UILabel的富文本属性和计算高度

注：新添加一个富文本方法，在文字只有一行的时候，取消行间距！

把下面两个方法随便放到一个公共的文件里，在.h声明这两个方法的方法名，在.m中粘如下面两个方法,需要的时候只需要导入头文件,就可以设置富文本属性,和计算富文本的高度

/**

• 富文本
• @param string 文本
• @param font 字体
• @param lineSpacing 行高
• @param lineHeightMultiple 行间距（1.5倍）
• @param lineBreakMode 段落样式
• @return
  */
  + (NSMutableAttributedString *)getAttributedString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{
  NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = lineSpacing;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle,NSForegroundColorAttributeName:[UIColor blackColor]};
  [attributedString addAttributes:cyZoneDocAttribute range:NSMakeRange(0, [string length])];
  return attributedString;
  }

/**

• 计算文本高度

• @param text 文本

• @param limitW 文本宽度

• @param font 字体

• @param lineSpacing 行高

• @param lineHeightMultiple 行间距

• @param lineBreakMode 段落样式

• @return
  */
  + (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = lineSpacing;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  
  NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle};
  
  CGSize size;
  size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size;
  return size;
  }
  

注：对之前的方法进行修改，因为设置富文本的属性的时候可能出现只有一行文字，还出现行间距，这样会让我们的约束特别的困难，新增加一个方法，在设置富文本属性的时候多传入一个宽度，确保在只有一行文字的时候，不会有行间距，方法如下：

/**

• 富文本

• @param string 文本

• @param font 字体

• @param lineSpacing 行高

• @param lineHeightMultiple 行间距（1.5倍）

• @param lineBreakMode 段落样式

• @param limitWith 文本宽度

• @return
  */
  + (NSMutableAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode limitWith:(CGFloat)limitWith{
  if (string == nil) {
  return nil;
  }
  NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  CGSize selfSize = [self calculateSizeWithText:string limitWidth:limitWith font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode];
  CGSize oneLineSize = [self calculateSizeWithText:@"哈哈" limitWidth:MAXFLOAT font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode];

  paragraphStyle.lineSpacing = selfSize.height > oneLineSize.height ? lineSpacing : 0;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  
  return attributedString;
  }
  

注：增加一个单行不设置行间距的计算行高方法

/**

• 计算文本高度

• @param text 文本

• @param limitW 文本宽度

• @param font 字体

• @param lineSpacing 行高

• @param lineHeightMultiple 行间距

• @param lineBreakMode 段落样式

• @return
  */
  + (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode{

  CGSize selfSize = [self calculateSizeWithText:text limitWidth:limitW font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode paragraphSpacing:0];
  CGSize oneLineSize = [self calculateSizeWithText:@"哈哈" limitWidth:MAXFLOAT font:font lineSpacing:0 lineHeightMultiple:lineHeightMultiple lineBreakMode:lineBreakMode paragraphSpacing:0];
  
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = selfSize.height > oneLineSize.height ? lineSpacing : 0;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  
  NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle};
  
  CGSize size;
  size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size;
  return size;
  }
  

注：这里增加一个设置富文本属性的时候增加段间距参数

/**

• 富文本

• @param string 文本

• @param font 字体

• @param lineSpacing 行高

• @param lineHeightMultiple 行间距（1.5倍）

• @param lineBreakMode 段落样式

• @param paragraphSpacing 段间距（1.5倍）

• @return
  */
  + (NSMutableAttributedString *)getAttributedStringWithString:(NSString *)string font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode paragraphSpacing:(CGFloat)paragraphSpacing{
  if (string == nil) {
  return nil;
  }
  NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:string];
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = lineSpacing;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  paragraphStyle.paragraphSpacing = paragraphSpacing;

  NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle};
  
  [attributedString addAttributes:cyZoneDocAttribute range:NSMakeRange(0, [string length])];
  return attributedString;
  }
  

注：这里添加增加一个有段间距的方法计算行高

/**

• 计算文本高度

• @param text 文本

• @param limitW 文本宽度

• @param font 字体

• @param lineSpacing 行高

• @param lineHeightMultiple 行间距

• @param lineBreakMode 段落样式

• @param paragraphSpacing 段间距（1.5倍）

• @return
  */
  + (CGSize)calculateSizeWithText:(NSString *)text limitWidth:(CGFloat)limitW font:(UIFont *)font lineSpacing:(CGFloat)lineSpacing lineHeightMultiple:(CGFloat)lineHeightMultiple lineBreakMode:(NSLineBreakMode )lineBreakMode paragraphSpacing:(CGFloat)paragraphSpacing{

    NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = lineSpacing;
  paragraphStyle.lineHeightMultiple = lineHeightMultiple;
  paragraphStyle.lineBreakMode = lineBreakMode;
  paragraphStyle.paragraphSpacing = paragraphSpacing;
  
  NSDictionary *cyZoneDocAttribute = @{NSFontAttributeName:font,NSParagraphStyleAttributeName: paragraphStyle};
  
  CGSize size;
  size = [text boundingRectWithSize:CGSizeMake(limitW, MAXFLOAT) options: NSStringDrawingTruncatesLastVisibleLine | NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading attributes:cyZoneDocAttribute context:nil].size;
  
  return size;
  }