arrays - 如何用自定义对象填充二维数组？ swift

Question

我试图在我有网格板和像 Fish 和 Orca 这样的角色的地方制作项目。我创建了 Animal 父类和两个继承动物的子类。我想用 5% Orca 和 35% Fish 填充板 (n * m)。我怎样才能用逆戟鲸和鱼填满网格？在这里，我尝试用数字填充黑板。

class Animal {


}
class Fish: Animal{
}
class Orca:Animal{
}
class Board{
private var content: [[Int?]]
private static func setupForNewGame(width: Int,height: Int)->[[Int]]{

    var matrix:[[Int]] = Array(repeating: Array(repeating: 0, count: width), count: height)
    let cellCount = width * height

    var penguinCount = Double(round(Double(cellCount) * 50.0 / 100.0))
    var grampusCount = Double(round(Double(cellCount) * 5.0 / 100.0))

    var arr:[Int] = Array(repeating: 0, count: cellCount)
    for i in 0...cellCount - 1{
        if (penguinCount > 0){
            arr[i] = 1
            penguinCount = penguinCount - 1
        }else if (grampusCount > 0){
            arr[i] = 2
            grampusCount = grampusCount - 1
        }else{
            arr[i] = 0
        }
    }
    let shuffledArr = arr.shuffled()
    var counter = 0
    for i in 0...width - 1{
        for j in 0...height - 1{
           matrix[i][j] = shuffledArr[counter]
            counter = counter + 1
        }

    }

    return matrix

}
}

Answer 1

声明 [[Animal?]] 类型的 matrix 数组并使用 nil 而不是 0

class Board {
    private var content: [[Animal?]] = []
    private static func setupForNewGame(width: Int,height: Int)->[[Animal?]] {

        var matrix:[[Animal?]] = Array(repeating: Array(repeating: nil, count: width), count: height)
        let cellCount = Double(width * height)

        let fishCount = Int(cellCount * 35.0 / 100.0)
        let orcaCount = Int(cellCount * 5.0 / 100.0)

        var arr:[Animal?] = Array(1...fishCount).map { _ in Fish() } + Array(1...orcaCount).map { _ in Orca() } + Array(repeating: nil, count: Int(cellCount)-fishCount-orcaCount)
        arr = arr.shuffled()

        var counter = 0
        for i in 0...width - 1{
            for j in 0...height - 1{
                matrix[i][j] = arr[counter]
                counter = counter + 1
            }
        }
        return matrix
    }
}