swift 數組與字符串互相轉化

字符串轉數組

let str = "1,2,3"
let strArray = str.componentsSeparatedByString(",")

數組轉字符串

let array = ["1","2","3"]
let arrayStr = ",".join(array)
println(arrayStr) //"1,2,3"

//如果只是想打印出來可以這麼用
println(array.description) //"[1, 2, 3]"