@propertyWrapper
struct ObjectId {
   var wrappedValue: View? {
       get { return builder.getViewById(id: self.viewId) }
       }
   let viewId: String;
   let builder: Builder;
   init(id: String, _builder: Builder) {
       viewId = id;
       builder = _builder;
   }
}

struct View {
   let id: String;
}
struct Builder {
   func getViewById(id: String) -> View? {
       return View(id: id);
   }
}

struct MyUI {
   static let myBuilder: Builder = Builder();
   @ObjectId(id: "Myid", _builder: myBuilder) var view: View?;
}

let ui: MyUI = MyUI();
print(ui.view!.id);

@propertyWrapper
class ObjectId {
   var wrappedValue: View? {
       get {
           return self.view
       }
   }
   let viewId: String;
   var view: View?
   init(id: String) {
       viewId = id;
   }
}

struct View {
   let id: String;
}
struct Builder {
   let prefixValue: String;
   func getViewById(id: String) -> View? {
       return View(id: prefixValue + id);
   }
}

struct MyUI {
   @ObjectId(id: "MyRootView") var view: View?;
   @ObjectId(id: "MyLabel") var label: View?;
   @ObjectId(id: "MyButton") var button: View?;

   init() {
       let builder: Builder = Builder(prefixValue: "Builder");
       let mirror = Mirror(reflecting: self)
       for c in mirror.children {
           if let objid = c.value as? ObjectId {
               let v = builder.getViewById(id: objid.viewId)
               objid.view = v
           }
       }

   }
}

let ui: MyUI = MyUI();
let mirror = Mirror(reflecting: ui)
for case let (label?, value) in mirror.children {
   if let v = value…