1 /*-------创建一个数组，并初始化数组为输入值，然后写入-----------*/
  2 NSDictionary *RegisterDic_ = [[NSDictionaryalloc] initWithObjects:
  3 　　　　　　　　　　　　　　　　　　　　　　　　[NSArrayarrayWithObjects:_userNameTextField.text,_passwordTextField.text,_emailTextField.text, nil] 
  4 　　　　　　　　　　　　　　　　　　　　　　　　forKeys: [NSArrayarrayWithObjects:@"username",@"password",@"email",nil]];
  5 
  6 NSString * homebrew = @"imperial india pale Ale(ipa)";
  7 //从第25开始，获取三个字符
  8 NSRange range =NSMakeRange(25, 3);
  9 //以下代码等价
 10 // NSRange range ={25,3};
 11 //对字符串取子串
 12 NSLog(@"beer shortname %@",[homebrew substringWithRange:range]);
 13 
 14 //搜索字符串，输出range is{25,3}
 15 NSRange range = [homebrew rangeOfString:@"ipa"];
 16 //判断是否找到字符串
 17 if (range.length]] > 0)
 18 {
 19 NSLog(@"%@",NSStringFromRect(range));
 20 }
 21 
 22 
 23 在iphone中，除了系统的颜色之外，我们还可以自定义颜色，下面有两种方式：
 24 UIColor *newColor = [[UIColor alloc] initWithRed:(float) green:(float) blue:(float) alpha:(float)];
 25 
 26 //alpha： 0.0~1.0
 27 
 28 UIColor *tiniColor =
 29 
 30 [UIColor colorWithRed:255/255.0 green:175/255.0 blue:64/255.0 alpha:1.0];
 31 
 32 修改navigationbar的背景颜色
 33 
 34 
 35 可以修改navigationbar的tintcolor属性来达到目的，
 36 
 37 self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:200/255.0f green:200/255.0f blue:184/255.0f alpha:1.0f];
 38 /*******************************************************************************************
 39 NSString
 40 *******************************************************************************************/
 41 //一、NSString
 42 /*----------------创建字符串的方法----------------*/
 43 //获取文件路径 NSString *path =[ [NSBundle mainBundle] pathForResource:@"test"ofType:@"png"];
 44 NSFileManager *fm = [NSFileManagerdefaultManager];
 45 if([fm fileExistsAtPath:path])
 46 NSLog(@"yes");
 47 else
 48 NSLog(@"no");
 49 
 50 //1、创建常量字符串。
 51 NSString *astring = @"This is a String!";
 52 
 53 //2、创建空字符串，给予赋值。
 54 
 55 NSString *astring = [[NSString alloc] init];
 56 astring = @"This is a String!";
 57 [astring release];
 58 NSLog(@"astring:%@",astring);
 59 
 60 //3、在以上方法中，提升速度:initWithString方法
 61 
 62 NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
 63 NSLog(@"astring:%@",astring);
 64 [astring release];
 65 
 66 //4、用标准c创建字符串:initWithCString方法
 67 
 68 char *Cstring = "This is a String!";
 69 NSString *astring = [[NSString alloc] initWithCString:Cstring];
 70 NSLog(@"astring:%@",astring);
 71 [astring release];
 72 
 73 //5、创建格式化字符串:占位符（由一个%加一个字符组成）
 74 
 75 int i = 1;
 76 int j = 2;
 77 NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
 78 NSLog(@"astring:%@",astring);
 79 [astring release];
 80 
 81 //6、创建临时字符串
 82 
 83 NSString *astring;
 84 astring = [NSString stringWithCString:"This is a temporary string"];
 85 NSLog(@"astring:%@",astring);
 86 
 87 /*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/
 88 
 89 NSString *path = @"astring.text";
 90 NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
 91 NSLog(@"astring:%@",astring);
 92 [astring release];
 93 //打开指定路径上的文本文件，并使用文件内容初始化一个字符串；
 94 /*----------------写字符串到文件:writeToFile方法----------------*/
 95 
 96 NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
 97 NSLog(@"astring:%@",astring);
 98 NSString *path = @"astring.text";
 99 [astring writeToFile: path atomically: YES];
100 [astring release];
101 
102 /*----------------比较两个字符串----------------*/
103 
104 //用C比较:strcmp函数
105 
106 char string1[] = "string!";
107 char string2[] = "string!";
108 if(strcmp(string1, string2) = = 0)
109 {
110 NSLog(@"1");
111 }
112 
113 //isEqualToString方法
114 NSString *astring01 = @"This is a String!";
115 NSString *astring02 = @"This is a String!";
116 BOOL result = [astring01 isEqualToString:astring02];
117 NSLog(@"result:%d",result);
118 
119 //compare方法(comparer返回的三种值)
120 NSString *astring01 = @"This is a String!";
