Writing a String to an NSOutputStream in Swift

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In recent Swift it should be even easier and NSData is no longer needed.

let s = "String to encode"
let encodedDataArray = [UInt8](s.utf8)
outputstream.write(encodedDataArray, maxLength: encodedDataArray.count)

Arrays can be accessed as buffers of the correct their type (see withUnsafeBufferPointer). I think the array is necessary because the utf8 view is not actually instantiated as a full array but just a view into the original string.

In production code you should check the return value of the write to the output stream and depending on your scenario check there is space before the write but the focus of this answer is the encoding of the Swift String so that it can be written.

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