Update documentation for creating widgets

user-manual/Advanced/CreatingWidgets.md

@@ -25,29 +25,29 @@ struct CustomText: Widget {
 
     var text: String
 
-    public func container() -> ViewStorage { }
-    public func update(_ storage: ViewStorage) { }
+    public func container(modifiers: [(View) -> View]) -> ViewStorage { }
+    public func update(_ storage: ViewStorage, modifiers: [(View) -> View]) { }
 
 }
 ```
 
-## The `container()` Function
+## The `container(modifiers:)` Function
 This function initializes the widget when the widget appears for the first time.
 It expects a `ViewStorage` as the return type.
 In our case, this function is very simple:
 ```swift
-func container() -> ViewStorage {
+func container(modifiers: [(View) -> View]) -> ViewStorage {
     .init(MarkupLabel(self.text))
 }
 ```
 `MarkupLabel` is defined in [Libadwaita][1].
 
-## The `update(_:)` Function
+## The `update(_:modifiers:)` Function
 Whenever a state of the app changes, the `update(_:)` function of the widget gets called.
 You get the view storage that you have previously initialized as a parameter.
 Update the storage to reflect the current state of the widget:
 ```swift
-func update(_ storage: ViewStorage) {
+func update(_ storage: ViewStorage, modifiers: [(View) -> View]) {
     if let label = storage.view as? MarkupLabel {
         label.setText(text)
     }
@@ -57,7 +57,7 @@ func update(_ storage: ViewStorage) {
 ## Containers
 Some widgets act as containers that accept other widgets as children.
 In that case, use the `ViewStorage`'s `content` property for storing their view storages.
-In the `update(_:)` function, update the children's storages.
+In the `update(_:modifiers:)` function, update the children's storages.
 An example showcasing how to implement containers is the [VStack][2].
 
 [1]:	https://github.com/AparokshaUI/Libadwaita