Accessing JSON values with unknown keys using recursion

jsonWithoutKeys.swift

func printJSON(json: [String:Any]) {
    let jsonKeys = json.keys //Gets the list of keys on the outer-most layer of the JSON
    for i in 0..<jsonKeys.count {
        let level1 = json[jsonKeys.index(jsonKeys.startIndex, offsetBy: i)] //retrieves the object with the specific keys
        if let level2 = json[level1.key] as? [String:Any]{ //if the key is another object
            printJSON(json: level2) //send it as a new json object to the function again
        } else if let level2 = json[level1.key] as? [[String:Any]] { //if the key is an array of objects
            for i in 0..<level2.count { //loop through the array
                printJSON(json: level2[i]) //send each array element to the function
            }
        } else if let value = json[level1.key] as? String { //if value of String/Integer/Bool type
            print(value) //then only print values of the specified type (String-type in this case)
        }
    }
}

//usage: printJSON(json: json) //json is the json object deserialized from.