\U0000202E,特殊字符趣事

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U0000202E
. Z  G! i9 e( r7 B9 E今天在项目中遇到一个很有意思的事情，测试在编辑用户昵称的时候，不知道从哪里copy了一个特殊字符U0000202E，然后我们在label上面显示的时候就出问题了，本来应该是wind参加了活动，结果变成了wind动活了加参，当时我就懵逼了，后面断点调试，发现字符串为windU0000202E参加了活动。后面我在Google上搜索U0000202E，只搜到了两条结果
/ K8 o# G1 K4 ?* t2 vhttp://permalink.gmane.org/gmane.comp.lib.regexp.tre/39 https://github.com/nbjahan/launchbar-unisym/blob/master/src/2000-206f_general_punctuation.go

然后我把第一条链接里面的所提及用demo运行效果出来了。

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1. (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
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2.     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
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3.     if (!cell) {
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4.         cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
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5.     }
   
6.     static NSArray *charArray = nil;
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7.     if (!charArray) {
   
8.         charArray = @[@"U0000200E", @"U0000200F", @"U0000200B", @"U0000202A", @"U0000202E", @"U00002060", @"U0000206A", @"U0000206F"];
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9.     }
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10.     if (indexPath.row < [charArray count]) {
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11.         NSString *text = [NSString stringWithFormat:@"%@+%@-%@", @(indexPath.row + 1), charArray[indexPath.row], @"一颗赛艇"];
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12.         NSString *length = @(text.length).stringValue;
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13.         NSInteger index = [text rangeOfString:charArray[indexPath.row]].location;
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14.         cell.textLabel.text = text;
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15.         cell.detailTextLabel.text = [NSString stringWithFormat:@"length:%@ index:%@", length, @(index)];
    
16.     }
    
17.     return cell;
    
18. }

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下面是第二个链接的东西，是一个数组，关于unicode码以及它的相关含义。
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1. func init() {
   
2. 
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3. chars["02000"] = [][2]string{
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4. 
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5. // {"En Quad", "U00002000"},
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6. 
   
7. // {"Em Quad", "U00002001"},
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8. 
   9 b! Z" F: f8 ]6 _4 E
9. // {"En Space", "U00002002"},
   
10. 
    2 I5 x0 C- m1 ]/ p
11. // {"Em Space", "U00002003"},
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12. 
    6 Y3 `8 {8 Y( p6 Z  _
13. // {"Three-Per-Em Space", "U00002004"},
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14. 
    : H5 [2 i  A7 @9 L7 I
15. // {"Four-Per-Em Space", "U00002005"},
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16. 
    
17. // {"Six-Per-Em Space", "U00002006"},
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18. 
      h+ x& t+ e; b. L2 S. y( `
19. // {"Figure Space", "U00002007"},
    
20. 
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21. // {"Punctuation Space", "U00002008"},
    
22. 
    
23. // {"Thin Space", "U00002009"},
    
24. 
    
25. // {"Hair Space", "U0000200a"},
    
26. 
    2 k; ?& C( S3 r# X8 y# _
27. // {"Zero Width Space", "U0000200b"},
    
28. 
    . z6 |! b7 W# p  t( L
29. // {"Zero Width Non-Joiner", "U0000200c"},
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30. 
    : V" i/ N7 n. F, k- N4 m
31. // {"Zero Width Joiner", "U0000200d"},
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32. 
    0 g8 v$ u  p" F
33. // {"Left-To-Right Mark", "U0000200e"},
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34. 
    
35. // {"Right-To-Left Mark", "U0000200f"},
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36. 
      `5 e2 E' t. t7 [& g, F5 \
37. {"Hyphen", "U00002010"},
    
38. 
    + U, L. C0 J& H! U) d
39. {"Non-Breaking Hyphen", "U00002011"},
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40. 
    # W4 F5 G1 ?+ y8 Y) I9 B
41. {"Figure Dash", "U00002012"},
    
42. 
    
43. {"En Dash", "U00002013"},
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44. 
    
45. {"Em Dash", "U00002014"},
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46. 
    
47. {"Horizontal Bar", "U00002015"},
    
48. 
    9 D$ Y. r- }% r" T" E; G8 q
49. {"Double Vertical Line", "U00002016"},
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50. 
    
51. {"Double Low Line", "U00002017"},
    
52. 
    ' e0 ?/ {5 ^: k
53. {"Left Single Quotation Mark", "U00002018"},
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54. 
    & {. R9 U' h0 t2 w" s; \
55. {"Right Single Quotation Mark", "U00002019"},
    
56. 
    
57. {"Single Low-9 Quotation Mark", "U0000201a"},
    
58. 
    $ k" K2 W8 B, v- I0 v$ d/ ^9 T
59. {"Single High-Reversed-9 Quotation Mark", "U0000201b"},
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60. 
    
61. {"Left Double Quotation Mark", "U0000201c"},
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62. 
    
