ios - contentOffset Changes when Setting UITextView Frame in textViewDidChange -

i trying set height of uitextview dynamically in textviewdidchange. frame adjust proper height, when height greater threshold have set, textview should scroll new line. however, contentoffset gets messed , doesn't scroll down include new line.

- (void)viewdidload {     [super viewdidload];     _textview.frame = cgrectmake(60, 100, 200, _textview.contentsize.height);     _textview.scrollenabled = no; }  - (void)textviewdidchange:(uitextview *)textview {     nslog(@"offset: %f", _textview.contentoffset.y);      cgfloat height = _textview.contentsize.height;     _textview.scrollenabled = no;      if (_textview.contentsize.height >= 120) {         height = 120;         _textview.scrollenabled = yes;         _textview.contentoffset = cgpointmake(0, _textview.contentsize.height - _textview.frame.size.height);     }      cgrect frame = _textview.frame;     frame.size.height = height;     _textview.frame = frame; } 

i suppose easier way of explaining happening this. on blank view controller add uitextview in storyboard. add these 3 lines textviewdidchange:

cgrect frame = _textview.frame; frame.size.height = _textview.contentsize.height; _textview.frame = frame; 

every other time textview's height increases, text not vertically centered. if scroll around though , let go return correct position. frame correct size. contentoffset not quite right.

i wonder if post code you're doing?

i've tried on 5.0 , works.

-(void) textviewdidchange:(uitextview *)textview { int maxheight = 30; cgfloat height = [textview.text sizewithfont:textview.font constrainedtosize:cgsizemake(textview.frame.size.width, 99999) linebreakmode:nslinebreakbywordwrapping].height;  cgrect rect = textview.frame; rect.size.height = min(height, maxheight); [textview setframe:rect]; 

}