swift 数组与字符串互相转化

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字符串转数组

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

数组转字符串

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

//如果只是想打印出来可以这么用
println(array.description) //"[1, 2, 3]"