Swift Dictionary：将键和值连接到字符串中

我正在寻找一个最好的语法：

let responseParameters = ["keyA" : "valueA","keyB" : "valueB"]
        var responseString = ""
        for (key,value) in responseParameters {
            responseString += "\(key):\(value)"
            if Array(responseParameters.keys).last != key {
                responseString += "+"
            }
        }
        //responseString: keyA:valueA+keyB:valueB

类似于数组joinWithSeparator,使用flatMap或类似的东西. (学习目的)

解决方法

您可以映射字典中的键/值对以将它们转换为字符串数组,然后您可以将它们与.但请记住,字典是无序的,因此这不会保留输入顺序.

let responseParameters = ["keyA" : "valueA","keyB" : "valueB"]

let responseString = responseParameters.map{ "\($0):\($1)" }
                                       .joinWithSeparator("+")