NSOperation 等待事件 [英] NSOperation wait for event

问题描述

我想创建一个扩展 NSOperation 的自定义类，以便通过蓝牙与另一台设备成功通信.我的问题是如何实现类的 main 方法，使其等待蓝牙触发的事件?

I'd like to make a custom class that extends NSOperation in order to make successful communication with another device by bluetooth. The question I have is how can I implement the main method of the class so that it will wait for an event triggered by the bluetooth?

推荐答案

永远不要使用无限循环.它不节能.正如@lead_the_zeppelin 所说，使用信号量/互斥量/等.例如，您可以像这样使用 dispatch_group 函数:

Never use an infinite loop. It is not energy-efficient. As @lead_the_zeppelin said, use semaphore/mutex/etc. For example you may use dispatch_group functions like this:

dispatch_group_t waitGroup = dispatch_group_create();
dispatch_group_enter(waitGroup);
dispatch_async(otherQueue, ^{
    //long-running code
    dispatch_group_leave(waitGroup);
}
dispatch_group_wait(waitGroup, DISPATCH_TIME_FOREVER); 

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