1.單行文本高度計算

define VPTEXTSIZE(text, font) [text length] > 0 ? [text \

sizeWithAttributes:@{NSFontAttributeName:font}] : CGSizeZero

2.默認不設(shè)置行間距時，單行多行都可以

• (CGSize)heightWithFont:(UIFont *)font
  MaxWidth:(float)width{
  if (self.length==0) {
  return CGSizeMake(0, 0);
  }
  CGRect rect = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
  options:NSStringDrawingTruncatesLastVisibleLine |
  NSStringDrawingUsesLineFragmentOrigin|
  NSStringDrawingUsesFontLeading
  attributes:@{NSFontAttributeName:font}
  context:nil];

  return CGSizeMake((rect.size.width), (rect.size.height));

}
2.設(shè)置行間距的情況
多行的情況
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = 12;
NSDictionary *dic = @{NSParagraphStyleAttributeName:paragraphStyle,NSFontAttributeName:[UIFont systemFontOfSize:14]};
NSMutableAttributedString *attrString = [[NSMutableAttributedString alloc] initWithString:text attributes:dic];
text4.attributedText = attrString;

• (CGFloat)heightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute fixedWidth:(CGFloat)width {

  NSParameterAssert(attribute);

  CGFloat height = 0;

  if (self.length) {

    CGRect rect = [self boundingRectWithSize:CGSizeMake(width, MAXFLOAT)
                                     options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin |
                   NSStringDrawingUsesFontLeading
                                  attributes:attribute
                                     context:nil];
    
    height = rect.size.height;
  

  }

  return height;
  }
  當(dāng)文本為單行時候又設(shè)置了行間距(純英文的情況沒有問題)牍帚，但是包含有中文的時候計算的高度就會有問題

height=[text heightWithStringAttribute:dic1 fixedWidth:[UIScreen mainScreen].bounds.size.width-20*2];
if ((height - [UIFont systemFontOfSize:14].lineHeight) <= paragraphStyle.lineSpacing) {//是否是單行
if ([self containChinese:text]) { //如果包含中文
height = height-paragraphStyle.lineSpacing;
// height = [NSString aLineOfTextHeightWithStringAttribute:dic1];

    }
    tex5.text=text;  //單行的情況就不能設(shè)置為attributedText了
}else{
    tex5.attributedText = attrString;

}

• (CGFloat)aLineOfTextHeightWithStringAttribute:(NSDictionary <NSString *, id> *)attribute {

  CGFloat height = 0;
  CGRect rect = [@"One" boundingRectWithSize:CGSizeMake(200, MAXFLOAT)
  options:NSStringDrawingTruncatesLastVisibleLine |NSStringDrawingUsesLineFragmentOrigin |
  NSStringDrawingUsesFontLeading
  attributes:attribute
  context:nil];

  height = rect.size.height;
  return height;
  }