If you want to add newline in Xcode5 / Xcode6 storyboard Attribute-Inspector (AI), you do it this way:
- Drag out a UITextView.
- Double-click it to edit text, place cursor where you want the paragraph break.
- Hit alt-Enter a couple of times to create a blank line & paragraph.
Or, CTRL + Return make a new line.
You can now see the effect into output / View-mode in storyboard.