Swift：獲取字符串中的所有鍵值對

Question

我有一個String，它有許多由&符號附加的鍵值對。即：params = key1=Hello&key2=Hello World&key3=Hi Hello

有沒有辦法通過傳遞字符串中存在的鍵來提取值？例如，我想提取key1，key2，key3的值。

Answer 1

您可以使用URLComponents和URLQueryItem反正通過創建一個虛擬的URL

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) 
} 

也看到Best way to parse URL string to get values for keys?

Answer 2

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] 
} 

而在dictionary中，您將得到您的鍵值對。

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")]