对角线循环通过 2D 数组

Question

我正在编写一个函数，该函数应该通过对角线（左上角到右下角）循环二维数组。但是，代码不会添加到外部 while 循环（i），它保持为 0。arr 是 9X9

    var i = 0
    var j = 0

    while(i < arr.count-1){
        while (j < arr.count-1) {


            print("i = \(i) --- j = \(j)")
            if(i == j){

                sumDiagonalLeft += arr[j][i]

                print(sumDiagonalLeft)

                if(arr[j][i] == 1){
                    informationUsed += 1
                    arr[i][j] = 2
                }
            }

         j += 1

        }
        i += 1
    }

感谢您的宝贵时间:)

Answer 1

试试这个，

var array:[[Int]] = []

array.append([1,2,3,4,5,6,7,8,9])
....
array.append([1,2,3,4,5,6,7,8,9])

for (index, element) in array.enumerated(){
    for (innerIndex,innerElement) in element.enumerated(){
        print(innerElement) // you can do your logics here 
    }
}