最近在搞点iphone上的开发，在豆瓣上看到有个数组使用的总结，就转过来做个笔记，感谢作者的辛苦总结，中间的一些技巧还是很实用的，希望对你有帮助。 http://www.douban.com/note/76633487/

NSArray

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