Ios 后台线程方法无法解决冻结问题_Ios_Multithreading_Core Data

Ios 后台线程方法无法解决冻结问题

ios multithreading core-data

Ios 后台线程方法无法解决冻结问题,ios,multithreading,core-data,Ios,Multithreading,Core Data,我有我的应用程序冻结问题，所以我使用仪器查找问题，发现问题与CoreData保存和获取有关。我尝试过后台coredata方法（父子、通知），但我的问题尚未解决。我也提到了，但不知道这个方法是如何在我的应用程序中实现的仪器日志：保存到数据库 -(void)updateThreadEntityWithSyncDetails:(NSMutableDictionary *)inDictionary { NSString *loginUser=[[NSUserDefaults stand

我有我的应用程序冻结问题，所以我使用仪器查找问题，发现问题与CoreData保存和获取有关。我尝试过后台coredata方法（父子、通知），但我的问题尚未解决。我也提到了，但不知道这个方法是如何在我的应用程序中实现的

仪器日志：

保存到数据库

  -(void)updateThreadEntityWithSyncDetails:(NSMutableDictionary *)inDictionary
  {

 NSString *loginUser=[[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

 AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [sharedDelegate managedObjectContext];

  //    NSManagedObjectContext *writerContext = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
  //   [writerContext setPersistentStoreCoordinator:[sharedDelegate persistentStoreCoordinator]];

 // create main thread MOC
//    context = [[NSManagedObjectContext alloc]        initWithConcurrencyType:NSMainQueueConcurrencyType];
    //    context.parentContext = writerContext;

   // NSManagedObjectContext *contextforThread = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];

  // contextforThread.parentContext = context;

 // [contextforThread performBlock:^{




NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setReturnsObjectsAsFaults:NO];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"ThreadInfo"
                                          inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSPredicate *userPredicate = [NSPredicate predicateWithFormat:@"userEmail == %@",loginUser];
NSPredicate *threadPredicate = [NSPredicate predicateWithFormat:@"threadID == %@",[inDictionary valueForKey:@"thread"]];
NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates: @[userPredicate, threadPredicate]];
[fetchRequest setPredicate:compoundPredicate];

NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
for (ThreadInfo *threadInfo in fetchedObjects)
{
    if([[inDictionary allKeys] containsObject:@"userEmail"])
    {
        if([inDictionary valueForKey:@"userEmail"]!=[NSNull null])
        {
            threadInfo.userEmail=[inDictionary valueForKey:@"userEmail"];
        }
    }
    if([[inDictionary allKeys] containsObject:@"badgeValue"])
    {
        if([inDictionary valueForKey:@"badgeValue"]!=[NSNull null])
        {
            threadInfo.badgeValue=[inDictionary valueForKey:@"badgeValue"];
        }
    }


    if([[inDictionary allKeys] containsObject:@"choice4Percentage"])
    {
        if([inDictionary valueForKey:@"choice4Percentage"]!=[NSNull null])
        {
            threadInfo.choice4Percentage=[inDictionary valueForKey:@"choice4Percentage"];
        }
    }
    if([[inDictionary allKeys] containsObject:@"choice5Percentage"])
    {
        if([inDictionary valueForKey:@"choice5Percentage"]!=[NSNull null])
        {
            threadInfo.choice5Percentage=[inDictionary valueForKey:@"choice5Percentage"];
        }
    }

 }

    NSError *error;
    if(![context save:&error]) {
        NSLog(@"Child error : %@",error);

    }

   // [context performBlock:^{
   //     NSError *error;
   //     if(![context save:&error]) {
   //         NSLog(@"%@",error);
   //     }
   //            }];
   // }];


 }

获取

-(ThreadInfo *)retrieveSolicitationInfoForThreadID:(NSString*)inThreadID;
 {
NSString *loginUser=[[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSManagedObjectContext *context = [sharedDelegate managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
[fetchRequest setReturnsObjectsAsFaults:NO];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"ThreadInfo"
                                          inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSPredicate *userPredicate = [NSPredicate predicateWithFormat:@"userEmail == %@",loginUser];
NSPredicate *threadPredicate = [NSPredicate predicateWithFormat:@"threadID == %@",inThreadID];
\
NSPredicate *compoundPredicate = [NSCompoundPredicate andPredicateWithSubpredicates: @[userPredicate, threadPredicate]];

