Arrays 如何用自定义对象填充二维数组？敏捷的

我试着做一个有网格板和像鱼和虎鲸这样的角色的项目。我创建了Animal父类和继承Animal的两个子类。我想用5%的虎鲸和35%的鱼填充木板（n*m）。我怎样才能用虎鲸和鱼来填充网格？在这里，我试着在黑板上填上数字

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

}
}

---

声明类型为

[[Animal？]

的

矩阵

数组，并使用

nil

代替

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
    }
}

---

声明类型为

[[Animal？]

的

矩阵

数组，并使用

nil

代替

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
    }
}

---

要用自定义对象填充二维数组，需要注意：

0…width-1

最好在Swift中写为

0..

。要用自定义对象填充二维数组，需要注意：

0…width-1

最好在Swift中写为

0..

。

arr

没有足够的项来填充数组

矩阵

因为它只有原来的40%。@vacawama是的。其他元素将为零，但当你填充矩阵时，元素是否会用尽，从而导致索引超出范围错误？现在你的生物在矩阵的开头被卡住了。在

arr

中放入足够多的nil并将其洗牌如何？OP的

arr

在洗牌之前有

width*height

元素，所以足够用均匀分布的动物填充

矩阵。
arr
没有足够的项目填充
矩阵，因为它只有40%大。@vacawama是的。其他元素将为零，但当你填充矩阵时，元素是否会用尽，从而导致索引超出范围错误？现在你的生物在矩阵的开头被卡住了。在
arr
中放入足够的nil并将其洗牌如何？OP的
arr
洗牌前有
width*height
元素，因此足以用均匀分布的动物填充
matrix
。