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NSManagedObjectContext performBlock thread


NSManagedObjectContext performBlock thread

By : user2948987
Date : November 15 2020, 06:54 AM
Any of those help Exactly. You understood the documentation correctly.
"Receiver" refers to the existing context, so if this is a background context, the block will be executed in a background thread, if it is a main context, on the main thread.
code :


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What is NSManagedObjectContext's performBlock: used for?

What is NSManagedObjectContext's performBlock: used for?


By : ShilpaChoudhary
Date : March 29 2020, 07:55 AM
it should still fix some issue The methods performBlock: and performBlockAndWait: are used to send messages to your NSManagedObjectContext instance if the MOC was initialized using NSPrivateQueueConcurrencyType or NSMainQueueConcurrencyType. If you do anything with one of these context types, such as setting the persistent store or saving changes, you do it in a block.
performBlock: will add the block to the backing queue and schedule it to run on its own thread. The block will return immediately. You might use this for long persist operations to the backing store.
code :
__block NSError *error = nil;
[context performBlockAndWait:^{
    myManagedData.field = @"Hello";
    [context save:&error];
}];

if (error) {
    // handle the error.
}
NSManagedObjectContext performBlock within dispatch_async

NSManagedObjectContext performBlock within dispatch_async


By : Shakeel Ahmad
Date : March 29 2020, 07:55 AM
This might help you performBlock: and performBlockAndWait: ensure that the block operations are executed on the queue specified for the context. Therefore, it does not matter on which thread performBlock: or performBlockAndWait: are called.
The extra dispatch_async(dispatch_get_main_queue(), ^{}); is therefore not necessary if [self saveData] uses performBlock: for all operations.
NSManagedObjectContext nil when assigned within performBlock

NSManagedObjectContext nil when assigned within performBlock


By : Tyler Durrett
Date : March 29 2020, 07:55 AM
wish helps you You don't have to use __weak modifier for a context here, as it's not an ivar (so it isn't retained by self). This should work:
code :
NSManagedObjectContext *ctx=[CDC privateManagedObjectContext];
__weak id weakSelf = self;
[ctx performBlock:^{
    __strong id strongSelf = weakSelf;
    // use `ctx` here
}];
NSManagedObjectContext and performBlock, changes on iOS 8?

NSManagedObjectContext and performBlock, changes on iOS 8?


By : user2711841
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further The call -[NSManagedObjectContext init] is just a wrapper for -[NSManagedObjectContext initWithConcurrencyType:] with the argument NSConfinementConcurrencyType. This creates an instance of NSManagedObjectContext that uses the obsolete thread confinement model - which does not uses a queue. Contexts created using init or initWithConcurrencyType: with the value NSConfinementConcurrencyType passed are not compatible with the queue methods performBlock: or performBlockAndWait:.
Create your context using -[NSManagedObjectContext initWithConcurrencyType:] and pass either NSPrivateQueueConcurrencyType or NSMainQueueConcurrencyType as appropriate. The context that is created as a result is compatible with performBlock: and performBlockAndWait: and will uses the queue confinement model that was introduced in iOS 5.
Is [NSManagedObjectContext performBlock] synchronous if run on the context's thread?

Is [NSManagedObjectContext performBlock] synchronous if run on the context's thread?


By : yunhu f
Date : March 29 2020, 07:55 AM
hop of those help? Assuming you mean NSMainQueueConcurrencyType (and not NSConfinementConcurrencyType), calling performBlock: behaves like dispatch_async, i.e. your block will be enqueued and not be executed immediately.
You can verify this easily:
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