ios - 从主线程上的委托(delegate)方法接收答案

Question

我有以下场景:我想在后台线程上多次调用一个方法，但返回值来自委托(delegate)方法，我认为该方法是在主线程上调用的。我如何在后台线程上处理这个问题？

NSOperationQueue *operationQueue = [NSOperationQueue new];
for (int i = 0 ; i < 100; i++) {
    NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
        [self.routingService calculateRoute:self.routeSettings];
    }];
    [self.operationQueue addOperation:blockOperation];
}

//Delegate method
- (void)routingService:(SKRoutingService *)routingService didFinishRouteCalculationWithInfo:(SKRouteInformation *)routeInformation {

    //Here I want to process routeInformation
}

请帮帮我。 :)

Answer 1

您可以在委托(delegate)方法中执行此操作

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    //add your processing code here
});