How to vertically center two UILabel with dynamic heights

Question

How to center vertically two UILabel (dynamic heights) inside a view, like this with Label1 (2 lines, truncated) and Label2 (1 line, truncated):

+------------------------------------------+
|                                          |
|                                          |
|Label1 Label1 Label1 Label1 Label1 Label1 |
|Label1 Label1 Label1 Label1 Label1 ...    |
|Label2 Label2 Label2 Label2 Label2 ...    |
|                                          |
|                                          |
+------------------------------------------|

I guess this is not possible with a single UILabel and a NSAttributedString (to truncate one part on 2 lines, and another part on 1 line).

Answer 1

If you are using auto layout, you can embed the two labels in a parent UIView, and then use a constraint to vertically center the parent UIView in its superview.

Answer 2

You can get labels frame in view did appear and replace them on the screen again. I tried that before and it worked. may you also need to call setNeedsDisplay.

- (void)viewDidAppear:(BOOL)animated {

   float heights = lbl1.frame.size.height + lbl2.frame.size.height;
   lbl1.frame = CGRectMake( lbl1.frame.origin.x, screenheight/2 - heights/2, lbl1.frame.size.width, lbl1.frame.size.height );
   lbl2.frame = CGRectMake( lbl2.frame.origin.x, screenheight/2 - heights/2 + lbl1.frame.size.height, lbl2.frame.size.width, lbl2.frame.size.height );
  [lbl1 setNeedsDisplay];
  [lbl2 setNeedsDisplay];
}