63. {"Right Double Quotation Mark", "U0000201d"},
    
64. 
    
65. {"Double Low-9 Quotation Mark", "U0000201e"},
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66. 
    
67. {"Double High-Reversed-9 Quotation Mark", "U0000201f"},
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68. 
    % G. x5 r/ p% b- T. ?, c- I3 [+ s5 U
69. {"Dagger", "U00002020"},
    
70. 
    1 `1 L: A( F: d& V) R; @- }7 v  u
71. {"Double Dagger", "U00002021"},
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72. 
    
73. {"Bullet", "U00002022"},
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74. 
    
75. {"Triangular Bullet", "U00002023"},
    
76. 
    
77. {"One Dot Leader", "U00002024"},
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78. 
    
79. {"Two Dot Leader", "U00002025"},
    
80. 
    
81. {"Horizontal Ellipsis", "U00002026"},
    
82. 
    
83. {"Hyphenation Point", "U00002027"},
    
84. 
    3 N1 I8 [! V8 s- \8 m+ ]; b: C+ T! q
85. // {"Line Separator", "U00002028"},
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86. 
    % o7 |/ [' V3 C. _
87. // {"Paragraph Separator", "U00002029"},
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88. 
    
89. // {"Left-To-Right Embedding", "U0000202a"},
    
90. 
    
91. // {"Right-To-Left Embedding", "U0000202b"},
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92. 
    
93. // {"Pop Directional Formatting", "U0000202c"},
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94. 
    + @! r! Q. N; Z: I
95. // {"Left-To-Right Override", "U0000202d"},
    
96. 
    ) u$ _( T5 J% J, d
97. // {"Right-To-Left Override", "U0000202e"},
    
98. 
    
99. // {"Narrow No-Break Space", "U0000202f"},
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100. 
     & }8 y1 G: U, s9 w' Z
101. {"Per Mille Sign", "U00002030"},
     
102. 
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103. {"Per Ten Thousand Sign", "U00002031"},
     
104. 
     2 }. o' N2 A4 Y! Q
105. {"Prime", "U00002032"},
     
106. 
     / u2 }% x$ K4 h! m% s' i& e
107. {"Double Prime", "U00002033"},
     
108. 
     ( H1 h1 R! H6 p! d8 F% j
109. {"Triple Prime", "U00002034"},
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110. 
     
111. {"Reversed Prime", "U00002035"},
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112. 
     
113. {"Reversed Double Prime", "U00002036"},
     
114. 
     / G1 o) y- X% M. i+ M/ \3 D2 i' E; j
115. {"Reversed Triple Prime", "U00002037"},
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116. 
     , o4 _4 l4 V$ u( _
117. {"Caret", "U00002038"},
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118. 
     
119. {"Single Left-Pointing Angle Quotation Mark", "U00002039"},
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120. 
     
121. {"Single Right-Pointing Angle Quotation Mark", "U0000203a"},
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122. 
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123. {"Reference Mark", "U0000203b"},
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124. 
     8 u+ U. `* E& q" z/ M
125. {"Double Exclamation Mark", "U0000203c"},
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126. 
     $ z0 L! `% K; t" E6 t
127. {"Interrobang", "U0000203d"},
     
128. 
     ) b7 V) y9 d' s% g9 `
129. {"Overline", "U0000203e"},
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130. 
     4 E3 d: w" r9 r6 H! C% G: G
131. {"Undertie", "U0000203f"},
     
132. 
     % y! v. T: O. _: q: Z
133. {"Character Tie", "U00002040"},
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134. 
     2 q( a" |' _$ x/ r) C5 Q) x
135. {"Caret Insertion Point", "U00002041"},
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136. 
     8 }$ }3 z2 i  e, O
137. {"Asterism", "U00002042"},
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138. 
     
139. {"Hyphen Bullet", "U00002043"},
     
140. 
     
141. {"Fraction Slash", "U00002044"},
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142. 
     
143. {"Left Square Bracket With Quill", "U00002045"},
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144. 
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145. {"Right Square Bracket With Quill", "U00002046"},
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146. 
     
147. {"Double Question Mark", "U00002047"},
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148. 
     8 U! n% h5 d+ Y. v/ ]# s% }4 W
149. {"Question Exclamation Mark", "U00002048"},
     
150. 
     
151. {"Exclamation Question Mark", "U00002049"},
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152. 
     
153. {"Tironian Sign Et", "U0000204a"},
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154. 
     
155. {"Reversed Pilcrow Sign", "U0000204b"},
     
156. 
     
157. {"Black Leftwards Bullet", "U0000204c"},
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158. 
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159. {"Black Rightwards Bullet", "U0000204d"},
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160. 
     
161. {"Low Asterisk", "U0000204e"},
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162. 
     
