问题描述
是否有一个 API 可以转换布尔值的大多数可能的字符串表示形式(例如True"、true"、False"、false"、yes"、no"、1"、0")在 Swift 中变成 Bool?
Is there an API to convert most possible String representations of Boolean values (e.g. "True", "true", "False", "false", "yes", "no", "1", "0") into a Bool in Swift?
如果不是，那么从头开始编码最类似于 Swift 的方法是什么?它会是一个功能性的 map() 操作吗?还是别的什么?
If not, what would be the most Swift-like approach to coding this from scratch? Would it be a functional map() operation? Or something else?
此实例中的原始源数据是 JSON，但我对以最类似于 Swift 的方式解决问题的关键点感兴趣，从而在此过程中更多地了解该语言.
The original source data in this instance is JSON, but I'm interested in the crux of solving the problem in the most Swift-like way possible and hence learning more about the language in the process.
推荐答案
AFAIK 没有内置方式.与标准 toInt() 类似的方法可能是:
There is not built in way AFAIK. Similar method to standard toInt() could be:
extension String {
var bool: Bool? {
switch self.lowercased() {
case "true", "t", "yes", "y":
return true
case "false", "f", "no", "n", "":
return false
default:
if let int = Int(string) {
return int != 0
}
return nil
}
}
}
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