NSStirng、NSArray、以及枚举(Method小集合)

一下内容由angellixf整理,这里制作记录:

Object-c代码

1. /*******************************************************************************************
2. NSString
3. *******************************************************************************************/
4. //一、NSString
5. /*----------------创建字符串的方法----------------*/
7. //1、创建常量字符串。
8. NSString*astring=@"ThisisaString!";
11. //2、创建空字符串，给予赋值。
13. NSString*astring=[[NSStringalloc]init];
14. astring=@"ThisisaString!";
15. [astringrelease];
16. NSLog(@"astring:%@",astring);
20. //3、在以上方法中，提升速度:initWithString方法
22. NSString*astring=[[NSStringalloc]initWithString:@"ThisisaString!"];
23. NSLog(@"astring:%@",astring);
24. [astringrelease];
28. //4、用标准c创建字符串:initWithCString方法
30. char*Cstring="ThisisaString!";
31. NSString*astring=[[NSStringalloc]initWithCString:Cstring];
32. NSLog(@"astring:%@",astring);
33. [astringrelease];
37. //5、创建格式化字符串:占位符（由一个%加一个字符组成）
39. inti=1;
40. intj=2;
41. NSString*astring=[[NSStringalloc]initWithString:[NSStringstringWithFormat:@"%d.Thisis%istring!",i,j]];
42. NSLog(@"astring:%@",astring);
43. [astringrelease];
47. //6、创建临时字符串
49. NSString*astring;
50. astring=[NSStringstringWithCString:"Thisisatemporarystring"];
51. NSLog(@"astring:%@",astring);
56. /*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/
58. NSString*path=@"astring.text";
59. NSString*astring=[[NSStringalloc]initWithContentsOfFile:path];
60. NSLog(@"astring:%@",astring);
61. [astringrelease];
64. /*----------------写字符串到文件:writeToFile方法----------------*/
67. NSString*astring=[[NSStringalloc]initWithString:@"ThisisaString!"];
68. NSLog(@"astring:%@",astring);
69. NSString*path=@"astring.text";
70. [astringwriteToFile:pathatomically:YES];
71. [astringrelease];
76. /*----------------比较两个字符串----------------*/
78. //用C比较:strcmp函数
80. charstring1[]="string!";
81. charstring2[]="string!";
82. if(strcmp(string1,string2)==0)
83. {
84. NSLog(@"1");
85. }
89. //isEqualToString方法
90. NSString*astring01=@"ThisisaString!";
91. NSString*astring02=@"ThisisaString!";
92. BOOLresult=[astring01isEqualToString:astring02];
93. NSLog(@"result:%d",result);
98. //compare方法(comparer返回的三种值)
99. NSString*astring01=@"ThisisaString!";
100. NSString*astring02=@"ThisisaString!";
101. BOOLresult=[astring01compare:astring02]==NSOrderedSame;
102. NSLog(@"result:%d",result);
103. //NSOrderedSame判断两者内容是否相同
108. NSString*astring01=@"ThisisaString!";
109. NSString*astring02=@"thisisaString!";
110. BOOLresult=[astring01compare:astring02]==NSOrderedAscending;
111. NSLog(@"result:%d",result);
112. //NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
116. NSString*astring01=@"thisisaString!";
117. NSString*astring02=@"ThisisaString!";
118. BOOLresult=[astring01compare:astring02]==NSOrderedDescending;
119. NSLog(@"result:%d",result);
120. //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
124. //不考虑大小写比较字符串1
125. NSString*astring01=@"thisisaString!";
126. NSString*astring02=@"ThisisaString!";
127. BOOLresult=[astring01caseInsensitiveCompare:astring02]==NSOrderedSame;
128. NSLog(@"result:%d",result);
129. //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
133. //不考虑大小写比较字符串2
134. NSString*astring01=@"thisisaString!";
135. NSString*astring02=@"ThisisaString!";
136. BOOLresult=[astring01compare:astring02
137. options:NSCaseInsensitiveSearch|NSNumericSearch]==NSOrderedSame;
138. NSLog(@"result:%d",result);
140. //NSCaseInsensitiveSearch:不区分大小写比较NSLiteralSearch:进行完全比较，区分大小写NSNumericSearch:比较字符串的字符个数，而不是字符值。
143. /*----------------改变字符串的大小写----------------*/
145. NSString*string1=@"AString";
146. NSString*string2=@"String";
147. NSLog(@"string1:%@",[string1uppercaseString]);//大写
148. NSLog(@"string2:%@",[string2lowercaseString]);//小写
149. NSLog(@"string2:%@",[string2capitalizedString]);//首字母大小
152. /*----------------在串中搜索子串----------------*/
