如何从Swift 4中的描述中解析数组? [英] How to parse array from description in Swift 4?

问题描述

我正在学习Swift 4，我有一个算法可以输出数组的基数为64的描述，如下所示:

I'm learning Swift 4, and I have an algorithm that output the base 64 description of an array, like that:

extension String {

    func fromBase64() -> String? {
        guard let data = Data(base64Encoded: self) else {
            return nil
        }

        return String(data: data, encoding: .utf8)
    }

    func toBase64() -> String {
        return Data(self.utf8).base64EncodedString()
    }
}
let output = [1, 2, 4, 65].description.toBase64()
print(output.fromBase64()) // "[1, 2, 4, 65]"

现在，我的问题是我需要将数组放回到Array中，而不是在String中. 我已经上网查询了，但是找不到这种类型的数组的解析方法(他们都在谈论JSON).

Now, my problem is that I need the array back in an Array, and not as a String. I've looked up on the internet but I couldn't find a parsing method for this type of array (they were all talking about JSON).

推荐答案

以下是将字符串转换为Int数组的方法:

Here is the way you can convert your string into Int array:

var toString = output.fromBase64() //"[1, 2, 4, 65]"
if let str = toString {
    let chars = CharacterSet(charactersIn: ",][ ")
    let split = str.components(separatedBy: chars).filter { $0 != "" }.flatMap { Int($0)}
    print(split)  //[1, 2, 4, 65]
}

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