How to convert UInt8 byte array to string in Swift

I am facing problems while converting UInt8 Byte array to string in swift. I have searched and find a simple solution

String.stringWithBytes(buff, encoding: NSUTF8StringEncoding)

but it is showing error String.type does not have a member stringWithBytes. Can anyone suggest me a solution ?

this is my code where i am getting anNSData and converted into bytes array and then i have to convert that byte array into string.

let count = data.length / sizeof(UInt8)
var array = [UInt8](count: count, repeatedValue: 0)
data.getBytes(&array, length:count * sizeof(UInt8))
String.stringWithBytes(buff, encoding: NSUTF8StringEncoding)

Update for Swift 3/Xcode 8:

String from bytes: [UInt8]:

if let string = String(bytes: bytes, encoding: .utf8) {
    print(string)
} else {
    print("not a valid UTF-8 sequence")
}

String from data: Data:

let data: Data = ...
if let string = String(data: data, encoding: .utf8) {
    print(string)
} else {
    print("not a valid UTF-8 sequence")
}

---

Update for Swift 2/Xcode 7:

String from bytes: [UInt8]:

if let string = String(bytes: bytes, encoding: NSUTF8StringEncoding) {
    print(string)
} else {
    print("not a valid UTF-8 sequence")
}

String from data: NSData:

let data: NSData = ...
if let str = String(data: data, encoding: NSUTF8StringEncoding) {
    print(str)
} else {
    print("not a valid UTF-8 sequence")
}

---

Previous answer:

String does not have a stringWithBytes() method. NSString has a

 NSString(bytes: , length: , encoding: )

method which you could use, but you can create the string directly from NSData, without the need for an UInt8 array:

if let str = NSString(data: data, encoding: NSUTF8StringEncoding) as? String {
    println(str)
} else {
    println("not a valid UTF-8 sequence")
}