iPhone导航控制器堆栈的nscoding序列化

编辑:我似乎找到了一些有用的东西。我保留了IVAR的“堆栈”,现在它似乎在工作

我已经连续化了几个自定义nsObject类,没有问题。现在我想序列化我的导航控制器堆栈。为了重建导航树,每个视图控制器只需要保存几个属性。我已经在视图控制器中实现了nscoding协议,并成功地将它们编码为nsdata并保存到磁盘。

当我尝试加载堆栈时,得到的数组具有正确的对象数,但是当我尝试设置viewcontroller数组时,我总是得到exc ou bad ou访问错误。我是不是走错了路?

//AppDelegate.m
-(void) loadDataFromDisk {
   NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
   NSString *programDataPath = [libraryPath stringByAppendingPathComponent:@"programData.dat"];
   NSData *programData = [[NSData alloc] initWithContentsOfFile:programDataPath];
   NSKeyedUnarchiver *decoder = [[NSKeyedUnarchiver alloc] initForReadingWithData:programData];
   //stack is a mutable array declared in header
   //stack = [decoder decodeObjectForKey:@"stack"];
       stack = [[decoder decodeObjectForKey:@"stack"]retain]; //retain fixes? Seems to work
   [decoder release];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
   // Override point for customization after app launch    
   [window addSubview:[navigationController view]];
   [window makeKeyAndVisible];
   NSLog(@"%@",self.navigationController.viewControllers);
   if ([stack count] > 1) {
           self.navigationController.viewControllers = stack;
           [stack release];  //retained earlier
   }
   return YES;

}