Resizing UITextView

Question

I have a UITextView added on my UIView. The textview added is not editable, it is just to display some data. The data displayed in the textview is

Answer 1

After you add the UITextView to its parent if you set a Content Mode on it then it seems to resize itself automatically.

This means you don't need to work out the height manually and apply a height contraint. It just seems to work!! Tested in iOS7 and iOS8 on iPad.

e.g.

--
textView.contentMode = UIViewContentMode.Center;
--

If anyone can explain why this works it would be much appreciated.. I found it by accident when messing with options in interface builder.