Question

例如，我想要数组

["ABC", "ADE", "BCD", "HYD", "ZYX", "ZZZ"]

转换为：

[
    ["ABC", "ADE"],
    ["BCD"],
    ["HYD"],
    ["ZYX", "ZZZ"],
]

那我怎么能做到这一点？谢谢！

Answer 1

使用你的数组创建一个中间字典，将首字母映射到以该字母开头的字符串数组，然后从字典中创建最终数组：

let arr = ["ABC", "ADE", "BCD", "HYD", "ZYX", "ZZZ"]

var dict = [Character:[String]]()

for str in arr {
    if let first = str.characters.first {
        dict[first] = (dict[first] ?? []) + [str]
    }
}

print(dict) // ["H": ["HYD"], "B": ["BCD"], "A": ["ABC", "ADE"], "Z": ["ZYX", "ZZZ"]] 

let arr2 = dict.keys.sort().map { dict[$0]! }
print(arr2) // [["ABC", "ADE"], ["BCD"], ["HYD"], ["ZYX", "ZZZ"]]

通过Swift中的开头字符将数组拆分为多维数组？

1 个答案: