Swift Dictionary: join key and value into string
You can map over key/value pairs in dictionaries to convert them to an Array of Strings, then you can join those with +. But remember, dictionaries are unordered, so this will not preserve the input ordering.
let responseParameters = ["keyA" : "valueA", "keyB" : "valueB"]let responseString = responseParameters.map{ "\($0):\($1)" } .joinWithSeparator("+")
A dictionary is not an ordered collection, so you'll have to sort the keys prior to accessing the "ordered version" of the key-value pairs. E.g.
let responseParameters = ["keyA" : "valueA", "keyB" : "valueB", "keyC" : "valueC"]let responseString = responseParameters .sort { $0.0 < $1.0 } .map { $0 + ":" + $1 } .joinWithSeparator("+")print(responseString) // keyA:valueA+keyB:valueB+keyC:valueC
Updated answer for swift 5 :
let responseParameters = ["keyA": "valueA", "keyB": "valueB"]let responseString = responseParameters.map { "\($0):\($1)" } .joined(separator: "+")