反向Swift字典查询 [英] Reverse Swift dictionary lookup

问题描述

我有一本这样的字典:

let ints: [Int: String] = [
    0: "0",
    1: "1",
    2: "2",
    3: "3",
    4: "4",
    5: "5",
    6: "6",
    7: "7",
    8: "8",
    9: "9",
    10: "A",
    11: "B",
    // etc...
]

我可以用ints[5]查找整数以获得"5".如何从字符串中查找整数?我想做类似ints.keys["5"]-> 5的事情.

I can look up an integer with ints[5] to get "5". How can I look up the integer from the string? I want to do something like ints.keys["5"] -> 5.

此刻，我刚刚向后写了字典:

At the moment, I have just written the dictionary backwards:

let chars: [String: Int] = [
    "0": 0,
    "1": 1,
    "2": 2,
    "3": 3,
    "4": 4,
    "5": 5,
    "6": 6,
    "7": 7,
    "8": 8,
    "9": 9,
    "A": 10,
    "B": 11,
    // etc...
]

我可以做chars["5"]来获得5，但这是一个麻烦的解决方案，因为我的字典很大，并且希望能够在需要时轻松地对其进行更改.

I can do chars["5"] to get 5, but this is a cumbersome solution since my dictionary is big and want to be able to change it easily if needed.

我不想以编程方式构造字典，而只保留一个硬编码.

I don't want to programmatically construct the dictionaries, but just keep one hard coded.

推荐答案

我使用Martin R的链接来找到此解决方案:

I used Martin R's link to find this solution:

let int = 11
print(chars.filter{$1 == int}.map{$0.0}[0]) // B

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