Question

我陷入困境，如果不进行同步网络通话，我似乎无法进步。这是代码：

    __block NSInteger duration = 0;
    NSInteger index = [pathPoints indexOfObject:@(minutes)
                                  inSortedRange:NSMakeRange(0, pathPoints.count)
                                        options:NSBinarySearchingFirstEqual | NSBinarySearchingInsertionIndex usingComparator:^NSComparisonResult(id obj1, id obj2) {
        if ([obj1 class] == [CLLocation class]) {
            [OTGNetworkRequest fetchDistanceBetweenStart:self.startLocation andEnd:(CLLocation *)obj1 success:^(AFHTTPRequestOperation *operation, id responseObject) {
                NSDictionary *json = responseObject;
                NSDictionary *element = json[@"rows"][0][@"elements"][0];
                duration = [element[@"duration"][@"value"] intValue];
            }];
                NSInteger seconds = [obj2 intValue] * 60;
                return [@(duration) compare:@(seconds)];
        } else {
            [OTGNetworkRequest fetchDistanceBetweenStart:self.startLocation andEnd:(CLLocation *)obj2 success:^(AFHTTPRequestOperation *operation, id responseObject) {
                NSDictionary *json = responseObject;
                NSDictionary *element = json[@"rows"][0][@"elements"][0];
                duration = [element[@"duration"][@"value"] intValue];
            }];
            NSInteger seconds = [obj1 intValue] * 60;
            return [@(seconds) compare:@(duration)];
        }
    }];

所以，问题是我正在尝试设置持续时间，这需要对Google Distance API进行网络调用。但是，当我返回NSComparisonResult时，还没有设置持续时间。在返回之前，如何确保正确设置持续时间？我不能把它放在成功回调中，因为成功的回调块不应该返回任何东西。

我是否被迫使用同步网络电话，或者我没有通过正确的方式解决这个问题？

iOS AFNetworking同步通话

0 个答案: