Swift中多维阵列的存取GrandChild

Question

我有一个多维数组。它就像[["1","2","3"]]，我如何访问"1"？

为了获得更多细节..。

lazy var data : [[NSURL]] = {

        var array = [[NSURL]]()

        if array.count == 0 {

            var index = 0
            var section = 0

            for image in images {
                if array.count <= section {
                    array.append([NSURL]())
                }
                array[section].append(image)

                index += 1

            }
        }
        return array
    }()

使用print(data)，我可以访问：

[["firstUrl", "secondUrl", "thirdUrl"]]

如何访问"first"

Answer 1

你可以这样做：array[0][0]

Answer 2

例如，像这样的枚举：

var dict = [["1","2","3"]]

for (index, item) in dict.enumerate() {
//hear you enumerate []
    for (index, item) in item.enumerate() {
        //hear you enumerate ["1","2","3"]
        print("Found \(item) at position \(index)")
    }
}