富文本中的段落属性

//   NSParagraphStyleAttributeName 段落的风格（设置首行，行间距，对齐方式什么的）看自己需要什么属性，写什么
  NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
  paragraphStyle.lineSpacing = 10;// 字体的行间距
  paragraphStyle.firstLineHeadIndent = 20.0f;//首行缩进
  paragraphStyle.alignment = NSTextAlignmentJustified;//（两端对齐的）文本对齐方式：（左，中，右，两端对齐，自然）
  paragraphStyle.lineBreakMode = NSLineBreakByTruncatingTail;//结尾部分的内容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")
  paragraphStyle.headIndent = 20;//整体缩进(首行除外)
  paragraphStyle.tailIndent = 20;//
  paragraphStyle.minimumLineHeight = 10;//最低行高
  paragraphStyle.maximumLineHeight = 20;//最大行高
  paragraphStyle.paragraphSpacing = 15;//段与段之间的间距
  paragraphStyle.paragraphSpacingBefore = 22.0f;//段首行空白空间/* Distance between the bottom of the previous paragraph (or the end of its paragraphSpacing, if any) and the top of this paragraph. */
  paragraphStyle.baseWritingDirection = NSWritingDirectionLeftToRight;//从左到右的书写方向（一共➡️三种）
  paragraphStyle.lineHeightMultiple = 15;/* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */
  paragraphStyle.hyphenationFactor = 1;//连字属性 在iOS，唯一支持的值分别为0和1







/*
   NSFontAttributeName 字体大小
   NSParagraphStyleAttributeName 段落的风格（设置首行，行间距，对齐方式什么的）
   NSKernAttributeName 字间距
   */
  NSDictionary *attributes = @{
                 NSFontAttributeName:[UIFont systemFontOfSize:15],
                 NSParagraphStyleAttributeName:paragraphStyle,
                 NSKernAttributeName:@(10),
                                
                 };
  textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];