YYText实现文本与下划线，删除线偏移_yytext 下划线

设置下划线，删除线

主要原理就是通过设置yy_baselineOffset和yy_textUnderline = [YYTextDecoration decorationWithStyle:YYTextLineStyleSingle];
形成字体偏移，但是下划线保持原位置，来确保下划线与文本之间的偏移量，
**注意！**如果直接设置yy_underlineStyle = NSUnderlineStyleSingle的话，下划线会与文本同时偏移。

最终效果

代码（以下划线为例，删除线同理）

// 创建一个NSAttributedString
UIFont *font = [UIFont systemFontOfSize:14];
    NSMutableAttributedString *Text = [[NSMutableAttributedString alloc] init];
    YYLabel *label = [[YYLabel alloc] initWithFrame:CGRectMake(0, 100, 1000, 100)];
    label.numberOfLines = 5;
    label.font = font;
    NSMutableAttributedString *attr1 = [[NSMutableAttributedString alloc] initWithString:@"粗斜体下滑线偏移"];
    attr1.yy_textUnderline = [YYTextDecoration decorationWithStyle:YYTextLineStyleSingle];
    attr1.yy_font = [UIFont fontWithDescriptor:[[font fontDescriptor] fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold] size:font.pointSize];
    attr1.yy_maximumLineHeight = 22;
    attr1.yy_minimumLineHeight = 22;
    CGFloat baselineOffset = (22 - attr1.yy_font.lineHeight) / 4;
    attr1.yy_baselineOffset = @(-baselineOffset);
    attr1.yy_textGlyphTransform = CGAffineTransformMake(1, 0, tanf(10 * (CGFloat)M_PI / 180), 1, 0, 0);
    NSMutableAttributedString *attr2 = [[NSMutableAttributedString alloc] initWithString:@"普通文本+下划线偏移"];
    attr2.yy_font = font;
    attr2.yy_maximumLineHeight = 22;
    attr2.yy_minimumLineHeight = 22;
    baselineOffset = (22 - attr2.yy_font.lineHeight) / 4;
    attr2.yy_baselineOffset = @(baselineOffset);
    attr2.yy_textUnderline = [YYTextDecoration decorationWithStyle:YYTextLineStyleSingle];
    NSMutableAttributedString *attr3 = [[NSMutableAttributedString alloc] initWithString:@"普通文本偏 +下划线不偏"];
    attr3.yy_font = font;
    attr3.yy_maximumLineHeight = 22;
    attr3.yy_minimumLineHeight = 22;
    attr3.yy_underlineStyle = NSUnderlineStyleSingle;
    attr3.yy_baselineOffset = @(baselineOffset);
    baselineOffset = (22 - attr3.yy_font.lineHeight) / 4;
    NSMutableAttributedString *attr4 = [[NSMutableAttributedString alloc] initWithString:@"普通文本不偏 下划线不偏\n"];
    attr4.yy_font = font;
    attr4.yy_maximumLineHeight = 22;
    attr4.yy_minimumLineHeight = 22;
    attr3.yy_underlineStyle = NSUnderlineStyleSingle;
    [Text appendAttributedString:attr1];
    [Text yy_appendString:@" "];
    [Text appendAttributedString:attr2];
    [Text yy_appendString:@" "];
    [Text appendAttributedString:attr3];
    [Text yy_appendString:@" "];
    [Text appendAttributedString:attr4];
    label.attributedText = Text;
    [label sizeToFit];
    [self.view addSubview:label];
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