Update Example

Author: dungntm58

Example/FormHookExample/ContentView.swift

@@ -35,8 +35,14 @@ struct ContentView: View {
 
     @FocusState var focusField: FormFieldName?
 
+//    func onFocusField(_ field: FormFieldName) {
+//        focusField = field
+//    }
+    
     @ViewBuilder
     var body: some View {
+//      Pass an onFocusField closure
+//      ContextualForm(onFocusField: onFocusField(_:)) {}
         ContextualForm(focusedFieldBinder: $focusField) { form in
             Form {
                 Section("Name") {

Sources/FormHook/Controller.swift

@@ -22,6 +22,7 @@ public struct FieldOption<FieldName, Value> {
 public typealias ControllerRenderOption<FieldName, Value> = (field: FieldOption<FieldName, Value>, fieldState: FieldState, formState: FormState<FieldName>) where FieldName: Hashable
 
 public struct Controller<Content, FieldName, Value>: View where Content: View, FieldName: Hashable {
+    let form: FormControl<FieldName>?
     let name: FieldName
     let defaultValue: Value
     let rules: any Validator<Value>
@@ -31,6 +32,7 @@ public struct Controller<Content, FieldName, Value>: View where Content: View, F
     let render: (ControllerRenderOption<FieldName, Value>) -> Content
 
     public init(
+        form: FormControl<FieldName>? = nil,
         name: FieldName,
         defaultValue: Value,
         rules: any Validator<Value> = NoopValidator(),
@@ -39,6 +41,7 @@ public struct Controller<Content, FieldName, Value>: View where Content: View, F
         fieldOrdinal: Int? = nil,
         @ViewBuilder render: @escaping (ControllerRenderOption<FieldName, Value>) -> Content
     ) {
+        self.form = form
         self.name = name
         self.defaultValue = defaultValue
         self.rules = rules
@@ -50,7 +53,7 @@ public struct Controller<Content, FieldName, Value>: View where Content: View, F
 
     public var body: some View {
         HookScope {
-            let renderOption = useController(name: name, defaultValue: defaultValue, rules: rules, shouldUnregister: shouldUnregister, unregisterOption: unregisterOption, fieldOrdinal: fieldOrdinal)
+            let renderOption = useController(form: form, name: name, defaultValue: defaultValue, rules: rules, shouldUnregister: shouldUnregister, unregisterOption: unregisterOption, fieldOrdinal: fieldOrdinal)
             render(renderOption)
         }
     }

Sources/FormHook/Hook/UseController.swift

@@ -9,14 +9,15 @@ import Foundation
 import Hooks
 
 public func useController<FieldName, Value>(
+    form: FormControl<FieldName>? = nil,
     name: FieldName,
     defaultValue: Value,
     rules: any Validator<Value>,
     shouldUnregister: Bool = true,
     unregisterOption: UnregisterOption = [],
     fieldOrdinal: Int? = nil
 ) -> ControllerRenderOption<FieldName, Value> where FieldName: Hashable {
-    let form = useContext(Context<FormControl<FieldName>>.self)
+    let form = form ?? useContext(Context<FormControl<FieldName>>.self)
     let registration = form.register(name: name, options: RegisterOption(fieldOrdinal: fieldOrdinal, rules: rules, defaultValue: defaultValue, shouldUnregister: shouldUnregister))
 
     let preservedChangedArray = [

Sources/FormHook/Hook/UseForm.swift

@@ -15,7 +15,7 @@ public func useForm<FieldName>(
     resolver: Resolver<FieldName>? = nil,
     context: Any? = nil,
     shouldUnregister: Bool = true,
-    shouldFocusError: Bool,
+    shouldFocusError: Bool = true,
     delayErrorInNanoseconds: UInt64 = 0,
     @_implicitSelfCapture onFocusField: @escaping (FieldName) -> Void
 ) -> FormControl<FieldName> where FieldName: Hashable {