[fetchRequest setPredicate:compoundPredicate];

NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
if(fetchedObjects.count!=0)
{
    ThreadInfo *threadInfo=[fetchedObjects objectAtIndex:0];
    return threadInfo;
}
return nil;
}

同步

-(void)updateSolicitationWithSyncDetails:(NSDictionary *)inDictionary
 {    
NSMutableDictionary *paramDict=[NSMutableDictionary dictionaryWithDictionary:inDictionary];
NSString *userEmail=[[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

[paramDict setObject:[NSNumber numberWithBool:NO] forKey:@"isSystemMessage"];
[paramDict setObject:userEmail forKey:@"userEmail"];

if([[inDictionary allKeys] containsObject:@"owned"])
{
   BOOL isDuplicate=[[IXDataBaseManager sharedNetworkDataManager] checkForExistenceOfThreadDetailsForSolicitationID:[inDictionary objectForKey:@"solicitation"]];// FETCH
    if(!isDuplicate)
    {
        int randomIndex=[[IXNetworkDataManager sharedNetworkDataManager] getIndexForColorImageForTab:@"OUT"];
        [paramDict setObject:message forKey:@"threadDescription"];
        [paramDict setObject:[NSNumber numberWithInt:randomIndex] forKey:@"colorCode"];

     BOOL isDuplicateVal=[[IXDataBaseManager sharedNetworkDataManager] checkForExistenceOfSolicitationID:[inDictionary objectForKey:@"solicitation"]];// FETCH
   [paramDict setObject:message forKey:@"threadDescription"];

  ThreadInfo *threadInfo=[[IXDataBaseManager sharedNetworkDataManager] retrieveSolicitationInfoForThreadID:[inDictionary objectForKey:@"solicitation"]];
  [paramDict setObject:threadInfo.threadID forKey:@"thread"];
  [[IXDataBaseManager sharedNetworkDataManager] updateThreadEntityWithSyncDetails:paramDict];
    }
}
}

//使用父-子上下文的方法

[UIAppDelegate.childManagedObjectContext performBlock:^{


         for (int i=0; i<count; i++) {
             //Fill Database and save it in child context first for each entry and save it in child context
             [UIAppDelegate.childManagedObjectContext save:nil];
        }

        dispatch_sync(dispatch_get_main_queue(), ^{

         //Finally when u have inserted all entries save in the parent context
            [UIAppDelegate.managedObjectContext save:nil];



        });

    }]

[UIAppDelegate.childManagedObjectContext执行锁：^{
对于（int i=0；i
//使用父-子上下文的方法
[UIAppDelegate.childManagedObjectContext performBlock:^{


         for (int i=0; i<count; i++) {
             //Fill Database and save it in child context first for each entry and save it in child context
             [UIAppDelegate.childManagedObjectContext save:nil];
        }

        dispatch_sync(dispatch_get_main_queue(), ^{

         //Finally when u have inserted all entries save in the parent context
            [UIAppDelegate.managedObjectContext save:nil];



        });

    }]

[UIAppDelegate.childManagedObjectContext执行锁：^{
对于（int i=0；i您是否尝试为操作使用单独的上下文，并在保存后将其与mainContext合并
例如
导入完成后，保存localContext

NSError * error = nil;
if (![[self localContext] save:&error]) {
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}

这将把数据写入PersistentStore
现在需要将PersistentStore中的更改告知mainContext。这是通过观察通知来完成的
e、 g
这是对通知作出反应的方法：
- (void)didSaveNotification:(NSNotification *)notification
{
    //    NSLog(@"%s %@\n",__PRETTY_FUNCTION__,[notification userInfo]);
    NSManagedObjectContext * mainContext = [self managedObjectContext];
    void (^mergeChanges)(void)=^{
        [mainContext mergeChangesFromContextDidSaveNotification:notification];
    };
    if([NSThread isMainThread]) {
        mergeChanges();
    } else {
        dispatch_sync(dispatch_get_main_queue(), mergeChanges);
    }
}

使用不同的NSManagedContext在同一个PersistentStore上工作比使用单个NSManagedContext更具线程安全性。
您是否尝试为操作使用单独的上下文，并在保存后将其与mainContext合并
例如
导入完成后，保存localContext

NSError * error = nil;
if (![[self localContext] save:&error]) {
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
}

这将把数据写入PersistentStore
现在需要将PersistentStore中的更改告知mainContext。这是通过观察通知来完成的
e、 g
这是对通知作出反应的方法：
- (void)didSaveNotification:(NSNotification *)notification
{
    //    NSLog(@"%s %@\n",__PRETTY_FUNCTION__,[notification userInfo]);
    NSManagedObjectContext * mainContext = [self managedObjectContext];
    void (^mergeChanges)(void)=^{
        [mainContext mergeChangesFromContextDidSaveNotification:notification];
    };
    if([NSThread isMainThread]) {
        mergeChanges();
    } else {
        dispatch_sync(dispatch_get_main_queue(), mergeChanges);
    }
}

使用不同的NSManagedContext处理同一个PersistentStore比使用单个NSManagedContext更安全。
首先，感谢您立即提供代码片段和跟踪。这非常有用
所以，看看跟踪和代码
-updateThreadEntityWithSyncDetails:
正在主线程上调用，占花费时间的33%。不太好
您正在为错误传递nil
：
永远不要这样做。始终传递错误指针并检查调用结果以查看是否有错误
这个条件可以更简洁：
if([[inDictionary allKeys] containsObject:@"userEmail"])
{
    if([inDictionary valueForKey:@"userEmail"]!=[NSNull null])
    {
        threadInfo.userEmail=[inDictionary valueForKey:@"userEmail"];
    }
}

考虑：
if (inDictionary[@"userEmail"] != nil && inDictionary[@"userEmail"] != [NSNull null]) {
    threadInfo.userEmail = inDictionary[@"userEmail"];
}

更容易阅读
此方法的重写将使工作脱离主线程：
- (void)updateThreadEntityWithSyncDetails:(NSMutableDictionary*)inDictionary
{
    NSString *loginUser = [[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

    AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    [context setParentContext:[sharedDelegate managedObjectContext]];

    [context performBlock:^{
        NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ThreadInfo"];
        [fetchRequest setReturnsObjectsAsFaults:NO];
        [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"userEmail == %@ && threadID == %@",loginUser, inDictionary[@"thread"]];

        NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
        for (ThreadInfo *threadInfo in fetchedObjects) {
            if (inDictionary[@"userEmail"] != nil && inDictionary[@"userEmail"] != [NSNull null]) {
                threadInfo.userEmail = inDictionary[@"userEmail"];
            }
            if (inDictionary[@"badgeValue"] != nil && inDictionary[@"badgeValue"] != [NSNull null]) {
                threadInfo.badgeValue = inDictionary[@"badgeValue"];
            }
            if (inDictionary[@"choice4Percentage"] != nil && inDictionary[@"choice4Percentage"] != [NSNull null]) {
                threadInfo.choice4Percentage = inDictionary[@"choice4Percentage"];
            }
            if (inDictionary[@"choice5Percentage"] != nil && inDictionary[@"choice5Percentage"] != [NSNull null]) {
                threadInfo.choice5Percentage = inDictionary[@"choice5Percentage"];
            }
        }

        NSError *error = nil;
        if (![context save:&error]) {
            NSLog(@"Child error : %@",error);

