在NSMutableData中加载层次结构

Question

NSMutableData中是否存在层次结构系统？如果是这样，我如何以层次结构的方式加载信息？ 例

//Create path to saving location 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 

NSMutableData *gameData; 
NSKeyedUnarchiver *decoder; 
NSString *documentPath = [documentsDirectory stringByAppendingPathComponent:@"tierSave.dat"]; 
gameData = [NSData dataWithContentsOfFile:documentPath]; 
//end 

//start loading 
    for(NSArray* firstData in gameData){ 

    decoder = [[NSKeyedUnarchiver alloc] initForReadingWithData:gameData]; 

    int level1 = [decoder decodeIntegerForKey:level1]; 
    } 
//end 

但是在（NSArray中*第一资讯在GAMEDATA），编译器告诉我，因为它是一个NSMutableData代替的NSMutableArray等GAMEDATA不会响应来算，我怎么恰好重新实现代码以上？

Answer 1

节能：

• 与多个NSData的
• 使用的NSKeyedArchiver创建一个NSArray的从你的NSArray做出的NSData

加载：

• 从文件加载一个的NSData
• 使用NSKeyedUnarchiver提取所述的NSArray
• 环路您的NSArray

在代码： 的NSData * DATA0 = [NSData的数据]; // Data 1 NSData * data1 = [NSData data]; // Data 2

/////////// SAVE 
// now make a array 
NSArray *array = [NSArray arrayWithObjects:data0, data1, nil]; 

// now archive the data 
NSData *archivedData = [NSKeyedArchiver archivedDataWithRootObject:array]; 
// archivedData contains now a binary plist with your archived array including your NSData objects 

[archivedData writeToFile:path atomically:YES]; 



/////// LOAD 
NSData *archivedDataFromFile = [NSData dataWithContentsOfFile:path]; 

NSArray *newArray = [NSKeyedUnarchiver unarchiveObjectWithData:archivedDataFromFile]; 

NSData *dataLoaded0 = [newArray objectAtIndex:0];