Limit the number of lines in UITextView

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text 

{

    

    // limit the number of lines in textview

    NSString* newText = [mytextView.text stringByReplacingCharactersInRange:range withString:text];

    // pretend there's more vertical space to get that extra line to check on

    CGSize tallerSize = CGSizeMake(mytextView.frame.size.width-15, mytextView.frame.size.height*2); 

    CGSize newSize = [newText sizeWithFont:mytextView.font constrainedToSize:tallerSize lineBreakMode:UILineBreakModeWordWrap];

    

    if (newSize.height > mytextView.frame.size.height)

    {

        NSLog(@"two lines are full");

        return NO;

    }

    

    

    // dismiss keyboard and send comment

    if([text isEqualToString:@"\n"]) {

        [mytextView resignFirstResponder];

        

        return NO;

    }

    

    return YES;

}