Question

我有String，其中有许多键值对，附加了&符号。即：params = key1=Hello&key2=Hello World&key3=Hi Hello

有没有办法通过传递字符串中的键来提取值？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 = s.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

无论如何，您可以通过创建虚拟网址

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)
}

另见Best way to parse URL string to get values for keys?

Answer 3

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

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

Swift：从字符串

3 个答案: