在NSOperationQueue中的dispatch_after等价物 [英] dispatch_after equivalent in NSOperationQueue
问题描述
我正在将我的代码从常规GCD转移到 NSOperationQueue ，因为我需要一些功能。我的很多代码都依赖dispatch_after才能正常工作。有没有办法用 NSOperation 做类似的事情？
I'm moving my code from regular GCD to NSOperationQueue because I need some of the functionality. A lot of my code relies on dispatch_after in order to work properly. Is there a way to do something similar with an NSOperation?
这是我需要的一些代码转换为 NSOperation 。如果您可以提供使用此代码转换它的示例，那就太棒了。
This is some of my code that needs to be converted to NSOperation. If you could provide an example of converting it using this code, that would be great.
dispatch_queue_t queue = dispatch_queue_create("com.cue.MainFade", NULL);
dispatch_time_t mainPopTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(timeRun * NSEC_PER_SEC));
dispatch_after(mainPopTime, queue, ^(void){
if(dFade !=nil){
double incriment = ([dFade volume] / [self fadeOut])/10; //incriment per .1 seconds.
[self doDelayFadeOut:incriment with:dFade on:dispatch_queue_create("com.cue.MainFade", 0)];
}
});
推荐答案
NSOperationQueue 中没有任何计时机制。如果您需要设置这样的延迟然后执行操作，您需要从 dispatch_after NSOperation $ c>为了处理延迟并使最终代码成为 NSOperation 。
NSOperationQueue doesn't have any timing mechanism in it. If you need to set up a delay like this and then execute an operation, you'll want to schedule the NSOperation from the dispatch_after in order to handle both the delay and making the final code an NSOperation.
NSOperation 旨在处理或多或少的批处理操作。用例与GCD略有不同，实际上在使用GCD的平台上使用GCD。
NSOperation is designed to handle more-or-less batch operations. The use case is slightly different from GCD, and in fact uses GCD on platforms with GCD.
如果您要解决的问题是获取可取消的计时器通知，我建议使用 NSTimer 如果您需要取消它，它将使其无效。然后，为响应计时器，您可以执行代码，或使用调度队列或NSOperationQueue。
If the problem you are trying to solve is to get a cancelable timer notification, I'd suggest using NSTimer and invalidating it if you need to cancel it. Then, in response to the timer, you can execute your code, or use a dispatch queue or NSOperationQueue.
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