IOS开发NSArray,NSSet,NSDictionary,NSString操作总结

三种集合类来收集cocoa对象（NSObject对象）：
NSArray用于对象有序集合（相当于是数组）
NSSet用于对象无序集合
NSDictionary用于键值映射
以上三种集合类是不可变的（一旦初始化后，就不能改变）

以下是对应的三种可变集合类(这三种可变集合类是对应上面三种集合类的子类)：
NSMutableArray
NSMutableSet
NSMutableDictionary

注：这些集合类只能收集cocoa对象（NSOjbect对象），如果想保存一些原始的C数据（例如，int, float, double, BOOL等），则需要将这些原始的C数据封装成NSNumber类型的，NSNumber对象是cocoa对象，可以被保存在集合类中。

NSArray
Ordered collection of objects.Immutable. You cannot add or remove objects to it once it’s created.
Important methods:
+ (id)arrayWithObjects:(id)firstObject, ...; //nilterminated
- (int)count;
- (id)objectAtIndex:(int)index; // NSString *s1=[[myarray objectAtIndex: 0];
- (void)makeObjectsPerformSelector:(SEL)aSelector;
- (NSArray *)sortedArrayUsingSelector:(SEL)aSelector;
- (id)lastObject; // returns nil if there are no objects in the array (convenient)
注：
类方法arrayWithObjects可以创建anautoreleasedNSArray of the items.例如
@implementation MyObject
- (NSArray *)coolCats{
return [NSArray arrayWithObjects:@“Steve”, @“Ankush”, @“Sean”, nil];
}
@end
Other convenient create with methods (all return autoreleased objects):
[NSString stringWithFormat:@“Meaning of %@ is %d”, @“life”, 42];
[NSDictionary dictionaryWithObjectsAndKeys:ankush, @“TA”, janestudent, @“Student”, nil];
[NSArray arrayWithContentsOfFile:(NSString *)path];
-----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:

NSMutableArray
Mutable version of NSArray.
- (void)addObject:(id)anObject;
- (void)insertObject:(id)anObject atIndex:(int)index;
- (void)removeObjectAtIndex:(int)index;
- (void)removeAllObjects;

-----给数组分配容量-----
//NSArray *array;
array = [NSMutableArrayarrayWithCapacity:20];

-----在数组末尾添加对象-----
//- (void) addObject: (id) anObject;
//NSMutableArray *array = [NSMutableArrayarrayWithObjects:@"One",@"Two",@"Three",nil];
[arrayaddObject:@"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];
[arrayremoveObjectAtIndex:1];
NSLog(@"array:%@",array);

-----数组枚举-----
//1、- (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);
}
//2、- (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);
}
//3、快速枚举
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSString *string in array)
{
NSLog(@"string:%@",string);
}

-----NSValue（对任何对象进行包装）-----
//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);

----★使用NSMutableArray要防止内存泄露★------
NSObject* p1 = [[NSObject alloc] init];
NSObject* p2 = [[NSObject alloc] init];
NSMutableArray* objectsArray = [[NSMutableArray alloc] init];

[objectsArray addObject:p1];
NSLog(@"p1 count:%d", [p1 retainCount]);//输出 2，也就是执行追加对象后，对象的计数器也被加1
//[p1 release];
//NSLog(@"p1 count:%d", [p1 retainCount]);

//同样做数组替换时
[objectsArray replaceObjectAtIndex:0 withObject:p2];
NSLog(@"p2 count:%d", [p2 retainCount]);//输出 2，同样也是2
NSLog(@"p1 count:%d", [p1 retainCount]);//输出 1，对象p1仍然存在
//[p2 release];
//NSLog(@"p2 count:%d", [p2 retainCount]);

//执行清空数组
[objectsArray removeAllObjects];
NSLog(@"p2 count:%d", [p2 retainCount]);//输出 1，对象p2仍然存在
//[p2 release];

由此可知，每次执行上面的数组操作后，要执行对象release，如上面注释中的语句，才能保证内存不泄露。

NSSet
Unordered collection of objects.
Immutable. You cannot add or remove objects to it once it’s created.
Important methods:
+ setWithObjects:(id)firstObj, ...; //nilterminated

- (int)count;
- (BOOL)containsObject:(id)anObject;
- (id)anyObject;
- (void)makeObjectsPerformSelector:(SEL)aSelector;
- (id)member:(id)anObject; // uses isEqual: and returns a matching object (if any)

