Question

我很好奇被认为是管理高分plist文件读写的更好方法。我的高分课程是：

@interface HighScore : NSObject <NSCoding> {
    NSString        *name;
    int             score;
    int             level;
    int             round;
    NSDate          *date;
}

现在，我可以做方法A，添加NSCoding方法：

- (void) encodeWithCoder: (NSCoder *) coder {
    [coder encodeObject: name
                 forKey: kHighScoreNameKey];
    [coder encodeInt: score
              forKey: kHighScoreScoreKey];
    [coder encodeInt: level
              forKey: kHighScoreLevelKey];
    [coder encodeInt: round
              forKey: kHighScoreRoundKey];
    [coder encodeObject: date
                 forKey: kHighScoreDateKey];
} // encodeWithCoder

- (id) initWithCoder: (NSCoder *) decoder {
    if (self = [super init]) {
        self.name = [decoder decodeObjectForKey: kHighScoreNameKey];
        self.score = [decoder decodeIntForKey: kHighScoreScoreKey];
        self.level = [decoder decodeIntForKey: kHighScoreLevelKey];
        self.round = [decoder decodeIntForKey: kHighScoreRoundKey];
        self.date = [decoder decodeObjectForKey: kHighScoreDateKey];
    }
    return (self);
} // initWithCoder

用以下内容写出来：

if (![NSKeyedArchiver archiveRootObject:highScoresList toFile:path]) ...

重读它会很简单。然而，plist文件，恕我直言，看起来像垃圾。

或者我可以使用方法B：

NSMutableArray *array = [NSMutableArray arrayWithCapacity:20];;
for (HighScore *hs in highScoresList) {
    NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:
                          hs.name, kHighScoreNameKey,
                          [NSNumber numberWithInteger:hs.score], kHighScoreScoreKey,
                          [NSNumber numberWithInteger:hs.level], kHighScoreLevelKey,
                          [NSNumber numberWithInteger:hs.round], kHighScoreRoundKey,
                          hs.date, kHighScoreDateKey,
                          nil];
    [array addObject:dict];
    [dict release];
}

并用以下内容写出来：

if (![array writeToFile:path atomically:YES]) ...

重读它有点困难。但plist文件看起来更清晰（更小和更紧凑）。

有什么想法？我错过了一些更简单的东西吗？（我想保持高分与NSUserDefaults分开，所以我没有使用它。）

Answer 1

你的方式对我来说都很好。在3.0操作系统中也有核心数据，但如果您想要保存的只是一个高分值，则可能有点过分。

Answer 2

我不确定我理解你的反对意见！两者都应该正常工作。

我个人更喜欢方法A.我认为对象知道如何编码自己是有意义的。它使维护更容易，任何更改都更加本地化。此外，它可能使用更少的内存。

Answer 3

查看this问题，也许它对您的应用有用

Answer 4

我使用方法B，因为：1。plist文件更具可读性2.我可以轻松地将一些文件和类版本编号保存到此方法中：

在我的HighScore课程中：

- (id)initFromDictionary: (NSDictionary *)dict;
{
    if (self = [super init]) {
        self.name = [dict objectForKey:kHighScoreNameKey];
        self.score = [[dict objectForKey:kHighScoreScoreKey] integerValue];
        self.game = [[dict objectForKey:kHighScoreGameKey] integerValue];
        self.level = [[dict objectForKey:kHighScoreLevelKey] integerValue];
        self.date = [dict objectForKey:kHighScoreDateKey];
    }
    return (self);
}
- (NSDictionary *)putIntoDictionary;
{
    NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:
                          name, kHighScoreNameKey,
                          [NSNumber numberWithInt:score], kHighScoreScoreKey,
                          [NSNumber numberWithInt:game], kHighScoreGameKey,
                          [NSNumber numberWithInt:level], kHighScoreLevelKey,
                          date, kHighScoreDateKey,
                          nil];
    return dict;
}

And in my HighScoreTable class:
- (id) load
{
    NSString *path = [self getFilePath];

//  [self clear];
    NSDictionary *rootLevelPlistDict = [NSDictionary dictionaryWithContentsOfFile:path];
    int versNum = [[rootLevelPlistDict objectForKey:kHighScoreVersKey] integerValue];

    if (versNum == kHighScoreVersNum) {
        NSArray *insideArray = [rootLevelPlistDict objectForKey:kHighScoresKey];

        NSDictionary *dict;
        for (dict in insideArray) {
            HighScore *hs = [[HighScore alloc] initFromDictionary:dict];
            [highScoresList addObject:hs];
            [hs release];
        }
    }
    return sharedHighScoresSingleton;
}


- (void) save
{   
    if (!changed)
        return;
    NSString *path = [self getFilePath];
    NSMutableArray *array = [NSMutableArray arrayWithCapacity:kNumberOfHighScores];
    for (HighScore *hs in highScoresList) {
        NSDictionary *dict = [hs putIntoDictionary];
        [array addObject:dict];
        [dict release];
    }
    NSDictionary *rootLevelPlistDict = [[NSDictionary alloc] initWithObjectsAndKeys: 
            [[[NSBundle mainBundle] infoDictionary]
                objectForKey:(NSString*)kCFBundleNameKey], kHighScoreAppNameKey,
                [NSNumber numberWithInt:kHighScoreHeaderVersNum], kHighScoreHeaderVersKey,
                [NSNumber numberWithInt:kHighScoreVersNum], kHighScoreVersKey,
                [NSDate date], kHighScoreCreationKey,
             array, kHighScoresKey,
             nil];

    if (![rootLevelPlistDict writeToFile:path atomically:YES])
        NSLog(@"not successful in writing the high scores");
    [rootLevelPlistDict release];
}

关于高分持久性的建议（iPhone，Cocoa Touch）

4 个答案: