lable在单元格上得自适应

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cell.content.numberOfLines = 3;

    CGSize size = [str boundingRectWithSize:CGSizeMake([UIScreen mainScreen bounds].size.width-20, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:NSDictionary dictionaryWithObject:cell.content.font forKey:NSFontAttributeName context:nil].size;

    CGRect frame = cell.content.frame;

    frame.size = size;

    cell.content.frame = frame;

content是cell上的一个lable.