121 NSString *astring02 = @"This is a String!";
122 BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
123 NSLog(@"result:%d",result);
124 //NSOrderedSame判断两者内容是否相同
125 
126 NSString *astring01 = @"This is a String!";
127 NSString *astring02 = @"this is a String!";
128 BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
129 NSLog(@"result:%d",result);
130 //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)
131 
132 NSString *astring01 = @"this is a String!";
133 NSString *astring02 = @"This is a String!";
134 BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
135 NSLog(@"result:%d",result);
136 //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)
137 
138 //不考虑大小写比较字符串1
139 NSString *astring01 = @"this is a String!";
140 NSString *astring02 = @"This is a String!";
141 BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
142 NSLog(@"result:%d",result);
143 //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)
144 
145 //不考虑大小写比较字符串2
146 NSString *astring01 = @"this is a String!";
147 NSString *astring02 = @"This is a String!";
148 BOOL result = [astring01 compare:astring02
149 options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
150 NSLog(@"result:%d",result);
151 
152 //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。
153 
154 /*----------------改变字符串的大小写----------------*/
155 
156 NSString *string1 = @"A String";
157 NSString *string2 = @"String";
158 NSLog(@"string1:%@",[string1 uppercaseString]);//大写
159 NSLog(@"string2:%@",[string2 lowercaseString]);//小写
160 NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
161 
162 /*----------------在串中搜索子串----------------*/
163 
164 NSString *string1 = @"This is a string";
165 NSString *string2 = @"string";
166 NSRange range = [string1 rangeOfString:string2];
167 int location = range.location;//位置
168 int leight = range.length;//長度
169 NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
170 NSLog(@"astring:%@",astring);
171 [astring release];
172 /*----------------判断字符串里是否有此字符串----------------*/
173 
174 NSRange range = [fileName rangeOfString:@"."];
175 if (range.length==0)
176 
177 
178 /*----------------抽取子串 ----------------*/
179 
180 //-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
181 NSString *string1 = @"This is a string";
182 NSString *string2 = [string1 substringToIndex:3];
183 NSLog(@"string2:%@",string2);
184 
185 //-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
186 NSString *string1 = @"This is a string";
187 NSString *string2 = [string1 substringFromIndex:3];
188 NSLog(@"string2:%@",string2);
189 
190 //-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
191 NSString *string1 = @"This is a string";
192 NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
193 NSLog(@"string2:%@",string2);
194 
195 
196 //扩展路径
197 NSString *Path = @"~/NSData.txt";
198 NSString *absolutePath = [Path stringByExpandingTildeInPath];
199 NSLog(@"absolutePath:%@",absolutePath);
200 NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
201 
202 //文件扩展名
203 NSString *Path = @"~/NSData.txt";
204 NSLog(@"Extension:%@",[Path pathExtension]);
205 
206 /*******************************************************************************************
207 NSMutableString
208 *******************************************************************************************/
209 
210 /*---------------给字符串分配容量----------------*/
211 //stringWithCapacity:
212 NSMutableString *String;
213 String = [NSMutableString stringWithCapacity:40];
214 //容量只是建议的最优值，而不是最大值
215 
216 /*---------------在已有字符串后面添加字符----------------*/
217 
218 //appendString: and appendFormat:
219 
220 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
221 //[String1 appendString:@", I will be adding some character"];
222 [String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
