String 를 NSData 로, NSData 를 String 로

swift에서 String를 NSData로, NSData를 String로 바꾸는 코드입니다.

var swift_string = "lorem ipsum dolor sit amet"
// from String to NSData
let data = swift_string.dataUsingEncoding(NSUTF8StringEncoding)
// from NSData to String
var out: String = String(data:data!, encoding:NSUTF8StringEncoding)!
print(out) // print "lorem ipsum dolor sit amet"

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