OC语言--数组&字典

-》方式一：

NSArray *array = [[NSArray alloc] initWithObjects:@"one", @"two", @"three", @"one", nil];

//nil 作为OC数组声明的结束符，不在 OC 数组元素中；

 

-》方式二：//采用类方法来创建 OC 数组对象

NSArray *array2 = [NSArray arrayWithObjects:@"one", @"two", @"four", nil];

 

-》方式三（Objective-c 2.0新特性支持）： Xcode4.6以后的版本支持

NSArray *array3 = @[@"One One", @"Two", @"Three", @"Four"];

1 常见创建方法
- (id)initWithObjects:(id)firstObj, ...;

- (id)initWithArray:(NSArray *)array;

+ (id)arrayWithObjects:(id)firstObj, ...;

+ (id)arrayWithArray:(NSArray *)array;

 

2 获取数组元素个数

- (NSUInteger)count;

 

3 通过索引，获取相应的元素

- (id)objectAtIndex:(NSUInteger)index;

 

4 通过对象地址，获取在数组中的索引

- (NSUInteger)indexOfObject:(id)anObject;

 

5 判断数组中，数组包含元素anObject

- (BOOL)containsObject:(id)anObject;

 

6 获取数组的最后一个元素

- (id)lastObject;

 

7 把数组元素内容，按照字符串separator进行拼接

- (NSString *)componentsJoinedByString:

(NSString *)separator;

               1 增加数组元素
		-》追加元素
			- (void)addObject:(id)anObject;

		-》指定索引插入元素
			- (void)insertObject:(id)anObject atIndex:
			(NSUInteger)index;
		-》追加一个数组
			- (void)addObjectsFromArray:(NSArray *)otherArray;

		2 删除
		-》删除最后一个元素
			- (void)removeLastObject;

		-》删除指定索引的一个元素
			- (void)removeObjectAtIndex:(NSUInteger)index;

		-》删除所有元素
			- (void)removeAllObjects;

		-》删除指定范围内所有的某个元素
			- (void)removeObject:(id)anObject 
			inRange:(NSRange)range;

		-》删除指定的一个元素
			- (void)removeObject:(id)anObject;

		-》删除由一个数组所给定的所有元素
			//给定的数组 otherArray中的元素，是要被删除的所有元素
			- (void)removeObjectsInArray:(NSArray *)otherArray;

		3 修改数组//用一个数组覆盖另一个数组
	     		- (void)setArray:(NSArray *)otherArray;

		

		4 替换指定索引的元素
	  		- (void)replaceObjectAtIndex:(NSUInteger)index 
			withObject:(id)anObject;

		5 交换数组元素
	  		- (void)exchangeObjectAtIndex:(NSUInteger)idx1 
			withObjectAtIndex:(NSUInteger)idx2;

		6 排序:根据排序准则排序
		//利用选择器来排序；选择器是函数指针对象，SEL 是函数指针对象的类型
	  		- (void)sortUsingSelector:(SEL)comparator;

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

  @autoreleasepool {
      
    NSArray* aArray = [[NSArray alloc]initWithObjects:@"ni",@"wo",@"ta", nil];
    
    for (NSUInteger i = 0; i < [aArray count]; i++) {
      NSLog(@"%@",[aArray objectAtIndex:i]);
    }
      //mutable版本的数组遍历
    NSMutableArray* muaArray = [[NSMutableArray alloc]initWithObjects:@"ni",@"wo",@"ta", nil];
    
    for (NSUInteger i = 0; i < [aArray count]; i++) {
      NSLog(@"%@",[muaArray objectAtIndex:i]);
    }
      //添加一个数组元素
    [muaArray addObject:@"nimen"];
      //检测数组中是否包含特定元素
      //判断数组中，数组包含元素anObject
      //- (BOOL)containsObject:(id)anObject;
    if ([muaArray containsObject:@"nimen"]) {
      NSLog(@"数组包含该元素");
    }else{
      NSLog(@"没找到该对象元素");
    }
    [muaArray removeLastObject];
      [muaArray removeObjectAtIndex:0];
      //[muaArray removeObject:@"wo"];
    for (NSUInteger i = 0; i < [muaArray count]; i++) {
      NSLog(@"%@",[muaArray objectAtIndex:i]);
    }
    