154. NSString*string1=@"Thisisastring";
155. NSString*string2=@"string";
156. NSRangerange=[string1rangeOfString:string2];
157. intlocation=range.location;
158. intleight=range.length;
159. NSString*astring=[[NSStringalloc]initWithString:[NSStringstringWithFormat:@"Location:%i,Leight:%i",location,leight]];
160. NSLog(@"astring:%@",astring);
161. [astringrelease];
164. /*----------------抽取子串----------------*/
166. //-substringToIndex:从字符串的开头一直截取到指定的位置，但不包括该位置的字符
167. NSString*string1=@"Thisisastring";
168. NSString*string2=[string1substringToIndex:3];
169. NSLog(@"string2:%@",string2);
174. //-substringFromIndex:以指定位置开始（包括指定位置的字符），并包括之后的全部字符
175. NSString*string1=@"Thisisastring";
176. NSString*string2=[string1substringFromIndex:3];
177. NSLog(@"string2:%@",string2);
182. //-substringWithRange://按照所给出的位置，长度，任意地从字符串中截取子串
183. NSString*string1=@"Thisisastring";
184. NSString*string2=[string1substringWithRange:NSMakeRange(0,4)];
185. NSLog(@"string2:%@",string2);
188. //扩展路径
190. NSString*Path=@"~/NSData.txt";
191. NSString*absolutePath=[PathstringByExpandingTildeInPath];
192. NSLog(@"absolutePath:%@",absolutePath);
193. NSLog(@"Path:%@",[absolutePathstringByAbbreviatingWithTildeInPath]);
197. //文件扩展名
198. NSString*Path=@"~/NSData.txt";
199. NSLog(@"Extension:%@",[PathpathExtension]);
204. /*******************************************************************************************
205. NSMutableString
206. *******************************************************************************************/
208. /*---------------给字符串分配容量----------------*/
209. //stringWithCapacity:
210. NSMutableString*String;
211. String=[NSMutableStringstringWithCapacity:40];
214. /*---------------在已有字符串后面添加字符----------------*/
216. //appendString:andappendFormat:
218. NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
219. //[String1appendString:@",Iwillbeaddingsomecharacter"];
220. [String1appendFormat:[NSStringstringWithFormat:@",Iwillbeaddingsomecharacter"]];
221. NSLog(@"String1:%@",String1);
222. */
225. /*--------在已有字符串中按照所给出范围和长度删除字符------*/
226. /*
227. //deleteCharactersInRange:
228. NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
229. [String1deleteCharactersInRange:NSMakeRange(0,5)];
230. NSLog(@"String1:%@",String1);
234. /*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/
236. //-insertString:atIndex:
237. NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
238. [String1insertString:@"Hi!"atIndex:0];
239. NSLog(@"String1:%@",String1);
243. /*--------将已有的空符串换成其它的字符串------*/
245. //-setString:
246. NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
247. [String1setString:@"HelloWord!"];
248. NSLog(@"String1:%@",String1);
252. /*--------按照所给出的范围，和字符串替换的原有的字符------*/
254. //-setString:
255. NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
256. [String1replaceCharactersInRange:NSMakeRange(0,4)withString:@"That"];
257. NSLog(@"String1:%@",String1);
261. /*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
262. //01：检查字符串是否以另一个字符串开头-(BOOL)hasPrefix:(NSString*)aString;
263. NSString*String1=@"NSStringInformation.txt";
264. [String1hasPrefix:@"NSString"]==1?NSLog(@"YES"):NSLog(@"NO");
265. [String1hasSuffix:@".txt"]==1?NSLog(@"YES"):NSLog(@"NO");
267. //02：查找字符串某处是否包含其它字符串-(NSRange)rangeOfString:(NSString*)aString，这一点前面在串中搜索子串用到过;
271. /*******************************************************************************************
272. NSArray
273. *******************************************************************************************/
275. /*---------------------------创建数组------------------------------*/
276. //NSArray*array=[[NSArrayalloc]initWithObjects:
277. @"One",@"Two",@"Three",@"Four",nil];
279. self.dataArray=array;
280. [arrayrelease];
282. //-(unsigned)Count;数组所包含对象个数；
283. NSLog(@"self.dataArraycound:%d",[self.dataArraycount]);