        }
    }];
}

但是它可能仍然会阻塞主线程，因为我猜大部分CPU时间都在执行此提取。提取速度很慢。在该提取中有两个字符串比较。这是错误的，应该予以纠正。如果ThreadID不是字符串，则反转提取。否则，这只是糟糕的数据模型设计，不存在错误除了修好那道墙外，不会有什么帮助的
另一个真正慢的地方是-检查ReadDetailsForThreadId:
的存在性。您没有发布该方法，但我怀疑这是同一个问题，您的获取花费了大量时间，并且它位于主队列上
总的来说，这个设计很差，需要重新处理。您正在比较数据存储中的字符串，这是检索数据最慢的方法之一。您也在主线程上，处理看起来不需要在主线程上的内容
请记住黄金法则，如果用户未对数据进行操作，则操作不得在主队列上。没有例外。
首先，感谢您立即提供代码片段和跟踪。这非常有用
所以，看看跟踪和代码
-updateThreadEntityWithSyncDetails:
正在主线程上调用，占花费时间的33%。不太好
您正在为错误传递nil
：
永远不要这样做。始终传递错误指针并检查调用结果以查看是否有错误
这个条件可以更简洁：
if([[inDictionary allKeys] containsObject:@"userEmail"])
{
    if([inDictionary valueForKey:@"userEmail"]!=[NSNull null])
    {
        threadInfo.userEmail=[inDictionary valueForKey:@"userEmail"];
    }
}

考虑：
if (inDictionary[@"userEmail"] != nil && inDictionary[@"userEmail"] != [NSNull null]) {
    threadInfo.userEmail = inDictionary[@"userEmail"];
}

更容易阅读
此方法的重写将使工作脱离主线程：
- (void)updateThreadEntityWithSyncDetails:(NSMutableDictionary*)inDictionary
{
    NSString *loginUser = [[NSUserDefaults standardUserDefaults] valueForKey:@"currentUser"];

    AppDelegate *sharedDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

    NSManagedObjectContext *context = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSPrivateQueueConcurrencyType];
    [context setParentContext:[sharedDelegate managedObjectContext]];

    [context performBlock:^{
        NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:@"ThreadInfo"];
        [fetchRequest setReturnsObjectsAsFaults:NO];
        [fetchRequest setPredicate:[NSPredicate predicateWithFormat:@"userEmail == %@ && threadID == %@",loginUser, inDictionary[@"thread"]];

        NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:nil];
        for (ThreadInfo *threadInfo in fetchedObjects) {
            if (inDictionary[@"userEmail"] != nil && inDictionary[@"userEmail"] != [NSNull null]) {
                threadInfo.userEmail = inDictionary[@"userEmail"];
            }
            if (inDictionary[@"badgeValue"] != nil && inDictionary[@"badgeValue"] != [NSNull null]) {
                threadInfo.badgeValue = inDictionary[@"badgeValue"];
            }
            if (inDictionary[@"choice4Percentage"] != nil && inDictionary[@"choice4Percentage"] != [NSNull null]) {
                threadInfo.choice4Percentage = inDictionary[@"choice4Percentage"];
            }
            if (inDictionary[@"choice5Percentage"] != nil && inDictionary[@"choice5Percentage"] != [NSNull null]) {
                threadInfo.choice5Percentage = inDictionary[@"choice5Percentage"];
            }
        }

        NSError *error = nil;
        if (![context save:&error]) {
            NSLog(@"Child error : %@",error);

        }
    }];
}

但是它可能仍然会阻塞主线程，因为我猜大部分CPU时间都在执行此提取。提取速度很慢。在该提取中有两个字符串比较。这是错误的，应该予以纠正。如果ThreadID不是字符串，则反转提取。否则，这只是糟糕的数据模型设计，不存在错误除了修好那道墙外，不会有什么帮助的
另一个真正慢的地方是-检查ReadDetailsForThreadId:
的存在性。您没有发布该方法，但我怀疑这是同一个问题，您的获取花费了大量时间，并且它位于主队列上
总的来说，这个设计很差，需要重新处理。您正在比较数据存储中的字符串，这是检索数据最慢的方法之一。您也在主线程上，处理看起来不需要在主线程上的内容
记住这条黄金法则，如果数据没有被用户操纵，那么操纵就不能在主队列上。没有例外。
可能是因为使用了两个上下文，如果使用三个上下文会怎么样？workContext Maincontext ChildContext。你知道如何实现这一个吗？我尝试过这个方法，但仍然没有成功应用程序正在冻结。在保存之前，存在一些获取操作，这也会导致问题，您可以查看我的探查器日志。我如何有效地使用这两个工具？这篇文章解释得很好。另外，我已经编辑了代码。请签入您的代码为什么两次保存mainObjectcontext？如果我们已经使用通知，那么为什么需要[UIAppDelegate.managedObjectContext保存：无]；？抱歉