grand-central-dispatch

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Why do Cocoa games avoid Grand Central Dispatch for creating a timer?

I\'m looked a far deal around the internet discussing creating game loops in Cocoa. Most of the game loops I\'ve seen use NSTimer to trigger an event every 60th of a second. Why does there appear to b[详细]

2023-02-10 17:57 分类：问答
Multithreading and autorelease pool

As I\'m mastering my skills with multithreading with GCD, I\'ve come across some question. Suppose you have the following method:[详细]

2023-02-10 00:30 分类：问答
What GCD queue, main or not, am I running on?

I am trying to write some thread safe methods so I am using: ... dispatch_queue_t main = dispatch_get_main_queue();[详细]

2023-02-09 04:47 分类：问答
Objective-C and Quartz Composer; [qcView pauseRendering] causes Bad_Access

thanks in advance. I have a Quartz Composer View (qcView below) and move an image (of an ant, if you were wondering of the code) in a random direction until it finds it\'s \'home\' in the middle of[详细]

2023-02-08 14:45 分类：问答
Applying Effect to iPhone Camera Preview "Video"

My goal is to write a custom camera view controller that: Can take photos in all four interface orientations with both the back and, when available, front camera.[详细]

2023-02-08 05:39 分类：问答
When to dispatch_release()?

I\'m fairly new to GCD and was trying to find an answer to this. Assuming I have the following code: dis开发者_运维技巧patch_queue_t queue = dispatch_queue_create(\"queue\", NULL);[详细]

2023-02-07 18:02 分类：问答
How many threads should Grand Central Dispatch be creating?

I understand that GCD will only create as many threads as needed to make best use of the CPU. In code using dispatch_async to launch about 30 background task开发者_如何学JAVAs, I\'m seeing the number[详细]

2023-02-07 16:47 分类：问答
iPhone - GCD check if queue is suspended

I have to use dispatch_resume(...); to resume a dispatch that was suspended, but as the method resuming the dispatch may be called by several parts of the app, I need to know if the dispatch is suspen[详细]

2023-02-07 14:57 分类：问答
suspending dispatch timers from main_queue when it was created on another one

Can you suspend a GCD timer from a queue besides the one it\'s schedule to run on? I have a time开发者_如何学Cr, created on the global_queue with low priority and when it fires, I manipulate some UI[详细]

2023-02-07 04:52 分类：问答
DISPATCH_SOURCE_TYPE_TIMER not firing

I\'m creating a timer on the global queue, configured to fire 45 seconds from creation time but for some reason, it doesn\'t seem to fire at all. Changing it to fire now also doesn\'t do anything.[详细]

2023-02-06 09:43 分类：问答