285. //-(id)objectAtIndex:(unsignedint)index;获取指定索引处的对象;
286. NSLog(@"self.dataArraycound2:%@",[self.dataArrayobjectAtIndex:2]);
289. /*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
291. //arrayWithArray:
292. //NSArray*array1=[[NSArrayalloc]init];
293. NSMutableArray*MutableArray=[[NSMutableArrayalloc]init];
294. NSArray*array=[NSArrayarrayWithObjects:
295. @"a",@"b",@"c",nil];
296. NSLog(@"array:%@",array);
297. MutableArray=[NSMutableArrayarrayWithArray:array];
298. NSLog(@"MutableArray:%@",MutableArray);
300. array1=[NSArrayarrayWithArray:array];
301. NSLog(@"array1:%@",array1);
304. //Copy
306. //idobj;
307. NSMutableArray*newArray=[[NSMutableArrayalloc]init];
308. NSArray*oldArray=[NSArrayarrayWithObjects:
309. @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
311. NSLog(@"oldArray:%@",oldArray);
312. for(inti=0;i<[oldArraycount];i++)
313. {
314. obj=[[oldArrayobjectAtIndex:i]copy];
315. [newArrayaddObject:obj];
316. }
317. //
318. NSLog(@"newArray:%@",newArray);
319. [newArrayrelease];
322. //快速枚举
324. //NSMutableArray*newArray=[[NSMutableArrayalloc]init];
325. NSArray*oldArray=[NSArrayarrayWithObjects:
326. @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
327. NSLog(@"oldArray:%@",oldArray);
329. for(idobjinoldArray)
330. {
331. [newArrayaddObject:obj];
332. }
333. //
334. NSLog(@"newArray:%@",newArray);
335. [newArrayrelease];
338. //Deepcopy
340. //NSMutableArray*newArray=[[NSMutableArrayalloc]init];
341. NSArray*oldArray=[NSArrayarrayWithObjects:
342. @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
343. NSLog(@"oldArray:%@",oldArray);
344. newArray=(NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault,(CFPropertyListRef)oldArray,kCFPropertyListMutableContainers);
345. NSLog(@"newArray:%@",newArray);
346. [newArrayrelease];
349. //Copyandsort
351. //NSMutableArray*newArray=[[NSMutableArrayalloc]init];
352. NSArray*oldArray=[NSArrayarrayWithObjects:
353. @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
354. NSLog(@"oldArray:%@",oldArray);
355. NSEnumerator*enumerator;
356. enumerator=[oldArrayobjectEnumerator];
357. idobj;
358. while(obj=[enumeratornextObject])
359. {
360. [newArrayaddObject:obj];
361. }
362. [newArraysortUsingSelector:@selector(compare:)];
363. NSLog(@"newArray:%@",newArray);
364. [newArrayrelease];
368. /*---------------------------切分数组------------------------------*/
370. //从字符串分割到数组－componentsSeparatedByString:
371. NSString*string=[[NSStringalloc]initWithString:@"One,Two,Three,Four"];
372. NSLog(@"string:%@",string);
373. NSArray*array=[stringcomponentsSeparatedByString:@","];
374. NSLog(@"array:%@",array);
375. [stringrelease];
378. //从数组合并元素到字符串-componentsJoinedByString:
379. NSArray*array=[[NSArrayalloc]initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
380. NSString*string=[arraycomponentsJoinedByString:@","];
381. NSLog(@"string:%@",string);
385. /*******************************************************************************************
386. NSMutableArray
387. *******************************************************************************************/
388. /*---------------给数组分配容量----------------*/
389. //NSArray*array;
390. array=[NSMutableArrayarrayWithCapacity:20];
394. /*--------------在数组末尾添加对象----------------*/
395. //-(void)addObject:(id)anObject;
396. //NSMutableArray*array=[NSMutableArrayarrayWithObjects:
397. @"One",@"Two",@"Three",nil];
398. [arrayaddObject:@"Four"];
399. NSLog(@"array:%@",array);
403. /*--------------删除数组中指定索引处对象----------------*/
404. //-(void)removeObjectAtIndex:(unsigned)index;
405. //NSMutableArray*array=[NSMutableArrayarrayWithObjects:
406. @"One",@"Two",@"Three",nil];
407. [arrayremoveObjectAtIndex:1];
408. NSLog(@"array:%@",array);
412. /*-------------数组枚举---------------*/
413. //-(NSEnumerator*)objectEnumerator;从前向后
414. //NSMutableArray*array=[NSMutableArrayarrayWithObjects:
