Swift：从字符串中获取所有键值对

Question

我有一个

String

，其中有许多键值对，并附加了

&

符号。即：

params = key1=Hello&key2=Hello World&key3=Hi Hello

有没有办法仅通过传递字符串中存在的键来提取值？例如我想提取key1，key2，key3的值。

Answer 1

let string = "key1=Hello&key2=Hello World&key3=Hi Hello"

let components = string.components(separatedBy: "&")


var dictionary: [String : String] = [:]

for component in components{
  let pair = component.components(separatedBy: "=")
  dictionary[pair[0]] = pair[1]
}

在

dictionary

中，您将获得键值对。

Answer 2

您可以通过创建虚拟 URL 来使用

URLComponents

和

URLQueryItem

let params = "key1=Hello&key2=Hello World&key3=Hi Hello"
if let components = URLComponents(string: "http://dummy.com/path?" + params.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlQueryAllowed)!),
    let queryItems = components.queryItems {
    let arrayOfValues = queryItems.flatMap{ $0.value }
    print(arrayOfValues)
}

另请参阅 解析 URL 字符串以获取键值的最佳方法？

Answer 3

let params = "key1=Hello&key2=Hello World&key3=Hi Hello"

let separated = params.components(separatedBy: CharacterSet(charactersIn: "&="))
let keys = separated.enumerated().filter{$0.0 % 2 == 0}
print (keys) // [(offset: 0, element: "key1"), (offset: 2, element: "key2"), (offset: 4, element: "key3")]