NSDictionary读取数据

我现在已经尝试让它工作几个小时，但就是无法成功。

我有以下代码：

NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:  

[NSArray arrayWithObjects:@"currentGame1", @"currentGameType1", @"currentGameQuestion1", @"currentGameRightAnswers1", @"currentGameType1", @"numberOfType0Games1", @"type0Results1", @"numberOfType1Games1", @"type1Results1",@"numberOfType2Games1", @"type2Results1",nil], @"Player1",  

[NSArray arrayWithObjects:@"currentGame2", @"currentGameType2", @"currentGameQuestion2", @"currentGameRightAnswers2", @"currentGameType2", @"numberOfType0Games2", @"type0Results2", @"numberOfType1Games2", @"type1Results2",@"numberOfType2Games2", @"type2Results2",nil], @"Player2",  

[NSArray arrayWithObjects:@"currentGame3", @"currentGameType3", @"currentGameQuestion3", @"currentGameRightAnswers3", @"currentGameType3", @"numberOfType0Games3", @"type0Results3", @"numberOfType1Games3", @"type1Results3",@"numberOfType2Games3", @"type2Results3",nil], @"Player3",nil];  
[dict writeToFile:@"/Users/MikaelB/Desktop/xxxxPlayer.plist" atomically: TRUE];  

NSMutableDictionary *readDict = [[NSMutableDictionary alloc] initWithContentsOfFile:@"/Users/MikaelB/Desktop/xxxxPlayer.plist"];  

NSLog(@"readDict: %@", readDict);  
NSLog(@"= = = = = = = = = = = = = = = = = = =");

for (NSArray *key in [readDict allKeysForObject:@"Player6"]) {  
    NSLog(@"Key: %@", key);  
}  

for 循环只是我尝试从字典中提取数据所做的测试的一部分，也是我测试过的许多不同方法之一。

我的问题是是否有好人可以向我展示如何提取记录（键+对象）并对其进行 NSLog？

Cheers

如果您尝试为多个玩家保存游戏状态，那么您的做法可能是错误的。我不想阻碍您当前的进步，但我想指出一些改进的途径。

第一点: NSDictionary对象（以及 plist）可以在树结构中存储数据，因此不需要为每个用户拥有一组不同的键：

NSDictionary* dict = [NSDictionary dictionaryWithObjectsAndKeys:
    [NSArray arrayWithObjects:@"currentGame", @"currentGameType", ..., nil],
    @"player1",

    [NSArray arrayWithObjects:@"currentGame", @"currentGameType", ..., nil],
    @"player2",

    ..., nil];

第二点：更进一步，我认为你真正想要的是另一个完整的字典对于每个玩家：

NSMutableDictionary * playerInfo;
playerInfo = [NSMutableDictionary dictionaryWithCapcity:0];

[playerInfo setObject:@"1" forKey:@"currentGame"];
[playerInfo setObject:@"2" forKey:@"currentGameType"];
[playerInfo setObject:@"what's up?" forKey:@"currentGameQuestion"];
...

NSMutableDictionary * allPlayers;
allPlayers = [NSMutableDictionary dictionaryWithCapcity:0];

NSInteger playerNum;
for (playerNum = 1; playerNum <= 6; playerNum++) {
    NSString * key = [NSString stringWithFormat:@"Player%d", playerNum];
    [allPlayers setObject:playerInfo forKey:key];
}

现在，保存并阅读后allPlayers字典中，您将按如下方式访问单个记录：

NSDictionary * player2Info = [readDict objectForKey:@"player2"];
NSLog(@"%@", player2Info); // show all keys and values for player 2
NSLog(@"%@", [player2Info valueForKey:@"currentGame"]; // show a single value

第三点：如果您要存储多个用户的游戏状态，proper做到这一点的方法（从面向对象的角度来看）是创建一个Player类，然后加载并保存该类的实例。乍一看，它看起来像这样：

@interface Player {
    NSString * currentGame;
    NSString * currentGameType;
    NSString * currentGameQuestion;
    ...
}
@property (nonatomic, copy) NSString * currentGame;
@property (nonatomic, copy) NSString * currentGameType;
@property (nonatomic, copy) NSString * currentGameQuestion;
...
- (void)loadFromDictionary:(NSDictionary *)dict;
- (NSDictionary *)saveAsDictionary;
@end

@implementation Player
@synthesize currentGame;
@synthesize currentGameType;
@synthesize currentGameQuestion;
...

- (void)loadFromDictionary:(NSDictionary *)dict {
    [self setCurrentGame:[dict objectForKey:@"currentGame"]];
    [self setCurrentGameType:[dict objectForKey:@"currentGameType"]];
    [self setCurrentGameQuestion:[dict objectForKey:@"currentGameQuestion"]];
    ...
}

- (NSDictionary *)saveAsDictionary {
    return [NSDictionary dictionaryWithObjectsAndKeys:
        currentGame, @"currentGame";
        currentGameType, @"currentGameType";
        currentGameQuestion, @"currentGameQuestion";
        ...
    nil];
}

@end

现在，您可以按如下方式加载和保存玩家：

Player * player1 = [[[Player alloc] init] autorelease];
Player * player2 = [[[Player alloc] init] autorelease];
...

NSDictionary * players = [NSDictionary dictionaryWithObjectsAndKeys:
    [player1 saveAsDictionary], @"Player1",
    [player2 saveAsDictionary], @"Player2",
    ...
    nil];

// save dictionary
[players writeToFile:...

// load dictionary
NSDictionary * readDict = ...

[player1 loadFromDictionary:[readDict objectForKey:@"Player1"]];
[player2 loadFromDictionary:[readDict objectForKey:@"Player2"]];
...

See also:

Objective-C 中的嵌套数组 ( NSMutableArray ) https://stackoverflow.com/q/1244833/33686（玩家对象）
存储和检索多维 NSMutableArray 的最佳方法是什么？ https://stackoverflow.com/q/2136905/33686（属性列表序列化）