223 NSLog(@"String1:%@",String1);
224 */
225 
226 /*--------在已有字符串中按照所给出范围和长度删除字符------*/
227 /*
228 //deleteCharactersInRange:
229 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
230 [String1 deleteCharactersInRange:NSMakeRange(0, 5)];
231 NSLog(@"String1:%@",String1);
232 //
233 [string1 deleteCharacterslnRange]:(NSRange *)range;
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------*/
235 
236 //-insertString: atIndex:
237 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
238 [String1 insertString:@"Hi! " atIndex:0];
239 NSLog(@"String1:%@",String1);
240 
241 
242 /*--------将已有的空符串换成其它的字符串------*/
243 
244 //-setString:
245 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
246 [String1 setString:@"Hello Word!"];
247 NSLog(@"String1:%@",String1);
248 
249 /*--------按照所给出的范围，和字符串替换的原有的字符------*/
250 //-setString:
251 NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
252 [String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
253 NSLog(@"String1:%@",String1);
254 //删除原有字符，替换新字符串
255 /*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
256 //01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;
257 NSString *String1 = @"NSStringInformation.txt";
258 [String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
259 /02：-------------检查方法调用字符串是否以此方法结尾-------------*/
260 [String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
261 
262 //03：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;
263 /*******************************************************************************************
264 NSArray
265 *******************************************************************************************/
266 
267 /*---------------------------创建数组------------------------------*/
268 //NSArray *array = [[NSArray alloc] initWithObjects:
269 @"One",@"Two",@"Three",@"Four",nil];
270 
271 
272 self.dataArray = array;
273 [array release];
274 
275 
276 //- (unsigned) Count;数组所包含对象个数；
277 NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
278 
279 
280 //- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;
281 NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
282 
283 
284 /*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
285 
286 
287 //直接复制:
288 //创建两个空数组
289 NSArray *array1 = [[NSArray alloc] init];
290 NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
291 //创建数组并赋值
292 NSArray *array = [NSArray arrayWithObjects:
293 @"a",@"b",@"c",nil];
294 NSLog(@"array:%@",array);
295 //把array数组赋给空数组
296 MutableArray = [NSMutableArray arrayWithArray:array];
297 NSLog(@"MutableArray:%@",MutableArray);
298 
299 
300 array1 = [NSArray arrayWithArray:array];
301 NSLog(@"array1:%@",array1);
302 //Copy
303 id obj;
304 NSMutableArray *newArray = [[NSMutableArray alloc] init];
305 NSArray *oldArray = [NSArray arrayWithObjects:
306 @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
307 
308 
309 NSLog(@"oldArray:%@",oldArray);
310 for(int i = 0; i < [oldArray count]; i++)
311 {
312 obj = [[oldArray objectAtIndex:i] copy];
313 [newArray addObject: obj];
314 }
315 //
316 NSLog(@"newArray:%@", newArray);
317 [newArray release];
318 
319 
320 //快速枚举
321 
322 
323 //NSMutableArray *newArray = [[NSMutableArray alloc] init];
324 NSArray *oldArray = [NSArray arrayWithObjects:
325 @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
326 NSLog(@"oldArray:%@",oldArray);
327 
328 
329 for(id obj in oldArray)
330 {
331 [newArray addObject: obj];
332 }
333 //
334 NSLog(@"newArray:%@", newArray);
335 [newArray release];
336 
337 
338 //Deep copy
339 
340 
341 //NSMutableArray *newArray = [[NSMutableArray alloc] init];
342 NSArray *oldArray = [NSArray arrayWithObjects:
343 @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
344 NSLog(@"oldArray:%@",oldArray);
345 newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
