NSArray和NSMutableArray的用法

NSArray是静态的数组,就是它所指向的内容是不可改变的,它指向一段内存区域,一旦初始化,不能通过它对该内存区域的数据进行修改操作,但是它可以读数据。
NSMutableArray是动态的是NSArray的子类,可以对所指向的内存区域内容进行更改,并可以增加数组内容
NSArray和NSmutableArray的第一个数据的下标为0。
********************************************************************************
NSArray 
********************************************************************************

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]);


//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];

//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);

//NSArray *array;
array = [NSMutableArray arrayWithCapacity:20];

//- (void) addObject: (id) anObject;
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
NSLog(@"array:%@",array);

//-(void) removeObjectAtIndex: (unsigned) index; 
NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array removeObjectAtIndex:1];
NSLog(@"array:%@",array);

//- (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);
}

//- (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];

//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);

//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);

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);
}

for(NSString *arrayString1 in readArray1)
{
//NSLog(@"arrayString1=%@",arrayString1);
NSArray *array1=[arrayString1 componentsSeparatedByString:@"#:)"]; 

NSString *name1=[array1 objectAtIndex:0];
NSString *page1=[array1 objectAtIndex:1];

[self.array addObject:[[NSMutableDictionary alloc]initWithObjectsAndKeys:name1,@"name",page1,@"page",nil]];

NSString *fileString3=[NSString stringWithFormat:@"%@#:)%@",
name1,page1];
[self.markName addObject:fileString3];

}



精简版

NSMutableArray的用法 


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


Last modification:January 1st, 1970 at 08:00 am
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