Cannot convert value of type 'Object.Type' to expected argument type 'Object'-CodePudding

I am a newbie to Swift so I apologize if this is dumb question. I am trying to allocate an object and pass it the parent's self.

What I have is like:

  class Maze { 
      var rat : MazeRat 

      init () {
        
        rat = MazeRat(self: Maze)
    }

  }

and

class MazeRat{
     init( maze : Maze ) {
        
    }
}

But XCode objects to "self" in the call, insisting it should be 'maze'. But if that change is made I get the error:

  Cannot convert value of type 'Maze.Type' to expected argument type 'Maze'

TIA for any help.

CodePudding user response：

You should refer to the current instance of Maze as self.

Notice in each example the use of the unowned or weak keywords here, to prevent a strong reference between Maze and MazeRat.

However, since self isn't available yet as rat hasn't been initialized - you need to give rat an initial value first.

Example:

class Maze {
    private(set) var rat: MazeRat!

    init() {
        rat = nil
        rat = MazeRat(maze: self)
    }
}

class MazeRat {
    unowned let maze: Maze

    init(maze: Maze) {
        self.maze = maze
    }
}

Another method is to initialize MazeRat, then set the maze instance, like so:

class Maze {
    let rat: MazeRat

    init() {
        rat = MazeRat()
        rat.maze = self
    }
}

class MazeRat {
    weak var maze: Maze?

    init() {}
}