    
  }
    return 0;
}

                1 创建方法
		-》实例化方法
	  		- (id)initWithObjectsAndKeys:(id)firstObject, ...;

	  		- (id)initWithDictionary:
					(NSDictionary *)otherDictionary;

	  		- (id)initWithObjects:(NSArray *)objects 
			forKeys:(NSArray *)keys;

		-》类方法创建
	  		+ (id)dictionaryWithObjectsAndKeys: 
			(id)firstObject, ...;

	  		+ (id)dictionaryWithDictionary:(NSDictionary *)dict;

	  		+ (id)dictionaryWithObjects:(NSArray *)objects 
			forKeys:(NSArray *)keys;

		2 获取键值对的个数
	  		- (NSUInteger)count;

		3 根据key 获取相应的值
	  		- (id)objectForKey:(id)aKey;

		4 获取字典中所有的key
	  		- (NSArray *)allKeys;

		5 获取值是anObject的所有的key
	  		- (NSArray *)allKeysForObject:(id)anObject;    

		6 获取字典中所有的值
	  		- (NSArray *)allValues;

              1 增加
		-》增加整个字典
	  		- (void)addEntriesFromDictionary:
			(NSDictionary *)otherDictionary;

		-》增加键值对
			// key不存在则增加， key存在则修改key对应的值
	  		- (void)setObject:(id)anObject 
			forKey:(id <NSCopying>)aKey;

		2 删除
		-》根据key，删除键值对
	  		- (void)removeObjectForKey:(id)aKey;

		-》删除所有键值对
	  		- (void)removeAllObjects;

		-》根据数组中的内容，删除相应的键值对
	  		- (void)removeObjectsForKeys:(NSArray *)keyArray;

		3 修改
		-》修改整个字典
	  		- (void)setDictionary:(NSDictionary *)otherDictionary;

		-》修改键值对
			// key不存在则增加， key存在则修改key对应的值
	  		- (void)setObject:(id)anObject 
			forKey:(id <NSCopying>)aKey;

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

  @autoreleasepool {
    NSDictionary* oneDic = [[NSDictionary alloc]initWithObjectsAndKeys:@"BeiJing",@"One",@"Shanghai",@"Two",@"GuangZhou",@"Three", nil];
    NSLog(@"%@",oneDic);
      //create mutable Dictionary
    NSMutableDictionary* twoDic = [[NSMutableDictionary alloc]initWithObjectsAndKeys:@"BeiJing",@"One",@"Shanghai",@"Two",@"GuangZhou",@"Three",nil];
     NSLog(@"%@",twoDic);
      //add a Key-Value couple
    [twoDic setObject:@"ShenZheng" forKey:@"Four"];
    NSLog(@"%@",twoDic);
    
      //NSArray* keyArray = [NSArray arrayWithObjects:@"Two",@"Four", nil];
    
      //[twoDic removeObjectsForKeys:keyArray];
    NSLog(@"%@",twoDic);
      //create threeDic by twoDic Value
    NSMutableDictionary* threeDic = [NSMutableDictionary dictionary];
    
    NSArray* valueArray = [twoDic allValues];
    for (int i = 0; i < [valueArray count]; i++) {
      NSString* city = [NSString stringWithFormat:@"%@" ,[valueArray objectAtIndex:i]];
        [threeDic setObject:city forKey:[valueArray objectAtIndex:i]];
    }
    
    for ( NSString* key in threeDic){
      NSLog(@"Key:%@,Value:%@",key,[threeDic objectForKey:key]);
    }
    
  }
    return 0;
}