NSDictionary读取数据 [英] NSDictionary read data

问题描述

我现在试着让它工作几个小时，但是无法正常工作。

I have now tried to get this to work for a few hours but just cannot get it right.

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循环只是尝试提取数据的测试的一部分来自字典，是我测试的许多不同方式之一。

The for loops is just part of the tests i do to try to extract data from the dictionary and is one of many different ways i have tested.

我的问题是，是否有人可以告诉我如何提取记录（键+对象） ）和NSLog吗？

My question is if there is someone nice who can show me how to extract a record (key + objects) and NSLog it?

干杯

推荐答案

如果你正在尝试为了保存一些玩家的游戏状态，你可能会采取错误的方式。我不想阻碍你目前的进展，但我想指出一些改进途径。

If you are trying to save the game state for a number of players, you may be going about it the wrong way. I don't want to stand in the way of your current progress, but I would like to point out some avenues for improvement.

第一点： NSDictionary 对象（以及plists，就此而言）可以将数据存储在树结构中，因此不需要为每个用户提供不同的密钥集： / p>

First point: NSDictionary objects (and plists, for that matter) can store data in a tree structure, so there is no need to have a different set of keys for each user:

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

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

    ..., nil];

第二点：更进一步，我想你到底是什么想要是每个玩家的另一个完整的字典：

Second point: Taking this one step further, I think what you really want is another complete dictionary for each player:

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 allPlayers 字典，你可以按如下方式访问单个记录：

Now, after saving and reading the allPlayers dictionary, you would access a single record as follows:

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：如果您要为多个用户存储游戏状态，正确的方式可以它（从OO的角度来看）是创建一个 Player 类，然后加载并保存这个类的实例。一目了然，它看起来像这样：

Third point: If you are storing a game state for several users, the proper way to do it (from an OO point of view) is to create a Player class and then load and save instances of this class. At a glance, it would look like this:

@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，您可以加载和保存玩家如下：

Now, you can load and save players as follows:

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"]];
...

参见：

Objective-C中的嵌套数组（NSMutableArray）（播放器对象）

存储和检索多维NSMutableArrays的最佳方法是什么？（属性列表序列化）

Nested arrays in Objective-C ( NSMutableArray ) (player objects)
What's the best way to store and retrieve multi-dimensional NSMutableArrays? (property list serialization)

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