pragma mark++++根据文字的大小计算size++++

• (CGSize)sizeWithText:(NSString *)text font:(UIFont *)font maxSize:(CGSize)maxSize
  {
  NSDictionary *attrs = @{NSFontAttributeName : font};// NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingTruncatesLastVisibleLine
  return [text boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin |NSStringDrawingTruncatesLastVisibleLine attributes:attrs context:nil].size;
  }

pragma mark++++ 带换行符垂直布局 根据文字的大小计算size++++

• (CGSize)sizeWithText2:(NSString *)text font:(UIFont *)font maxSize:(CGSize)maxSize
  {
  CGSize size ;

  CGFloat h =0;
  NSArraystrArr=[text componentsSeparatedByString:@"\n"];
  for (NSStringstr in strArr)
  {
  CGSize size1 = [self sizeWithText:str font:font maxSize:maxSize];
  h= h+size1.height;
  }
  size = CGSizeMake(maxSize.width, h);
  return size;
  }