NSArray和NSMutableArray的用法

NSArray和NSMutableArray的用法

 (2012-07-12 17:04:39)

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标签：  杂谈

分类： iphone开发

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];
  
 }