Trigger UI update when server changes a form field value (#1483)

* Trigger UI update when server changes a form field value

* Update CHANGELOG

Author: carson-katri

CHANGELOG.md

@@ -21,6 +21,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `liveview-native-core` has been updated to v0.4.0, and is now used for all internal networking
 
 ### Fixed
+- Views will now update properly when the server changes the value of a form field (#1483)
 
 ## [0.3.1] 2024-10-02
 

Sources/LiveViewNative/Property Wrappers/FormState.swift

@@ -276,7 +276,7 @@ private class FormStateData<Value: FormValue>: ObservableObject {
         // When the element updates from the server, sync the new value into the form.
         elementCancellable = element.projectedValue
             .receive(on: DispatchQueue.main)
-            .sink { [weak formModel] _ in
+            .sink { [weak formModel, weak self] _ in
                 // ignore server updates if the field is focused.
                 guard !isFocused.wrappedValue && !isEditing.wrappedValue else { return }
                 formModel?.setServerValue(
@@ -285,6 +285,7 @@ private class FormStateData<Value: FormValue>: ObservableObject {
                         ?? defaultValue,
                     forName: elementName
                 )
+                self?.objectWillChange.send()
             }
 
         // Remove all focus from form fields when the form is submitted.