Add onAppear event for SpiceStore

Examples/SwiftUIExample/AppSpiceStore.swift

@@ -22,6 +22,11 @@ final class AppSpiceStore: SpiceStore {
     }
     .padding()
     @Spice var version = LabeledContent("Version", value: "1.0 (1)")
+    @Spice var userId: String = "Not loaded"
+
+    func onAppear() {
+        userId = "\(Int.random(in: 0...100))"
+    }
 }
 
 final class DebuggingSpiceStore: SpiceStore {

Examples/UIKitExample/AppSpiceStore.swift

@@ -25,8 +25,13 @@ final class AppSpiceStore: SpiceStore {
     }
     .padding()
     @Spice var version = LabeledContent("Version", value: "1.0 (1)")
+    @Spice var userId: String = "Not loaded"
 
     private init() {}
+
+    func onAppear() {
+        userId = "\(Int.random(in: 0...100))"
+    }
 }
 
 final class DebuggingSpiceStore: SpiceStore {

Sources/Spices/SpiceEditor.swift

@@ -68,6 +68,9 @@ public struct SpiceEditor: View {
             MenuItemListView(items: spiceStore.menuItems, title: title) {
                 dismiss()
             }
+            .onAppear {
+                spiceStore.onAppear()
+            }
         }
         .configureSheetPresentation()
         .environmentObject(UserInteraction())

Sources/Spices/SpiceStore.swift

@@ -33,12 +33,18 @@ public protocol SpiceStore: AnyObject, ObservableObject {
     ///
     /// The default implementation returns `UserDefaults.standard`.
     var userDefaults: UserDefaults { get }
+
+    /// Call when the store appear on the screen
+    func onAppear()
 }
 
 public extension SpiceStore {
     var userDefaults: UserDefaults {
         .standard
     }
+
+    func onAppear() {
+    }
 }
 
 public extension SpiceStore {