(转)Iphone数组一些基础操作 NSArray/NSMutableArray

/*******************************************************************************************

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);
   //}

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(转)Iphone数组一些基础操作 NSArray/NSMutableArray

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