主题：NSStirng、NSArray、以及枚举(Method小集合)

主题：NSStirng、NSArray、以及枚举(Method小集合)    查看完整版    作者：colddawn  时间：2010-04-08 06:34

 

标题：        作者：xiexinit  时间：2010-04-08 06:39
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标题：NSStirng、NSArray、以及枚举(Method小集合)        作者：colddawn  时间：2010-04-08 06:34
Object-c代码   /*******************************************************************************************   NSString   *******************************************************************************************/   //一、NSString   /*----------------创建字符串的方法----------------*/       //1、创建常量字符串。   NSString *astring = @"This is a String!";           //2、创建空字符串，给予赋值。       NSString *astring = [[NSString alloc] init];   astring = @"This is a String!";   [astring release];   NSLog(@"astring:%@",astring);               //3、在以上方法中，提升速度:initWithString方法       NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];   NSLog(@"astring:%@",astring);   [astring release];               //4、用标准c创建字符串:initWithCString方法       char *Cstring = "This is a String!";   NSString *astring = [[NSString alloc] initWithCString:Cstring];   NSLog(@"astring:%@",astring);   [astring release];               //5、创建格式化字符串:占位符（由一个%加一个字符组成）       int i = 1;   int j = 2;   NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];   NSLog(@"astring:%@",astring);   [astring release];               //6、创建临时字符串       NSString *astring;   astring = [NSString stringWithCString:"This is a temporary string"];   NSLog(@"astring:%@",astring);                   /*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/       NSString *path = @"astring.text";   NSString *astring = [[NSString alloc] initWithContentsOfFile:path];   NSLog(@"astring:%@",astring);   [astring release];           /*----------------写字符串到文件:writeToFile方法----------------*/           NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];   NSLog(@"astring:%@",astring);   NSString *path = @"astring.text";   [astring writeToFile: path atomically: YES];   [astring release];                   /*----------------比较两个字符串----------------*/       //用C比较:strcmp函数       char string1[] = "string!";   char string2[] = "string!";   if(strcmp(string1, string2) = = 0)   {   NSLog(@"1");   }               //isEqualToString方法   NSString *astring01 = @"This is a String!";   NSString *astring02 = @"This is a String!";   BOOL result = [astring01 isEqualToString:astring02];   NSLog(@"result:%d",result);                   //compare方法(comparer返回的三种值)   NSString *astring01 = @"This is a String!";   NSString *astring02 = @"This is a String!";   BOOL result = [astring01 compare:astring02] = = NSOrderedSame;   NSLog(@"result:%d",result);   //NSOrderedSame判断两者内容是否相同                   NSString *astring01 = @"This is a String!";   NSString *astring02 = @"this is a String!";   BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;   NSLog(@"result:%d",result);   //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)               NSString *astring01 = @"this is a String!";   NSString *astring02 = @"This is a String!";   BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;   NSLog(@"result:%d",result);   //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)               //不考虑大小写比较字符串1   NSString *astring01 = @"this is a String!";   NSString *astring02 = @"This is a String!";   BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;   NSLog(@"result:%d",result);   //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)               //不考虑大小写比较字符串2   NSString *astring01 = @"this is a String!";   NSString *astring02 = @"This is a String!";   BOOL result = [astring01 compare:astring02   options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;   NSLog(@"result:%d",result);       //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。           /*----------------改变字符串的大小写----------------*/       NSString *string1 = @"A String";   NSString *string2 = @"String";   NSLog(@"string1:%@",[string1 uppercaseString]);//大写   NSLog(@"string2:%@",[string2 lowercaseString]);//小写   NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小           /*----------------在串中搜索子串----------------*/       NSString *string1 = @"This is a string";   NSString *string2 = @"string";   NSRange range = [string1 rangeOfString:string2];   int location = range.location;   int leight = range.length;   NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];   NSLog(@"astring:%@",astring);   [astring release];           /*----------------抽取子串 ----------------*/       //-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   NSString *string1 = @"This is a string";   NSString *string2 = [string1 substringToIndex:3];   NSLog(@"string2:%@",string2);                   //-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   NSString *string1 = @"This is a string";   NSString *string2 = [string1 substringFromIndex:3];   NSLog(@"string2:%@",string2);                   //-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串   NSString *string1 = @"This is a string";   NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];   NSLog(@"string2:%@",string2);           //扩展路径       NSString *Path = @"~/NSData.txt";   NSString *absolutePath = [Path stringByExpandingTildeInPath];   NSLog(@"absolutePath:%@",absolutePath);   NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);               //文件扩展名   NSString *Path = @"~/NSData.txt";   NSLog(@"Extension:%@",[Path pathExtension]);                   /*******************************************************************************************   NSMutableString   *******************************************************************************************/       /*---------------给字符串分配容量----------------*/   //stringWithCapacity:   NSMutableString *String;   String = [NSMutableString stringWithCapacity:40];           /*---------------在已有字符串后面添加字符----------------*/       //appendString: and appendFormat:       NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];   //[String1 appendString:@", I will be adding some character"];   [String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];   NSLog(@"String1:%@",String1);   */           /*--------在已有字符串中按照所给出范围和长度删除字符------*/   /*   //deleteCharactersInRange:   NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];   [String1 deleteCharactersInRange:NSMakeRange(0, 5)];   NSLog(@"String1:%@",String1);               /*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/       //-insertString: atIndex:   NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];   [String1 insertString:@"Hi! " atIndex:0];   NSLog(@"String1:%@",String1);               /*--------将已有的空符串换成其它的字符串------*/       //-setString:   NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];   [String1 setString:@"Hello Word!"];   NSLog(@"String1:%@",String1);               /*--------按照所给出的范围，和字符串替换的原有的字符------*/       //-setString:   NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];   [String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];   NSLog(@"String1:%@",String1);               /*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/   //01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;   NSString *String1 = @"NSStringInformation.txt";   [String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");   [String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");       //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;               /*******************************************************************************************   NSArray   *******************************************************************************************/       /*---------------------------创建数组------------------------------*/   //NSArray *array = [[NSArray alloc] initWithObjects:   @"One",@"Two",@"Three",@"Four",nil];       self.dataArray = array;   [array release];       //- (unsigned) Count;数组所包含对象个数；   NSLog(@"self.dataArray cound:%d",[self.dataArray count]);       //- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;   NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);           /*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/       //arrayWithArray:   //NSArray *array1 = [[NSArray alloc] init];   NSMutableArray *MutableArray = [[NSMutableArray alloc] init];   NSArray *array = [NSArray arrayWithObjects:   @"a",@"b",@"c",nil];   NSLog(@"array:%@",array);   MutableArray = [NSMutableArray arrayWithArray:array];   NSLog(@"MutableArray:%@",MutableArray);       array1 = [NSArray arrayWithArray:array];   NSLog(@"array1:%@",array1);           //Copy       //id obj;   NSMutableArray *newArray = [[NSMutableArray alloc] init];   NSArray *oldArray = [NSArray arrayWithObjects:   @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];       NSLog(@"oldArray:%@",oldArray);   for(int i = 0; i < [oldArray count]; i++)   {   obj = [[oldArray objectAtIndex:i] copy];   [newArray addObject: obj];   }   //   NSLog(@"newArray:%@", newArray);   [newArray release];           //快速枚举       //NSMutableArray *newArray = [[NSMutableArray alloc] init];   NSArray *oldArray = [NSArray arrayWithObjects:   @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];   NSLog(@"oldArray:%@",oldArray);       for(id obj in oldArray)   {   [newArray addObject: obj];   }   //   NSLog(@"newArray:%@", newArray);   [newArray release];           //Deep copy       //NSMutableArray *newArray = [[NSMutableArray alloc] init];   NSArray *oldArray = [NSArray arrayWithObjects:   @"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];   NSLog(@"oldArray:%@",oldArray);   newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);   NSLog(@"newArray:%@", newArray);   [newArray release];           //Copy and sort       //NSMutableArray *newArray = [[NSMutableArray alloc] init];   NSArray *oldArray = [NSArray arrayWithObjects:   @"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];   NSLog(@"oldArray:%@",oldArray);   NSEnumerator *enumerator;   enumerator = [oldArray objectEnumerator];   id obj;   while(obj = [enumerator nextObject])   {   [newArray addObject: obj];   }   [newArray sortUsingSelector:@selector(compare:)];   NSLog(@"newArray:%@", newArray);   [newArray release];               /*---------------------------切分数组------------------------------*/       //从字符串分割到数组－ componentsSeparatedByString:   NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];   NSLog(@"string:%@",string);   NSArray *array = [string componentsSeparatedByString:@","];   NSLog(@"array:%@",array);   [string release];           //从数组合并元素到字符串- componentsJoinedByString:   NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];   NSString *string = [array componentsJoinedByString:@","];   NSLog(@"string:%@",string);               /*******************************************************************************************   NSMutableArray   *******************************************************************************************/   /*---------------给数组分配容量----------------*/   //NSArray *array;   array = [NSMutableArray arrayWithCapacity:20];               /*--------------在数组末尾添加对象----------------*/   //- (void) addObject: (id) anObject;   //NSMutableArray *array = [NSMutableArray arrayWithObjects:   @"One",@"Two",@"Three",nil];   [array addObject:@"Four"];   NSLog(@"array:%@",array);               /*--------------删除数组中指定索引处对象----------------*/   //-(void) removeObjectAtIndex: (unsigned) index;   //NSMutableArray *array = [NSMutableArray arrayWithObjects:   @"One",@"Two",@"Three",nil];   [array removeObjectAtIndex:1];   NSLog(@"array:%@",array);               /*-------------数组枚举---------------*/   //- (NSEnumerator *)objectEnumerator;从前向后   //NSMutableArray *array = [NSMutableArray arrayWithObjects:   @"One",@"Two",@"Three",nil];   NSEnumerator *enumerator;   enumerator = [array objectEnumerator];       id thingie;   while (thingie = [enumerator nextObject]) {   NSLog(@"thingie:%@",thingie);   }           //- (NSEnumerator *)reverseObjectEnumerator;从后向前   //NSMutableArray *array = [NSMutableArray arrayWithObjects:   @"One",@"Two",@"Three",nil];   NSEnumerator *enumerator;   enumerator = [array reverseObjectEnumerator];       id object;   while (object = [enumerator nextObject]) {   NSLog(@"object:%@",object);   }           //快速枚举   //NSMutableArray *array = [NSMutableArray arrayWithObjects:   @"One",@"Two",@"Three",nil];   for(NSString *string in array)   {   NSLog(@"string:%@",string);   }               /*******************************************************************************************   NSDictionary   *******************************************************************************************/       /*------------------------------------创建字典------------------------------------*/   //- (id) initWithObjectsAndKeys;       //NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];   NSString *string = [dictionary objectForKey:@"One"];   NSLog(@"string:%@",string);   NSLog(@"dictionary:%@",dictionary);   [dictionary release];           /*******************************************************************************************   NSMutableDictionary   *******************************************************************************************/       /*------------------------------------创建可变字典------------------------------------*/   //创建   NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];       //添加字典   [dictionary setObject:@"One" forKey:@"1"];   [dictionary setObject:@"Two" forKey:@"2"];   [dictionary setObject:@"Three" forKey:@"3"];   [dictionary setObject:@"Four" forKey:@"4"];   NSLog(@"dictionary:%@",dictionary);       //删除指定的字典   [dictionary removeObjectForKey:@"3"];   NSLog(@"dictionary:%@",dictionary);           /*******************************************************************************************   NSValue（对任何对象进行包装）   *******************************************************************************************/       /*--------------------------------将NSRect放入NSArray中------------------------------------*/   //将NSRect放入NSArray中   NSMutableArray *array = [[NSMutableArray alloc] init];   NSValue *value;   CGRect rect = CGRectMake(0, 0, 320, 480);   value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];   [array addObject:value];   NSLog(@"array:%@",array);       //从Array中提取   value = [array objectAtIndex:0];   [value getValue:&rect];   NSLog(@"value:%@",value);           /*******************************************************************************************   从目录搜索扩展名为jpg的文件   *******************************************************************************************/       //NSFileManager *fileManager = [NSFileManager defaultManager];   NSString *home;   home = @"../Users/";       NSDirectoryEnumerator *direnum;   direnum = [fileManager enumeratorAtPath: home];       NSMutableArray *files = [[NSMutableArray alloc] init];       //枚举   NSString *filename;   while (filename = [direnum nextObject]) {   if([[filename pathExtension] hasSuffix:@"jpg"]){   [files addObject:filename];   }   }       //快速枚举   //for(NSString *filename in direnum)   //{   // if([[filename pathExtension] isEqualToString:@"jpg"]){   // [files addObject:filename];   // }   //}   NSLog(@"files:%@",files);       //枚举   NSEnumerator *filenum;   filenum = [files objectEnumerator];   while (filename = [filenum nextObject]) {   NSLog(@"filename:%@",filename);   }       //快速枚举   //for(id object in files)   //{   // NSLog(@"object:%@",object);   //}