auto scroll for UITextView using swift (IOS app)

You could also set contentOffset:

let point = CGPoint(x: 0.0, y: (textView.contentSize.height - textView.bounds.height))
textView.setContentOffset(point, animated: true)

It will scroll to the bottom.

Swift 5 update for @SwiftArchitect answer:

let range = NSRange(location: textView.text.count - 1, length: 0)
textView.scrollRangeToVisible(range)

This will scroll to the bottom of a UITextView, with an animation:

let range = NSMakeRange(textView.text.characters.count - 1, 0)
textView.scrollRangeToVisible(range)

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