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

文章来自：http://blog.sina.com.cn/s/blog_4adf31ea0100nlnp.html