UITextField not updating to change in ObservableObject (SwiftUI) - swiftui

Question

I am trying to make a UITextView that edits a value currentDisplayedAddress. The value is also changed by other views, and I want the UITextView to update its text when that occurs.
The view initializes correctly, and I can edit currentDisplayedAddress from AddressTextField with no problem and trigger relevant view updates. However, when the value is changed by other views, the textField's text does not change, even though textField.text prints the correct updated value inside updateUIView and other views update accordingly.
I have no idea what may have caused this. Any help is extremely appreciated.
struct AddressTextField: UIViewRepresentable {
private let textField = UITextField(frame: .zero)
var commit: () -> Void
#EnvironmentObject var userData: UserDataModel
func makeUIView(context: UIViewRepresentableContext<AddressTextField>) -> UITextField {
textField.text = self.userData.currentDisplayedAddress
textField.delegate = context.coordinator
return textField
}
func updateUIView(_ uiView: UITextField, context: UIViewRepresentableContext<AddressTextField>) {
if self.textField.text != self.userData.currentDisplayedAddress {
DispatchQueue.main.async {
self.textField.text = self.userData.currentDisplayedAddress
}
}
}
(...)
func makeCoordinator() -> Coordinator { Coordinator(self) }
class Coordinator: NSObject, UITextFieldDelegate {
var addressTextField: AddressTextField
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
addressTextField.userData.currentDisplayedAddress = textField.text ?? String()
addressTextField.commit()
return true
}
}
}

Answer 1

You should not create UITextField as property, because AddressTextField struct can be recreated during parent update. The makeUIView is exactly the place to create UI-instances, the representable is handling its reference on your behalf.
So here is fixed variant. Tested with Xcode 11.4 / iOS 13.4
struct AddressTextField: UIViewRepresentable {
var commit: () -> Void = {}
#EnvironmentObject var userData: UserDataModel
func makeUIView(context: UIViewRepresentableContext<AddressTextField>) -> UITextField {
let textField = UITextField(frame: .zero)
textField.text = self.userData.currentDisplayedAddress
textField.delegate = context.coordinator
return textField
}
func updateUIView(_ textField: UITextField, context: UIViewRepresentableContext<AddressTextField>) {
if textField.text != self.userData.currentDisplayedAddress {
textField.text = self.userData.currentDisplayedAddress
}
}
func makeCoordinator() -> Coordinator { Coordinator(self) }
class Coordinator: NSObject, UITextFieldDelegate {
var addressTextField: AddressTextField
init(_ addressTextField: AddressTextField) {
self.addressTextField = addressTextField
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool { //delegate method
textField.resignFirstResponder()
addressTextField.userData.currentDisplayedAddress = textField.text ?? String()
addressTextField.commit()
return true
}
}
}