346 NSLog(@"newArray:%@", newArray);
347 [newArray release];
348 
349 
350 //Copy and sort
351 
352 
353 //NSMutableArray *newArray = [[NSMutableArray alloc] init];
354 NSArray *oldArray = [NSArray arrayWithObjects:
355 @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
356 NSLog(@"oldArray:%@",oldArray);
357 NSEnumerator *enumerator;
358 enumerator = [oldArray objectEnumerator];
359 id obj;
360 while(obj = [enumerator nextObject])
361 {
362 [newArray addObject: obj];
363 }
364 [newArray sortUsingSelector:@selector(compare:)];
365 NSLog(@"newArray:%@", newArray);
366 [newArray release];
367 
368 
369 /*---------------------------切分数组------------------------------*/
370 
371 
372 //从字符串分割到数组－ componentsSeparatedByString:
373 NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
374 NSLog(@"string:%@",string);
375 NSArray *array = [string componentsSeparatedByString:@","];
376 NSLog(@"array:%@",array);
377 [string release];
378 
379 
380 //从数组合并元素到字符串- componentsJoinedByString:
381 NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
382 NSString *string = [array componentsJoinedByString:@","];
383 NSLog(@"string:%@",string);
384 
385 
386 /*******************************************************************************************
387 NSMutableArray 可变数组
388 *******************************************************************************************/
389 /*---------------给数组分配容量----------------*/
390 //NSArray *array;
391 array = [NSMutableArray arrayWithCapacity:20];
392 
393 
394 /*--------------在数组末尾添加对象----------------*/
395 //- (void) addObject: (id) anObject;
396 //NSMutableArray *array = [NSMutableArray arrayWithObjects:
397 @"One",@"Two",@"Three",nil];
398 [array addObject:@"Four"];
399 NSLog(@"array:%@",array);
400 
401 
402 /*--------------删除数组中指定索引处对象----------------*/
403 //-(void) removeObjectAtIndex: (unsigned) index;
404 //NSMutableArray *array = [NSMutableArray arrayWithObjects:
405 @"One",@"Two",@"Three",nil];
406 [array removeObjectAtIndex:1];
407 NSLog(@"array:%@",array);
408 //被删除对象后面的数组元素被前移来填补空缺
409 
410  
411 
412 /*-------------数组枚举---------------*/
413 //遍历索引
414 int i;
415 for (i=0; i<[array1 count]; i++)
416 {
417 NSLog(@"index %d has %@",i,[array1 objectAtIndex:i]);
418 }
419 //功能最强大
420 
421  
422 
423 //- (NSEnumerator *)objectEnumerator;从前向后
424 //NSMutableArray *array = [NSMutableArray arrayWithObjects:
425 @"One",@"Two",@"Three",nil];
426 NSEnumerator *enumerator;
427 enumerator = [array objectEnumerator];
428 //创建一个泛型对象
429 id thingie;
430 //访问枚举数组的下一个对象，为nil时停止
431 while (thingie = [enumerator nextObject])
432 
433 
434 {
435 NSLog(@"thingie:%@",thingie);
436 }
437 
438 
439 //- (NSEnumerator *)reverseObjectEnumerator;从后向前
440 //NSMutableArray *array = [NSMutableArray arrayWithObjects:
441 @"One",@"Two",@"Three",nil];
442 NSEnumerator *enumerator;
443 enumerator = [array reverseObjectEnumerator];
444 
445 
446 id object;
447 while (object = [enumerator nextObject]) {
448 NSLog(@"object:%@",object);
449 }
450 //对可变数组进行遍历操作，对可变数据进行添加删除后，enumerator遍历的是之前创建的数组，不会时时更新；
451 
452 
453 //快速枚举
454 //NSMutableArray *array = [NSMutableArray arrayWithObjects:
455 @"One",@"Two",@"Three",nil];
456 for(NSString *string in array)
457 {
458 NSLog(@"string:%@",string);
459 }
460 NSmutableArray 常用方法总结array 创建一个空数组 +(id)arrayWithCapacity:size 创建一个数组，指定容量为size -(id)initWithCapacity:size 初始化一个新分配的数组，指定容量为size -(void)addObject:obj 将对象obj添加到数组末尾 -(void)insertObject:obj atIndex:i 将对象 obj 插入到索引为 i 的位置 -(void)replaceObject:obj atIndex:i 将数组中索引为 i 处的元素用obj 置换 -(void)removeObject:obj 从数组中删除所有是 obj 的对象 -(void)removeObjectAtIndex:i 从数组中删除索引为 i 的对像 -(void)sortUsingSelector:(SEL)selector 用 selector 只是的比较方法将数组排序
461 /*******************************************************************************************
