grand-central-dispatch

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Is a GCD dispatch queue enough to confine a Core Data context to a single thread

I\'m beginning to think the answer to my question is \'No\', but I\'m still confused and uncertain about this. So please confirm. I\'ve already learned the need to be careful when using Core Data with[详细]

2023-04-12 06:03 分类：问答
How do I post a NSNotification when using Grand Central Dispatch?

I found that as predicted when I was writing an image to file that my UI was blocked for the duration, which was not acceptable.When I write the image to file I then post an NS Notification so that I[详细]

2023-04-11 06:39 分类：问答
How do I detect Grand Central Dispatch feature support on an iPhone?

I started out thinking I wanted to test or detect if iOS was version 4.x so I would know I could use Grand Central Dispatch to run a concurrent thread. If it was less than iOS 4 I would run the code b[详细]

2023-04-11 06:33 分类：问答
Why should I choose GCD over NSOperation and blocks for high-level applications?

Apple\'s Grand Central Dispatch reference says: \"...if your application needs to operate at the Unix level of the[详细]

2023-04-10 21:30 分类：问答
Correct Singleton Pattern Objective C (iOS)?

I found some information in the net to create a singleton class using GCD. Thats cool because it\'s thread-safe with very low overhead. Sadly I could not find complete solutions but only snippets of t[详细]

2023-04-09 14:22 分类：问答
What's the harm of retain self in block?(Objective-C, GCD)

In many guide about how to use blocks and GCD, one tip is always mentioned : do not retain self in block.[详细]

2023-04-08 10:56 分类：问答
Last In-First Out Stack with GCD?

I have a UITableView that displays images associated with contacts in each row. In some cases these images are read on first display from the address book contact image, and where there isn\'t one the[详细]

2023-04-07 16:56 分类：问答
dispatch_async() in c

I am having problems understanding GCD. ineed to use dispatch_async to spawn the function put_values() which will in an endless loop put values into a buffer. Get_values() will remove then also in an[详细]

2023-04-06 04:56 分类：问答
Correct usage of Grand Central Dispatch with multiple UIActivityIndicatorViews

I am creating a thumbnail viewer consisting of UIButtons, and want to have a spinner in each button until the image gets populated from the cloud.I\'ve done this with single spinners before, but never[详细]

2023-04-06 03:52 分类：问答
C w/ Blocks: Stack-based blocks going out of scope

In one of Apple\'s header files for libdispatch, queue.h, the following warning appears: // The declaration of a block allocates storage on the stack.[详细]

2023-04-05 18:59 分类：问答