             self.parent.text = proposedValue
         }
         return true
     }
   }
 }