OC -- NSMutableDictionary

/*___________________________可变数组NSMutableDictionary__________________________________*/

//1.创建
NSMutableDictionary *dic = [[NSMutableDictionary alloc]init];
NSMutableDictionary *dic1 = [NSMutableDictionary dictionary];
NSMutableDictionary *dic2 = [[NSMutableDictionary alloc]initWithCapacity:5];
NSMutableDictionary *dic3 = [NSMutableDictiona dictionaryWithCapacity:5];

//2.方法
NSArray *array = @[@"arr1",@"arr2"];
//1.增&改：添加[键值对]

/*
  1) 判断字典中是否有该键，如果没有则添加新的键值对
                                        如果有则替换键原来所对应的对象
*/

[dic setObject:array forKey:@"0"];
[dic setObject:array forKey:@"1"];
[dic setObject:array forKey:@"2"];
[dic setObject:array forKey:@"3"];

NSLog(@"%@",dic);


//2.删：移除 [键值对]
  //移除全部
[dic removeAllObjects];

  //移除一个
[dic removeObjectsForKeys:@[@"1",@"2"]];

//移除多个
[dic removeObjectsForKeys:@[@"1",@"2"]];

NSLog(@"%@",dic)