NSMutableSet
Mutable version of NSSet.
+ (NSMutableSet *)set;

- (void)addObject:(id)anObject;
- (void)removeObject:(id)anObject;

- (void)removeAllObjects;
- (void)unionSet:(NSSet *)otherSet;
- (void)minusSet:(NSSet *)otherSet;
- (void)intersectSet:(NSSet *)otherSet;

NSDictionary
key-value, key-value, ..... 一系列键值对。

key（键）在整个dictionary是唯一的，通过key可以查询其对应的一个或多个value（值）。

Hash table. Look up objects using a key to get a value.
Immutable. You cannot add or remove objects to it once it’s created.
Keys are objects which must implement. Keys are usually NSString objects.
- (NSUInteger)hash & - (BOOL)isEqual:(NSObject *)obj
Important methods:
+ dictionaryWithObjectsAndKeys: (id)firstObject, ...;

- (int)count;
- (id)objectForKey:(id)key;
- (NSArray *)allKeys;
- (NSArray *)allValues;

-----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
Mutable version of NSDictionary.
+ (NSMutableDictionary *)dictionary;

- (void)setObject:(id)anObject forKey:(id)key;
- (void)removeObjectForKey:(id)key;

- (void)removeAllObjects;
- (void)addEntriesFromDictionary:(NSDictionary *)otherDictionary;

-----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);

以下内容由angellixf整理,这里制作记录:

/*******************************************************************************************
NSString
*******************************************************************************************/
//一、NSString
/*----------------创建字符串的方法----------------*/

//1、创建常量字符串。
NSString*astring=@"ThisisaString!";


//2、创建空字符串，给予赋值。

NSString*astring=[[NSStringalloc]init];
astring=@"ThisisaString!";
[astringrelease];
NSLog(@"astring:%@",astring);



//3、在以上方法中，提升速度:initWithString方法

NSString*astring=[[NSStringalloc]initWithString:@"ThisisaString!"];
NSLog(@"astring:%@",astring);
[astringrelease];



//4、用标准c创建字符串:initWithCString方法

char*Cstring="ThisisaString!";
NSString*astring=[[NSStringalloc]initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astringrelease];



//5、创建格式化字符串:占位符（由一个%加一个字符组成）

inti=1;
intj=2;
NSString*astring=[[NSStringalloc]initWithString:[NSStringstringWithFormat:@"%d.Thisis%istring!",i,j]];
NSLog(@"astring:%@",astring);
[astringrelease];



//6、创建临时字符串

NSString*astring;
astring=[NSStringstringWithCString:"Thisisatemporarystring"];
NSLog(@"astring:%@",astring);




/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/

NSString*path=@"astring.text";
NSString*astring=[[NSStringalloc]initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astringrelease];


/*----------------写字符串到文件:writeToFile方法----------------*/


NSString*astring=[[NSStringalloc]initWithString:@"ThisisaString!"];
NSLog(@"astring:%@",astring);
NSString*path=@"astring.text";
[astringwriteToFile:pathatomically:YES];
[astringrelease];




/*----------------比较两个字符串----------------*/

//用C比较:strcmp函数

charstring1[]="string!";
charstring2[]="string!";
if(strcmp(string1,string2)==0)
{
NSLog(@"1");
}



//isEqualToString方法
NSString*astring01=@"ThisisaString!";
NSString*astring02=@"ThisisaString!";
BOOLresult=[astring01isEqualToString:astring02];
NSLog(@"result:%d",result);




//compare方法(comparer返回的三种值)
NSString*astring01=@"ThisisaString!";
NSString*astring02=@"ThisisaString!";
BOOLresult=[astring01compare:astring02]==NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame判断两者内容是否相同




NSString*astring01=@"ThisisaString!";
NSString*astring02=@"thisisaString!";
BOOLresult=[astring01compare: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=@"thisisaString!";
NSString*astring02=@"ThisisaString!";
BOOLresult=[astring01compare: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=@"thisisaString!";
NSString*astring02=@"ThisisaString!";
BOOLresult=[astring01caseInsensitiveCompare: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=@"thisisaString!";
NSString*astring02=@"ThisisaString!";
BOOLresult=[astring01compare: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=@"AString";
NSString*string2=@"String";
NSLog(@"string1:%@",[string1uppercaseString]);//大写
NSLog(@"string2:%@",[string2lowercaseString]);//小写
NSLog(@"string2:%@",[string2capitalizedString]);//首字母大小


