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我目前正在尝试向我的应用程序添加游戏保存功能。最终目标是将大约 300 个自定义对象保存到一个.plist文件中，并在以后再次提取它们。我已经取得了一些进展，但我遇到了一些问题，initWithCoder:而且我也不确定我的技术。

a 正在使用以下代码UIViewController来保存对象（例如，我只在字典中添加了 2 个对象）：

//Saves the contents to a file using an NSMutableDictionary
-(IBAction)saveContents {

    //Create the dictionary
    NSMutableDictionary *dataToSave = [NSMutableDictionary new];

    //Add objects to the dictionary
    [dataToSave setObject:label.text forKey:@"label.text"];
    [dataToSave setObject:territory forKey:@"territory"];
    [dataToSave setObject:territory2 forKey:@"territory2"];

    //Archive the dictionary and its contents and set a BOOL to indicate if it succeeds
    BOOL success = [NSKeyedArchiver archiveRootObject:dataToSave toFile:[self gameSaveFilePath]];

    //Handle success/failure here...

    //Remove and free the dictionary
    [dataToSave removeAllObjects]; dataToSave = nil;
}

这成功地调用了类encodeWithCoder:中的函数Territory两次：

-(void)encodeWithCoder:(NSCoder *)aCoder {

    NSLog(@"ENCODING");
    [aCoder encodeObject:self.data forKey:@"data"];
    [aCoder encodeInt:self.MMHValue forKey:@"MMHValue"];
    [aCoder encodeObject:self.territoryName forKey:@"territoryName"];
    //Continue with other objects
}

当我查看目录时，果然，该文件存在。现在，这是我遇到的问题：运行以下函数时，该initWithCoder:函数被成功调用两次。函数内的日志initWithCoder:输出它们应该输出的内容，但函数中的日志UIViewController返回loadContents,0等null。但是，标签的文本设置正确。

//Loads the contents from a file using an NSDictionary
-(IBAction)loadContents {

    //Create a dictionary to load saved data into then load the saved data into the dictionary
    NSDictionary *savedData = [NSKeyedUnarchiver unarchiveObjectWithFile:[self gameSaveFilePath]];

    //Load objects using the dictionary's data
    label.text = [savedData objectForKey:@"label.text"];

    NSLog(@"%i, %i", [territory intAtKey:@"Key4"], [territory2 intAtKey:@"Key4"]);
    NSLog(@"MMH: %i, %i", territory.MMHValue, territory2.MMHValue);
    NSLog(@"NAME: %@, %@", territory.territoryName, territory2.territoryName);

    //Free the dictionary
    savedData = nil;
}

- (id)initWithCoder:(NSCoder *)aDecoder {

    if (self = [super initWithCoder:aDecoder]) {

        NSLog(@"DECODING TERRITORY");

        self.data = [aDecoder decodeObjectForKey:@"data"];
        self.MMHValue = [aDecoder decodeIntForKey:@"MMHValue"];
        self.territoryName = [[aDecoder decodeObjectForKey:@"territoryName"] copy];
        //Continue with other objects
    }

    NSLog(@"DECODED INT: %i", self.MMHValue);
    NSLog(@"DECODED NAME: %@", self.territoryName);
    return self;
}

我一直试图让它工作几个小时，但无济于事。如果有人对此有任何见解，请帮助我。另外，我不完全确定我的保存技术是否良好（使用NSMutableDictionary存储对对象的引用以便输出到一个文件）？谢谢！

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1 回答 1

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我阅读了 Apple 关于NSKeyedArchiver和的文档NSKeyedUnarchiver，以及一堆关于该主题的博客文章，我意识到我做错了什么。在将对象编码到文件后（通过使用键将它们添加到字典，然后将它们保存到 .plist），当我尝试解码它们时，我从未真正从新字典中提取值（保存内容的字典刚刚解码的文件）。这也解释了为什么label's 的文本被加载，但territory没有territory2。我将loadContents函数更改为以下内容，现在代码可以工作了：

-(IBAction)loadContents {

    //Create a dictionary to load saved data into then load the saved data into the dictionary
    NSLog(@"***** STARTING DECODE *****");
    NSDictionary *savedData = [NSKeyedUnarchiver unarchiveObjectWithFile:[self gameSaveFilePath]];
    NSLog(@"***** CALLING initWithCoder: ON OBJECTS *****");
    NSLog(@"***** FINISHED DECODE *****");

    //Load objects using the dictionary's data
    label.text = [savedData objectForKey:@"label.text"];
    territory = [savedData objectForKey:@"territory"];
    territory2 = [savedData objectForKey:@"territory2"];

    //Free the dictionary
    savedData = nil;
}
于 2014-05-08T07:46:25.210 回答