我如何计算和初始化init的“ content”属性？ 迅速

Question

I am trying to initialize content property by using setupForNewGame() method where I passed two properties, but I want to use computed property, how can I do it?

class Grid{
   private var content: [[Int?]]
   init(width: Int, height: Int){
      content = Grid.setupForNewGame(width: width, height: height)
   }
   class func setupForNewGame(width: Int,height: Int)->[[Int]]{
      return ...
   }
}

Answer 1

Simply create properties for width and height in class Grid . In the init(width:height:) set values for these properties.

Create content as computed property that returns the result of setupForNewGame(width:height:) method using the above created width and height properties.

class Grid {
    let width: Int
    let height: Int

    var content: [[Int]] { //this is a computed property.....
        return Grid.setupForNewGame(width: self.width, height: self.height)
    }

    init(width: Int, height: Int) {
        self.width = width
        self.height = height
    }

    class func setupForNewGame(width: Int, height: Int) -> [[Int]] {
        return ...
    }
}

Usage:

let grid = Grid(width: 3, height: 3)
print(grid.content) //prints the result returned from `setupForNewGame(width:height:)` method using width = 3 and height = 3