//段落
    //line break
CTParagraphStyleSetting lineBreakMode;
CTLineBreakMode lineBreak = kCTLineBreakByCharWrapping; //换行模式
lineBreakMode.spec = kCTParagraphStyleSpecifierLineBreakMode;
lineBreakMode.value = &lineBreak;
lineBreakMode.valueSize = sizeof(CTLineBreakMode);
 
    //行间距
CTParagraphStyleSetting LineSpacing;
CGFloat spacing = 4.0;  //指定间距
LineSpacing.spec = kCTParagraphStyleSpecifierLineSpacingAdjustment;
LineSpacing.value = &spacing;
LineSpacing.valueSize = sizeof(CGFloat);
 
CTParagraphStyleSetting settings[] = {lineBreakMode,LineSpacing};
CTParagraphStyleRef paragraphStyle = CTParagraphStyleCreate(settings, 2);   //第二个参数为settings的长度
[attributedString addAttribute:(NSString *)kCTParagraphStyleAttributeName
                         value:(id)paragraphStyle
                         range:NSMakeRange(0, attributedString.length)];

+ (id)stringWithDefaultStyle:(NSString *)string kern:(CGFloat)kernValue
{
    NSNumber *kern = [NSNumber numberWithFloat:kernValue];
    NSNumber *und[......]<p class="read-more"><a href="https://www.yusian.com/blog/project/2014/08/09/232821615.html">继续阅读</a></p>

// 清除按钮左移一个单元
- (CGRect)clearButtonRectForBounds:(CGRect)bounds
{
    CGRect rect = [super clearButtonRectForBounds:bounds];
    if (_isReservedRightV[......]<p class="read-more"><a href="https://www.yusian.com/blog/project/2014/08/09/232329612.html">继续阅读</a></p>