Question

NSMutableData中是否有层次结构系统？如果是这样，我如何以层次结构方式加载信息？实施例

//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

然而在for（游戏数据中的NSArray * firstData）中，编译器告诉我gameData不会响应count，因为它是NSMutableData而不是NSMutableArray等，我如何完全重新实现上面的代码？

Answer 1

保存：

使用您的多个NSData创建NSArray
使用NSKeyedArchiver从NSArray制作NSData

装载：

从文件
使用NSKeyedUnarchiver提取NSArray
循环你的NSArray

在代码中： NSData * data0 = [NSData数据]; //数据1 NSData * data1 = [NSData数据]; //数据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];

在NSMutableData中加载层次结构

1 个答案: