iphone - Text not displaying on UILabel when the text is too large.

Question

I have a text (Story of a book). I am taking UILabel to display it. But it is not showing me on view. I am using the following code:

    CGSize labelsize;
    UILabel *commentsTextLabel = [[UILabel alloc] init];;
    [commentsTextLabel setNumberOfLines:0];
    commentsTextLabel.textColor = [UIColor blackColor];
    [commentsTextLabel setBackgroundColor:[UIColor clearColor]];
    [commentsTextLabel setFont:[UIFont fontWithName:@"ACaslonPro-Regular"size:17]];
    labelsize=[story sizeWithFont:commentsTextLabel.font constrainedToSize:CGSizeMake(280, 15000) lineBreakMode:NSLineBreakByWordWrapping];
    commentsTextLabel.frame=CGRectMake(20, 200, 280, labelsize.height);
   commentsTextLabel.text = story;// more than 1000 lines

   [self.view addSubview:commentsTextLabel];

When i debug my code, i found labelsize.height is coming out in my case 13145.Still it is not showing. If i descrease 15000 to 11000 , then text is showing on view with .... at last.

labelsize=[story sizeWithFont:commentsTextLabel.font constrainedToSize:CGSizeMake(280, 15000) lineBreakMode:NSLineBreakByWordWrapping];

Please help me out. Thanks

Answer 1

UILabel will render all its text at once into a backing buffer. iOS devices only have a limited amount of graphics memory to do this work, so it will fail once the graphics data goes above a certain size.

For large amounts of text you should use Core Text or something like UITextView which renders its text on-demand much more efficiently.