462 NSDictionary
463 *******************************************************************************************/
464 
465 
466 /*------------------------------------创建字典------------------------------------*/
467 //- (id) initWithObjectsAndKeys;
468 
469 
470 NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
471 NSString *string = [dictionary objectForKey:@"One"];
472 NSLog(@"string:%@",string);
473 NSLog(@"dictionary:%@",dictionary);
474 [dictionary release];
475 
476 
477 //
478 NSDictionary * tires;
479 
480 tires =[NSDictionary dictionaryWithObjectsAndKeys:
481 t1,@"1"
482 ,t2,@"2"
483 ,t3,@"3"
484 ,t4,@"4"
485 ,nil];
486 NSLog(@"%@",tires);
487 
488  
489 
490 
491 /*******************************************************************************************
492 NSMutableDictionary
493 *******************************************************************************************/
494 
495 
496 /*------------------------------------创建可变字典------------------------------------*/
497 //创建
498 NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
499 //添加字典
500 [dictionary setObject:@"One" forKey:@"1"];
501 [dictionary setObject:@"Two" forKey:@"2"];
502 [dictionary setObject:@"Three" forKey:@"3"];
503 [dictionary setObject:@"Four" forKey:@"4"];
504 NSLog(@"dictionary:%@",dictionary);
505 //若已经存在该关键字，则会用新值替换原有值
506 
507  
508 
509 //删除指定的字典
510 [dictionary removeObjectForKey:@"3"];
511 NSLog(@"dictionary:%@",dictionary);
512 
513 
514 /*******************************************************************************************
515 NSValue（对任何对象进行包装）
516 *******************************************************************************************/
517 
518 
519 /*--------------------------------将NSRect放入NSArray中------------------------------------*/
520 //将NSRect放入NSArray中
521 NSMutableArray *array = [[NSMutableArray alloc] init];
522 NSValue *value;
523 CGRect rect = CGRectMake(0, 0, 320, 480);
524 value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
525 [array addObject:value];
526 NSLog(@"array:%@",array);
527 
528 
529 //从Array中提取
530 value = [array objectAtIndex:0];
531 [value getValue:&rect];
532 NSLog(@"value:%@",value);
533 
534 
535 /*******************************************************************************************
536 从目录搜索扩展名为jpg的文件
537 *******************************************************************************************/
538 
539 
540 //NSFileManager *fileManager = [NSFileManager defaultManager];
541 NSString *home;
542 home = @"../Users/";
543 
544 
545 NSDirectoryEnumerator *direnum;
546 direnum = [fileManager enumeratorAtPath: home];
547 
548 NSMutableArray *files = [[NSMutableArray alloc] init];
549 
550 
551 //枚举
552 NSString *filename;
553 while (filename = [direnum nextObject]) {
554 if([[filename pathExtension] hasSuffix:@"jpg"]){
555 [files addObject:filename];
556 }
557 }
558 
559 
560 //快速枚举
561 //for(NSString *filename in direnum)
562 //{
563 // if([[filename pathExtension] isEqualToString:@"jpg"]){
564 // [files addObject:filename];
565 // }
566 //}
567 NSLog(@"files:%@",files);
568 
569 
570 //枚举
571 NSEnumerator *filenum;
572 filenum = [files objectEnumerator];
573 while (filename = [filenum nextObject]) {
574 NSLog(@"filename:%@",filename);
575 }
576 
577 
578 //快速枚举
579 //for(id object in files)
580 //{
581 // NSLog(@"object:%@",object);
582 //
583 /*******************************************************************************************
584 NSNumber
585 *******************************************************************************************/
586 //封装数据对象
587 [NSNumber numberWithChar:(char)value];
588 [NSNumber numberWithChar:(char)value];
589 
590 [NSNumber numberWithChar:(char)value];
591 
592 [NSNumber numberWithChar:(char)value];
593 
594 [NSNumber numberWithChar:(char)value];