415. @"One",@"Two",@"Three",nil];
416. NSEnumerator*enumerator;
417. enumerator=[arrayobjectEnumerator];
419. idthingie;
420. while(thingie=[enumeratornextObject]){
421. NSLog(@"thingie:%@",thingie);
422. }
425. //-(NSEnumerator*)reverseObjectEnumerator;从后向前
426. //NSMutableArray*array=[NSMutableArrayarrayWithObjects:
427. @"One",@"Two",@"Three",nil];
428. NSEnumerator*enumerator;
429. enumerator=[arrayreverseObjectEnumerator];
431. idobject;
432. while(object=[enumeratornextObject]){
433. NSLog(@"object:%@",object);
434. }
437. //快速枚举
438. //NSMutableArray*array=[NSMutableArrayarrayWithObjects:
439. @"One",@"Two",@"Three",nil];
440. for(NSString*stringinarray)
441. {
442. NSLog(@"string:%@",string);
443. }
447. /*******************************************************************************************
448. NSDictionary
449. *******************************************************************************************/
451. /*------------------------------------创建字典------------------------------------*/
452. //-(id)initWithObjectsAndKeys;
454. //NSDictionary*dictionary=[[NSDictionaryalloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
455. NSString*string=[dictionaryobjectForKey:@"One"];
456. NSLog(@"string:%@",string);
457. NSLog(@"dictionary:%@",dictionary);
458. [dictionaryrelease];
461. /*******************************************************************************************
462. NSMutableDictionary
463. *******************************************************************************************/
465. /*------------------------------------创建可变字典------------------------------------*/
466. //创建
467. NSMutableDictionary*dictionary=[NSMutableDictionarydictionary];
469. //添加字典
470. [dictionarysetObject:@"One"forKey:@"1"];
471. [dictionarysetObject:@"Two"forKey:@"2"];
472. [dictionarysetObject:@"Three"forKey:@"3"];
473. [dictionarysetObject:@"Four"forKey:@"4"];
474. NSLog(@"dictionary:%@",dictionary);
476. //删除指定的字典
477. [dictionaryremoveObjectForKey:@"3"];
478. NSLog(@"dictionary:%@",dictionary);
481. /*******************************************************************************************
482. NSValue（对任何对象进行包装）
483. *******************************************************************************************/
485. /*--------------------------------将NSRect放入NSArray中------------------------------------*/
486. //将NSRect放入NSArray中
487. NSMutableArray*array=[[NSMutableArrayalloc]init];
488. NSValue*value;
489. CGRectrect=CGRectMake(0,0,320,480);
490. value=[NSValuevalueWithBytes:&rectobjCType:@encode(CGRect)];
491. [arrayaddObject:value];
492. NSLog(@"array:%@",array);
494. //从Array中提取
495. value=[arrayobjectAtIndex:0];
496. [valuegetValue:&rect];
497. NSLog(@"value:%@",value);
500. /*******************************************************************************************
501. 从目录搜索扩展名为jpg的文件
502. *******************************************************************************************/
504. //NSFileManager*fileManager=[NSFileManagerdefaultManager];
505. NSString*home;
506. home=@"../Users/";
508. NSDirectoryEnumerator*direnum;
509. direnum=[fileManagerenumeratorAtPath:home];
511. NSMutableArray*files=[[NSMutableArrayalloc]init];
513. //枚举
514. NSString*filename;
515. while(filename=[direnumnextObject]){
516. if([[filenamepathExtension]hasSuffix:@"jpg"]){
517. [filesaddObject:filename];
518. }
519. }
521. //快速枚举
522. //for(NSString*filenameindirenum)
523. //{
524. //if([[filenamepathExtension]isEqualToString:@"jpg"]){
525. //[filesaddObject:filename];
526. //}
527. //}
528. NSLog(@"files:%@",files);
530. //枚举
531. NSEnumerator*filenum;
532. filenum=[filesobjectEnumerator];
533. while(filename=[filenumnextObject]){
534. NSLog(@"filename:%@",filename);
535. }
537. //快速枚举
538. //for(idobjectinfiles)
539. //{
540. //NSLog(@"object:%@",object);
541. //}