SwiftExtension // Make AppProperty bindable.

Packages/vChewing_SwiftExtension/Sources/SwiftExtension/SwiftExtension.swift

@@ -115,7 +115,7 @@ extension Bool {
   }
 }
 
-// MARK: - Property wrapper
+// MARK: - Property Wrapper
 
 // Ref: https://www.avanderlee.com/swift/property-wrappers/
 

Packages/vChewing_SwiftExtension/Sources/SwiftExtension/SwiftUIExtension.swift

@@ -156,3 +156,19 @@ public struct TextEditorEX: NSViewRepresentable {
     }
   }
 }
+
+// MARK: - Property Wrapper (Bindable Extension)
+
+extension AppProperty {
+  @available(macOS 10.15, *)
+  public var projectedValue: Binding<Value> {
+    .init(
+      get: {
+        container.object(forKey: key) as? Value ?? defaultValue
+      },
+      set: {
+        container.set($0, forKey: key)
+      }
+    )
+  }
+}