文本太大时，文本不显示在UILabel上。 [英] Text not displaying on UILabel when the text is too large.

问题描述

我有一个文本（一本书的故事）。我正在带UILabel来展示它。但它没有让我看到。我使用以下代码：

  CGSize labelsize; 
 UILabel * commentsTextLabel = [[UILabel alloc] init] ;; 
 [commentsTextLabel setNumberOfLines：0]; 
 commentsTextLabel.textColor = [UIColor blackColor]; 
 [commentsTextLabel setBackgroundColor：[UIColor clearColor]]; 
 [commentsTextLabel setFont：[UIFont fontWithName：@ACaslonPro-Regularsize：17]]; 
 labelsize = [story sizeWithFont：commentsTextLabel.font constrainedToSize：CGSizeMake（280,15000）lineBreakMode：NSLineBreakByWordWrapping]; 
 commentsTextLabel.frame = CGRectMake（20,200,280，labelsize.height）; 
 commentsTextLabel.text = story; //超过1000行
 
 [self.view addSubview：commentsTextLabel]; 
  

当我调试我的代码时，我发现labelize.height出现在我的情况下13145.Still it没有显示。
如果我减少15000到11000，那么文本最终会显示在....

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

<请帮帮我。
谢谢

解决方案

UILabel 将呈现其所有文字一旦进入后备缓冲区。 iOS设备只有有限的图形内存才能完成这项工作，因此一旦图形数据超过一定大小，它就会失败。

对于大量文本你应该使用核心文本或类似 UITextView 之类的东西，它可以更有效地按需呈现文本。

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

解决方案

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.

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