/*----------------在串中搜索子串----------------*/

NSString*string1=@"Thisisastring";
NSString*string2=@"string";
NSRangerange=[string1rangeOfString:string2];
intlocation=range.location;
intleight=range.length;
NSString*astring=[[NSStringalloc]initWithString:[NSStringstringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astringrelease];


/*----------------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=@"Thisisastring";
NSString*string2=[string1substringToIndex: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=@"Thisisastring";
NSString*string2=[string1substringFromIndex: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=@"Thisisastring";
NSString*string2=[string1substringWithRange:NSMakeRange(0,4)];
NSLog(@"string2:%@",string2);


//扩展路径

NSString*Path=@"~/NSData.txt";
NSString*absolutePath=[PathstringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePathstringByAbbreviatingWithTildeInPath]);



//文件扩展名
NSString*Path=@"~/NSData.txt";
NSLog(@"Extension:%@",[PathpathExtension]);




/*******************************************************************************************
NSMutableString
*******************************************************************************************/

/*---------------给字符串分配容量----------------*/
//stringWithCapacity:
NSMutableString*String;
String=[NSMutableStringstringWithCapacity:40];


/*---------------在已有字符串后面添加字符----------------*/

//appendString:andappendFormat:

NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
//[String1appendString:@",Iwillbeaddingsomecharacter"];
[String1appendFormat:[NSStringstringWithFormat:@",Iwillbeaddingsomecharacter"]];
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=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
[String1deleteCharactersInRange: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=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
[String1insertString:@"Hi!"atIndex:0];
NSLog(@"String1:%@",String1);



/*--------将已有的空符串换成其它的字符串------*/

//-setString:
NSMutableString*String1=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
[String1setString:@"HelloWord!"];
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=[[NSMutableStringalloc]initWithString:@"ThisisaNSMutableString"];
[String1replaceCharactersInRange: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";
[String1hasPrefix:@"NSString"]==1?NSLog(@"YES"):NSLog(@"NO");
[String1hasSuffix:@".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=[[NSArrayalloc]initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];

self.dataArray=array;
[arrayrelease];

//-(unsigned)Count;数组所包含对象个数；
NSLog(@"self.dataArraycound:%d",[self.dataArraycount]);

//-(id)objectAtIndex:(unsignedint)index;获取指定索引处的对象;
NSLog(@"self.dataArraycound2:%@",[self.dataArrayobjectAtIndex:2]);


/*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/

//arrayWithArray:
//NSArray*array1=[[NSArrayalloc]init];
NSMutableArray*MutableArray=[[NSMutableArrayalloc]init];
NSArray*array=[NSArrayarrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray=[NSMutableArrayarrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);

array1=[NSArrayarrayWithArray:array];
NSLog(@"array1:%@",array1);


//Copy

//idobj;
NSMutableArray*newArray=[[NSMutableArrayalloc]init];
NSArray*oldArray=[NSArrayarrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];

NSLog(@"oldArray:%@",oldArray);
for(inti=0;i<[oldArraycount];i++)
{
obj=[[oldArrayobjectAtIndex:i]copy];
[newArrayaddObject:obj];
}
//
NSLog(@"newArray:%@",newArray);
[newArrayrelease];


//快速枚举

//NSMutableArray*newArray=[[NSMutableArrayalloc]init];
NSArray*oldArray=[NSArrayarrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);

for(idobjinoldArray)
{
[newArrayaddObject:obj];
}
//
NSLog(@"newArray:%@",newArray);
[newArrayrelease];


//Deepcopy

//NSMutableArray*newArray=[[NSMutableArrayalloc]init];
NSArray*oldArray=[NSArrayarrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
newArray=(NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault,(CFPropertyListRef)oldArray,kCFPropertyListMutableContainers);
NSLog(@"newArray:%@",newArray);
[newArrayrelease];


//Copyandsort

//NSMutableArray*newArray=[[NSMutableArrayalloc]init];
NSArray*oldArray=[NSArrayarrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator*enumerator;
enumerator=[oldArrayobjectEnumerator];
idobj;
while(obj=[enumeratornextObject])
{
[newArrayaddObject:obj];
}
[newArraysortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@",newArray);
[newArrayrelease];



