1. typedef NS_ENUM(NSInteger, NSLineBreakMode) {/* What to do with long lines */  
2. 0,     /* Wrap at word boundaries, default */  
3. /* Wrap at character boundaries */  
4. /* Simply clip */剪掉后面显示不了的部分  
5. /* Truncate at head of line: "...wxyz" */头部分的内容以……方式省略  
6. /* Truncate at tail of line: "abcd..." */结尾部分的内容以……方式省略  
7. /* Truncate middle of line:  "ab...yz" */中间部分的内容以……方式省略  
8. } NS_ENUM_AVAILABLE_IOS(6_0);  
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14. typedef NS_ENUM(NSInteger, NSWritingDirection) {  
15. 1,    // Determines direction using the Unicode Bidi Algorithm rules P2 and P3  
16. 0,    // Left to right writing direction 左到右的书写方向  
17. 1    // Right to left writing direction 右到左的书写方向  
18. } NS_ENUM_AVAILABLE_IOS(6_0);  
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26. //   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  
27. NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];  
28. .lineSpacing = 10;// 字体的行间距  
29. .firstLineHeadIndent = 20.0f;//首行缩进  
30. .alignment = NSTextAlignmentJustified;//（两端对齐的）文本对齐方式：（左，中，右，两端对齐，自然）  
31. .lineBreakMode = NSLineBreakByTruncatingTail;//结尾部分的内容以……方式省略 ( "...wxyz" ,"abcd..." ,"ab...yz")  
32. .headIndent = 20;//整体缩进(首行除外)  
33. .tailIndent = 20;//  
34. .minimumLineHeight = 10;//最低行高  
35. .maximumLineHeight = 20;//最大行高  
36. .paragraphSpacing = 15;//段与段之间的间距  
37. .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. */  
38. .baseWritingDirection = NSWritingDirectionLeftToRight;//从左到右的书写方向（一共➡️三种）  
39. .lineHeightMultiple = 15;/* Natural line height is multiplied by this factor (if positive) before being constrained by minimum and maximum line height. */  
40. .hyphenationFactor = 1;//连字属性 在iOS，唯一支持的值分别为0和1  
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48. /*
49.      NSFontAttributeName 字体大小
50.      NSParagraphStyleAttributeName 段落的风格（设置首行，行间距，对齐方式什么的）
51.      NSKernAttributeName 字间距
52.      */  
53. NSDictionary *attributes = @{  
54.  NSFontAttributeName:[UIFont systemFontOfSize:15],  
55.  NSParagraphStyleAttributeName:paragraphStyle,  
56.  NSKernAttributeName:@(10),  
57.                                                                 
58.                                  };  
59. .attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];  
60.