NSStirng、NSArray、以及枚举(Method小集合)

 /*******************************************************************************************     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);    //}

http://www.cnblogs.com/520TT/archive/2011/01/18/1938150.html