UITextView, setContentOffset and missing bottom part

Question

For some strange reason, my UITextView's text appears cropped when the scrollofset is set.

Here's what it looks like:

This happens after doing:

        textview.contentInset = UIEdgeInsetsZero;
        [textview setContentOffset:CGPointMake(0, startypos + offset_yshift) animated:NO];

I tried manually setting contentSize.height, but that introduced another strange behavior, where the content offset seems to be ignored..

''Edit'': This is the code used to instantiate the textfield:

  CGRect myImageRect = CGRectMake(-50.0f, -50.0f, 40.0f, 40.0f);
  textview = [[UITextView alloc] initWithFrame: myImageRect];
  textview.autocapitalizationType = UITextAutocapitalizationTypeNone;
  [textview setScrollEnabled:YES];
  textview.hidden = YES;
  textview.contentInset = UIEdgeInsetsZero;
  textview.opaque = NO;
  textview.backgroundColor = [UIColor clearColor];
  textview.textColor = [UIColor colorWithWhite:1 alpha:1];
  textview.textAlignment = NSTextAlignmentCenter;
  textview.frame = CGRectMake(0, 0, 250, 30);
  textview.scrollEnabled = NO;

And the "update" code that checks the content positioning every frame:

  // setting the actual size here
  UITextPosition * pos = [textview positionFromPosition: textview.endOfDocument offset:nil];
  CGRect therect = [textview caretRectForPosition:pos];

  CGRect frame = textview.frame;

  if([textview.text length] == 0){
     frame.size.height = 30;
  } else {
     frame.size.height = therect.origin.y + therect.size.height;
  }

  // and here, we're changing the frame variable's height to max to 50
  if(frame.size.height > 50){
     frame.size.height = 50;
  }
  frame.size.width = desiredwidth; // some other variable

  textview.frame = frame;

  /*

     ... snip, unrelated code ...

  */

  // later on

        textview.contentInset = UIEdgeInsetsZero;
        [textview setContentOffset:CGPointMake(0, startypos + offset_yshift) animated:NO];

As you can imagine, the setContentOffset bit there is what's causing the issue.

What is going on?

Answer 1

please try this from prev post

CGPoint offset = CGPointMake(0, self.textView.contentSize.height - self.textView.frame.size.height);
[self.textView setContentOffset: CGPointMake(0,0) animated:NO]; 
or
[self.textView setContentOffset:bottomOffset animated:YES];

[post]: UITextView contentOffset on iOS 7 "prev post"\