Objective-C：创建 NSMutableDictionary 或 NSMutableArray

Question

对于我的 iPhone 应用，我想管理 NSMutableDictionary 或 NSMutableAarray 中的值。

我想以这种格式存储评分

round   player1  player2
  1        6        8
  2        7        9
--        --        --

在我的情况下，回合数将是固定值假设 10，总玩家将是 2，这也是固定的。

但用户可以按任何随机顺序提交他们的分数，但只需单击一次按钮。意味着

 score for round  "10" for both the player   enter
 score for round  "2"  for both the player   enter

我如何管理字典或数组以帮助我轻松地再次检索它们？

Answer 1

为什么在面向对象的语言中只有数组或字典？

@interface RoundResults : NSObject

@property (nonatomic, assign) NSInteger playerOneScore;
@property (nonatomic, assign) NSInteger playerTwoScore;

@end

@interface GameTotal : NSObject

- (void)setResults: (RoundResults *)results forRound: (NSInteger)round;
- (RoundResults *)resultsForRound: (NSInteger)round;
- (NSUInteger)countOfResults;

@end

Answer 2

//You can use combination of mutable array and dictionary to handle each round and player score

NSMutableArray *mutArrayRound=[[NSMutableArray alloc] initWithCapacity:10];


//--EDIT-------------------------------------------------------------------

//You need to do it somewhere so that it'll not give error for [mutArrayRound insertObject: atIndex:]

mutDic=[[NSMutableDictionary alloc] init];

for(int i=0;i<10;i++)
{
    [mutArrayRound addObject:mutDic];
}

[mutDic release];

//-------------------------------------------------------------------------

NSMutableDictionary *mutDic=[[NSMutableDictionary alloc] initWithCapacity:2];
[mutDic setValue:@"Score_Valaue" forKey:@"player1-Score"];
[mutDic setValue:@"Score_Valaue" forKey:@"player2-Score"];

//For Round1
[mutArrayRound insertObject:mutDic atIndex:0];

//For Round2
[mutArrayRound insertObject:mutDic atIndex:1];


/*
    You can access for particular round using mutDic=[mutArrayRound objectAtIndex:0];
    And to access player score, you can use key score=[mutDic valueForKey:@"Player1_Score"];
 */

[mutArrayRound release];
[mutDic release];

Answer 3

你可以制作NSDictionary的NSMutableArray：

      NSMutableArray *arr = [[NSMutableArray alloc] initWithCapacity:10];
                // Now say Player one got 50 and Player2 got 65 in first round then add them in dictionary


                NSDictionary *dict  = [[NSDictionary alloc] initWithObjectsAndKeys:@"50",@"P1",@"65",@"P2", nil];
                [arr addObject:dict];
[dict release];


            // As soon as you got the sores make a NSDictionary object and init it with objects like above and add that to the mutable array . It will add it to next index.

希望这会有所帮助。

Answer 4

想法 1：

NSMutableDictionary* playerArounds = [NSMutableDictionary dictionary];
NSMutableDictionary* playerBrounds = [NSMutableDictionary dictionary];

[playerArounds setObject:@"5" forKey:@"1"]; 
// Player A scored 5 for round 1

// etc...

想法 2：（适合 >2 名玩家）

NSMutableArray* playerRounds = [NSMutableArray arrayWithObjects:nil];

for (int i=0; i<10; i++)
    [playerRounds addObject:[NSMutableDictionary dictionary]];

[[playerRounds objectAtIndex:0] setObject:@"5" forKey:@"1"];  
// Player 0 scored 5 for round 1

// etc...

想法 3：（更纯 C 的方法）

// a 2-dimensional array
int scores[2][10]; 

scores[0][2] = 5;

// Player 0's score for round 3 (2+1) is 5

---

正如所指出的：

而不是例如[playerArounds setObject:@"5" forKey:@"1"];，因为您的值将是 int（而不是字符串），所以您最好使用（它会更有意义）：

例如[playerArounds setObject:[NSNumber numberWithInt:5] forKey:[NSNumber numberWithInt:1]];