MagicalRecord在导入时保存所有内容之前完成阻止

时间：2015-05-04 17:29:18

标签： objective-c uitableview magicalrecord

当有人登录我的应用程序时，会进行带有JSON响应的调用，并使用此数据将其导入到带有MagicalRecord的Core Data中。 完成所有导入后，将调用一个名为success的块，让我的LoginViewController知道一切正常，并停止p，这样就可以生成一个segue。

它支持新的ViewController，它有一个UIActivityIndicatorView来显示刚刚导入的数据。

我的问题是，这个成功模块被称为之前 MagicalRecord完成了节省。因此，UITableView尚未收到要显示的订单对象。

以下是UITableView块的实现如下：

saveWithBlockAndWait

在我的[MagicalRecord saveWithBlockAndWait:^(NSManagedObjectContext *localContext) { NSDictionary *users = [responseObject valueForKeyPath:@"responses.user"]; [User importFromObject:users inContext:localContext]; NSArray *orders = [responseObject valueForKeyPath:@"responses.orders"]; [Order importFromArray:orders inContext:localContext]; NSLog(@"SAVING DONE"); }]; （女巫是ViewController，也有segue）是另一个OrdersViewController，问题可能在这里。

Xcode的输出显示已经调用了SAVING DONE，但是在我的AFNetworking调用之后。这意味着即使使用NSLog，所有数据都不会保存，也无法显示。此外，输出显示有0行。

该应用程序在我的第二次发布时运作良好。只有在第一次登录时我才遇到这个问题

saveWithBlockAndWait

2015-05-04 19:16:31.617 xxxxx[35555:5569667] +[NSManagedObjectContext(MagicalRecord) MR_contextWithStoreCoordinator:](0xff4a04) -> Created Context UNNAMED 2015-05-04 19:16:31.618 xxxxx[35555:5569667] +[NSManagedObjectContext(MagicalRecord) MR_setRootSavingContext:](0xff4a04) Set Root Saving Context: <NSManagedObjectContext: 0x7aecdf10> 2015-05-04 19:16:31.618 xxxxx[35555:5569667] +[NSManagedObjectContext(MagicalRecord) MR_newMainQueueContext](0xff4a04) Created Main Queue Context: <NSManagedObjectContext: 0x7aff4280> 2015-05-04 19:16:31.618 xxxxx[35555:5569667] +[NSManagedObjectContext(MagicalRecord) MR_setDefaultContext:](0xff4a04) Set Default Context: <NSManagedObjectContext: 0x7aff4280> 2015-05-04 19:16:46.104 xxxxx[35555:5569667] POST 'secret' 2015-05-04 19:16:47.237 xxxxx[35555:5569667] 200 'secret' [1.1324 s] 2015-05-04 19:16:47.258 xxxxx[35555:5569667] POST 'secret' 2015-05-04 19:16:47.880 xxxxx[35555:5569667] 200 'secret' [0.6215 s] 2015-05-04 19:16:47.901 xxxxx[35555:5569667] SAVING DONE 2015-05-04 19:16:47.902 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae251e0) → Saving <NSManagedObjectContext (0x7ae251e0): *** UNNAMED ***> on *** MAIN THREAD *** 2015-05-04 19:16:47.903 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae251e0) → Save Parents? 1 2015-05-04 19:16:47.903 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae251e0) → Save Synchronously? 1 2015-05-04 19:16:47.903 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalRecord) MR_contextWillSave:](0x7ae251e0) Context UNNAMED is about to save. Obtaining permanent IDs for new 2 inserted objects 2015-05-04 19:16:47.906 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Saving <NSManagedObjectContext (0x7aecdf10): *** BACKGROUND SAVING (ROOT) ***> on *** MAIN THREAD *** 2015-05-04 19:16:47.906 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Save Parents? 1 2015-05-04 19:16:47.906 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Save Synchronously? 1 2015-05-04 19:16:47.907 xxxxx[35555:5569667] -[NSManagedObjectContext(MagicalRecord) MR_contextWillSave:](0x7aecdf10) Context BACKGROUND SAVING (ROOT) is about to save. Obtaining permanent IDs for new 2 inserted objects 2015-05-04 19:16:47.909 xxxxx[35555:5569667] __70-[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:]_block_invoke21(0x7aecdf10) → Finished saving: <NSManagedObjectContext (0x7aecdf10): *** BACKGROUND SAVING (ROOT) ***> on *** MAIN THREAD *** 2015-05-04 19:16:47.909 xxxxx[35555:5569667] All data has been setup sucessfully 2015-05-04 19:16:47.909 xxxxx[35555:5569667] Perform Segue To LoginSucessSegue from LoginViewController 2015-05-04 19:16:47.945 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae19130) → Saving <NSManagedObjectContext (0x7ae19130): *** UNNAMED ***> on *** BACKGROUND THREAD *** 2015-05-04 19:16:47.952 xxxxx[35555:5569667] Number of rows: 0 2015-05-04 19:16:47.957 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae19130) → Save Parents? 1 2015-05-04 19:16:47.957 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7ae19130) → Save Synchronously? 0 2015-05-04 19:16:47.958 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalRecord) MR_contextWillSave:](0x7ae19130) Context UNNAMED is about to save. Obtaining permanent IDs for new 4 inserted objects 2015-05-04 19:16:47.962 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Saving <NSManagedObjectContext (0x7aecdf10): *** BACKGROUND SAVING (ROOT) ***> on *** BACKGROUND THREAD *** 2015-05-04 19:16:47.963 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Save Parents? 1 2015-05-04 19:16:48.023 xxxxx[35555:5570918] -[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:](0x7aecdf10) → Save Synchronously? 0 2015-05-04 19:16:48.024 xxxxx[35555:5570924] -[NSManagedObjectContext(MagicalRecord) MR_contextWillSave:](0x7aecdf10) Context BACKGROUND SAVING (ROOT) is about to save. Obtaining permanent IDs for new 4 inserted objects 2015-05-04 19:16:48.026 xxxxx[35555:5570924] __70-[NSManagedObjectContext(MagicalSaves) MR_saveWithOptions:completion:]_block_invoke21(0x7aecdf10) → Finished saving: <NSManagedObjectContext (0x7aecdf10): *** BACKGROUND SAVING (ROOT) ***> on *** BACKGROUND THREAD *** 是否被错误地执行了，因为它对我不起作用？关于如何解决这个问题的建议或解决方案将是非常棒的。

1 个答案:

答案 0 :(得分：0)

您的日志似乎正确无误。首先它运行你的块，然后它将所有内容保存到数据库，然后当前线程继续执行。

您使用同步方法。同步方法阻止当前线程，直到它们完成执行。如果要更新界面，则必须在saveWithBlockAndWait之后立即执行此操作，或使用提供完成处理程序的“save”方法的异步版本。

[MagicalRecord saveWithBlockAndWait:^(NSManagedObjectContext *localContext) {

    NSDictionary *users = [responseObject valueForKeyPath:@"responses.user"];
    [User importFromObject:users inContext:localContext];

    NSArray *orders = [responseObject valueForKeyPath:@"responses.orders"];
    [Order importFromArray:orders inContext:localContext];
}];

NSLog(@"Saving done.");

通常，最好使用异步方法来避免阻塞主线程。

[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {


   // create or update CoreData models


} completion:^(BOOL contextDidSave, NSError *error) {
   if(error) {
      NSLog(@"Failed to save data");
      return;
   }

   NSLog(@"Saving done.");

   [self.activityIndicator stopAnimating];
}];
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