MBProgressHUD更改数据输出？

我试图使用MBProgressHUD来显示加载动画，而我正在访问的信息，以平滑从UITableView列表到具有所选项目的详细信息的UIWebView的过程。如果我打电话[self fetchPlayer];没有使用MBProgressHUD我没有问题，一切工作正常，虽然没有动画。但是如果我打电话给[自动加载动画];它一半工作。我第一次从UITableView中选择一些东西，它每次都会正确加载，但如果我回去选择相同或不同的项目，我会经常为playerDetails项目获取空值。我不确定MBProgressHUD方法可以做什么来引起这一点，但这里是代码。 NSLog显示正确的信息 - 但调用这两种方法的主类不能正确输出。MBProgressHUD更改数据输出？

- (void)loadingAnimation { 
// The hud will dispable all input on the view (use the higest view possible in the view hierarchy) 
    HUD = [[MBProgressHUD alloc] initWithView:self.navigationController.view]; 

    // Add HUD to screen 
    [self.navigationController.view addSubview:HUD]; 

    HUD.labelText = @"Loading"; 

    // Show the HUD while the provided method executes in a new thread 
[HUD showWhileExecuting:@selector(fetchPlayer) onTarget:self withObject:nil animated:YES]; 
} 


- (void)fetchPlayer { 
NSManagedObjectContext *pcontext = [[AppController sharedAppController] managedObjectContext]; 

NSFetchRequest *pfetch = [[NSFetchRequest alloc] init]; 

NSEntityDescription *pentity = [NSEntityDescription entityForName:@"Players" 
       inManagedObjectContext:pcontext]; 
[pfetch setEntity:pentity]; 

NSPredicate *ppredicate = [NSPredicate predicateWithFormat:@"playerID=%@", [playerNews playerID]]; 
[pfetch setPredicate:ppredicate]; 

NSError *perror; 
NSArray *plist = [pcontext executeFetchRequest:pfetch error:&perror]; 

playerDetails = [plist objectAtIndex:0]; 

NSLog(@"%@ %@ %@ %@ %@", [playerNews playerID], 
     [playerDetails valueForKey:@"playerFirstName"], 
     [playerDetails valueForKey:@"playerLastName"], 
     [playerDetails valueForKey:@"position"], 
     [playerDetails valueForKey:@"dateOfBirth"]); 

[pfetch release]; 

NSManagedObjectContext *context = [[AppController sharedAppController] managedObjectContext]; 

NSFetchRequest *fetch = [[NSFetchRequest alloc] init]; 

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Teams" 
      inManagedObjectContext:context]; 
[fetch setEntity:entity]; 

if (![playerDetails valueForKey:@"team"]) { 
    team = [playerDetail team]; 
} else { 
    team = [playerDetails valueForKey:@"team"]; 

} 
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"team=%@", team]; 

[fetch setPredicate:predicate]; 

NSError *error; 
NSArray *list = [context executeFetchRequest:fetch error:&error]; 

playerTeam = [list objectAtIndex:0]; 

[fetch release]; 
}

来源

2010-12-01 Nathan

这似乎至少是线程问题。您正在多个线程中共享您的上下文，因为fetchPlayer是由MBProgressHUD在后台线程中执行的。

在后台线程中创建一个新的上下文，并确保NSManagedObjects不在线程间共享。

来源

2010-12-02 05:48:23

MBProgressHUD更改数据输出？

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