ios - Cannot assign self as delegate in property initializer -

i getting strange error message when try access self when initializing property on class. seems class has weird type.

this error:

cannot assign value of type 'viewcontroller -> () viewcontroller' value of type 'modelcontrollerdelegate?' 

this code, simple example in playground:

import foundation import uikit  protocol modelcontrollerdelegate     {     func modelcontrollerdidfinishtask()     }  class modelcontroller     {     var delegate : modelcontrollerdelegate?     }  class viewcontroller : uiviewcontroller, modelcontrollerdelegate     {     var modelcontroller : modelcontroller =         {         let controller = modelcontroller()         controller.delegate = self         return controller         }()      func modelcontrollerdidfinishtask()         {          }     } 

you trying use self when not initialised. might work if use lazy initialisation:

lazy var modelcontroller : modelcontroller = { ...