163. {"Reversed Semicolon", "U0000204f"},
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164. 
       m6 c8 F8 x1 z! j: ]) f. F- v5 ]
165. {"Close Up", "U00002050"},
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166. 
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167. {"Two Asterisks Aligned Vertically", "U00002051"},
     
168. 
     0 m' ^8 M4 H* V" ^& h
169. {"Commercial Minus Sign", "U00002052"},
     
170. 
     
171. {"Swung Dash", "U00002053"},
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172. 
     
173. {"Inverted Undertie", "U00002054"},
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174. 
     
175. {"Flower Punctuation Mark", "U00002055"},
     
176. 
     3 y3 I- O3 X! Z8 I7 F# G
177. {"Three Dot Punctuation", "U00002056"},
     
178. 
     
179. {"Quadruple Prime", "U00002057"},
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180. 
     . m  I3 ], {. w; f# b
181. {"Four Dot Punctuation", "U00002058"},
     
182. 
     . d; V( }- K+ y* `) m
183. {"Five Dot Punctuation", "U00002059"},
     
184. 
     7 {2 p' f+ }! Z3 F# {
185. {"Two Dot Punctuation", "U0000205a"},
     
186. 
     - h: G( @3 E8 Z
187. {"Four Dot Mark", "U0000205b"},
     
188. 
     7 }" n2 F  q/ b
189. {"Dotted Cross", "U0000205c"},
     
190. 
     0 x0 _# `4 q( v
191. {"Tricolon", "U0000205d"},
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192. 
     ' p/ l: G' `& K, e. j* {7 t
193. {"Vertical Four Dots", "U0000205e"},
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194. 
     
195. // {"Medium Mathematical Space", "U0000205f"},
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196. 
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197. // {"Word Joiner", "U00002060"},
     
198. 
     9 t' t) P$ ^- {2 @, i4 u
199. {"Function Application", "U00002061"},
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200. 
     
201. {"Invisible Times", "U00002062"},
     
202. 
     
203. {"Invisible Separator", "U00002063"},
     
204. 
     
205. {"Invisible Plus", "U00002064"},
     , |, c! P) X! ^4 i
206. 
     
207. // {"Left-To-Right Isolate", "U00002066"},
     
208. 
     
209. // {"Right-To-Left Isolate", "U00002067"},
     
210. 
     0 [  }4 b5 n4 s
211. // {"First Strong Isolate", "U00002068"},
     
212. 
     % [3 l) |* {5 S$ D6 O5 d
213. // {"Pop Directional Isolate", "U00002069"},
     7 p  K, w/ |* r
214. 
     4 s& v* h5 m' G5 [9 _( L$ P
215. // {"Inhibit Symmetric Swapping", "U0000206a"},
     
216. 
     $ M9 P4 E# U: k5 V
217. // {"Activate Symmetric Swapping", "U0000206b"},
     
218. 
     
219. // {"Inhibit Arabic Form Shaping", "U0000206c"},
     
220. 
     
221. // {"Activate Arabic Form Shaping", "U0000206d"},
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222. 
     
223. // {"National Digit Shapes", "U0000206e"},
     
224. 
     
225. }
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226. 
     
227. }

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1 \9 a* Q8 b, [  {平常反转一个字符串的时候，我是将它一个一个字符的处理

1. NSString *string = @"一颗赛特123";
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2.     NSLog(@"string1:%@",string);
   
3.     NSMutableString *reverseString = [@"" mutableCopy];
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4.     for (NSInteger i = (string.length - 1); i > -1; i--) {
   
5.         [reverseString appendString:[NSString stringWithFormat:@"%@", [string substringWithRange:NSMakeRange(i, 1)]]];
   
6.     }
   
7.     NSLog(@"reverseString:%@",reverseString);
   
8. 
   
9. // string1:一颗赛特123
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10. // reverseString:321特赛颗一

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那现在就可以这样做了
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1. NSString *string = @"一颗赛特123";
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2.     NSLog(@"string1:%@",string);
   
3.     NSString *tmpString = [NSString stringWithFormat:@"U0000202E%@",string];
   
4.     NSString *reverseString = [tmpString substringFromIndex:1];
   
5.     NSLog(@"tmpString:%@ reverseString:%@",tmpString,reverseString);
   
6. 
   
7. // string1:一颗赛特123
   
8. // tmpString:321特赛颗一
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9. // reverseString:一颗赛特123

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0 i* _: C0 F8 _  `3 I# k1 |8 n7 z: }好吧，字符串里面必须要包含U0000202E字符，实际项目中如果需要计算长度的话，那这样子做是行不通的。
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0 n. u( K" \3 p这种Unicode编码有的时候还是挺有用的，最近在做群聊@功能就用到了&#8197;特殊空格字符（听说微信就是这么做的）。

7 Z9 V$ x, g- \  m原文链接：http://joakimliu.github.io/2016/06/03/%E4%B8%80%E4%BA%9B%E6%9C%89%E8%B6%A3%E7%9A%84%E4%BA%8B/