如何在NSOperationQueue中暂停NSOperation？ [英] How can I Pause a NSOperation in a NSOperationQueue?

问题描述

我需要暂停一个运行的NSOperation插入一个NSOperationQueue。目前我取消所有操作并重新启动它们。但这将导致在所完成的过程中出现某种重复。我尝试使用NSOperationQueue的setSuspended标志。但它不会暂停操作。有什么办法吗？

I need to pause a running NSOperation which was inserted in an NSOperationQueue. Currently I am canceling all operations and restarting them. But this would lead to some kind of duplication in terms of process done. I tried with setSuspended flag of NSOperationQueue. But it's not suspending the operation. Is there any way out?

推荐答案

请参阅：链接

此处来自苹果文档：

暂停和恢复队列
如果您要发出临时停止执行操作，可以使用setSuspended：方法暂停相应的操作队列。

Suspending and Resuming Queues If you want to issue a temporary halt to the execution of operations, you can suspend the corresponding operation queue using the setSuspended: method.

暂停队列不会导致已执行的操作在任务中暂停。它只是阻止新操作被调度执行。您可以暂停一个队列以响应用户请求，暂停任何正在进行的工作，因为期望用户最终可能希望恢复该工作。

Suspending a queue does not cause already executing operations to pause in the middle of their tasks. It simply prevents new operations from being scheduled for execution. You might suspend a queue in response to a user request to pause any ongoing work, because the expectation is that the user might eventually want to resume that work.

这篇关于如何在NSOperationQueue中暂停NSOperation？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！