/*---------------------------切分数组------------------------------*/

//从字符串分割到数组－componentsSeparatedByString:
NSString*string=[[NSStringalloc]initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArray*array=[stringcomponentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[stringrelease];


//从数组合并元素到字符串-componentsJoinedByString:
NSArray*array=[[NSArrayalloc]initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString*string=[arraycomponentsJoinedByString:@","];
NSLog(@"string:%@",string);



/*******************************************************************************************
NSMutableArray
*******************************************************************************************/
/*---------------给数组分配容量----------------*/
//NSArray*array;
array=[NSMutableArrayarrayWithCapacity:20];



/*--------------在数组末尾添加对象----------------*/
//-(void)addObject:(id)anObject;
//NSMutableArray*array=[NSMutableArrayarrayWithObjects:
@"One",@"Two",@"Three",nil];
[arrayaddObject:@"Four"];
NSLog(@"array:%@",array);



/*--------------删除数组中指定索引处对象----------------*/
//-(void)removeObjectAtIndex:(unsigned)index;
//NSMutableArray*array=[NSMutableArrayarrayWithObjects:
@"One",@"Two",@"Three",nil];
[arrayremoveObjectAtIndex:1];
NSLog(@"array:%@",array);



/*-------------数组枚举---------------*/
//-(NSEnumerator*)objectEnumerator;从前向后
//NSMutableArray*array=[NSMutableArrayarrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator*enumerator;
enumerator=[arrayobjectEnumerator];

idthingie;
while(thingie=[enumeratornextObject]){
NSLog(@"thingie:%@",thingie);
}


//-(NSEnumerator*)reverseObjectEnumerator;从后向前
//NSMutableArray*array=[NSMutableArrayarrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator*enumerator;
enumerator=[arrayreverseObjectEnumerator];

idobject;
while(object=[enumeratornextObject]){
NSLog(@"object:%@",object);
}


//快速枚举
//NSMutableArray*array=[NSMutableArrayarrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSString*stringinarray)
{
NSLog(@"string:%@",string);
}



/*******************************************************************************************
NSDictionary
*******************************************************************************************/

/*------------------------------------创建字典------------------------------------*/
//-(id)initWithObjectsAndKeys;

//NSDictionary*dictionary=[[NSDictionaryalloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSString*string=[dictionaryobjectForKey:@"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
[dictionaryrelease];


/*******************************************************************************************
NSMutableDictionary
*******************************************************************************************/

/*------------------------------------创建可变字典------------------------------------*/
//创建
NSMutableDictionary*dictionary=[NSMutableDictionarydictionary];

//添加字典
[dictionarysetObject:@"One"forKey:@"1"];
[dictionarysetObject:@"Two"forKey:@"2"];
[dictionarysetObject:@"Three"forKey:@"3"];
[dictionarysetObject:@"Four"forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);

//删除指定的字典
[dictionaryremoveObjectForKey:@"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=[[NSMutableArrayalloc]init];
NSValue*value;
CGRectrect=CGRectMake(0,0,320,480);
value=[NSValuevalueWithBytes:&rectobjCType:@encode(CGRect)];
[arrayaddObject:value];
NSLog(@"array:%@",array);

//从Array中提取
value=[arrayobjectAtIndex:0];
[valuegetValue:&rect];
NSLog(@"value:%@",value);


/*******************************************************************************************
从目录搜索扩展名为jpg的文件
*******************************************************************************************/

//NSFileManager*fileManager=[NSFileManagerdefaultManager];
NSString*home;
home=@"../Users/";

NSDirectoryEnumerator*direnum;
direnum=[fileManagerenumeratorAtPath:home];

NSMutableArray*files=[[NSMutableArrayalloc]init];

//枚举
NSString*filename;
while(filename=[direnumnextObject]){
if([[filenamepathExtension]hasSuffix:@"jpg"]){
[filesaddObject:filename];
}
}

//快速枚举
//for(NSString*filenameindirenum)
//{
//if([[filenamepathExtension]isEqualToString:@"jpg"]){
//[filesaddObject:filename];
//}
//}
NSLog(@"files:%@",files);

//枚举
NSEnumerator*filenum;
filenum=[filesobjectEnumerator];
while(filename=[filenumnextObject]){
NSLog(@"filename:%@",filename);
}

//快速枚举
//for(idobjectinfiles)
//{
//NSLog(@"object:%@",object);
//}