如何在[GMSPlacesClient autocompleteQuery]中取消正在进行的请求？ [英] How can I cancel an ongoing request in [GMSPlacesClient autocompleteQuery]?

问题描述

我想在我的应用中添加自动填充功能。
我的想法是使用autocompleteQuery：bounds：filter：来自GMSPlacesClient类的回调。
当用户输入时，我想调用该方法，但我想如果我发送了多个请求，我可能会收到无序响应。出于这个原因，我想取消现有的，但我没有看到一种方法。
也许它是在内部实现的，我不知道。
任何帮助或建议？非常感谢。

I would like to add autocomplete feature to my app. My idea is to use autocompleteQuery:bounds:filter:callback from GMSPlacesClient class. While user is typing, I would like to call that method, but I guess if I send several requests, I could receive responses out of order. For that reason I would like to cancel the current one, but I don't see a way. Maybe it is implemented internally, I don't know. Any help or suggestion? Thanks a lot.

我意识到答案可能会失灵。我用文本字段和一个表创建了一个小样本。
我每次用户点击一封信时都会发出请求，结果显示没有自动请求取消或订单。

I realised responses could come out of order. I created a small sample with a textfield and one table. I sent a request every time user taps a letter and the results say that there is no automatic request cancelation or order.

2015-11-13 15:16:14.668 TestGooglePlaces[5233:60b] u
2015-11-13 15:16:15.550 TestGooglePlaces[5233:60b] ut
2015-11-13 15:16:15.700 TestGooglePlaces[5233:60b] uto
2015-11-13 15:16:15.967 TestGooglePlaces[5233:60b] utop
2015-11-13 15:16:16.552 TestGooglePlaces[5233:60b] utopi
2015-11-13 15:16:23.035 TestGooglePlaces[5233:60b] Results for u
2015-11-13 15:16:23.079 TestGooglePlaces[5233:60b] Results for utop
2015-11-13 15:16:23.087 TestGooglePlaces[5233:60b] Results for utopi
2015-11-13 15:16:23.093 TestGooglePlaces[5233:60b] Results for ut
2015-11-13 15:16:23.155 TestGooglePlaces[5233:60b] Results for uto

我怎么能解决这个问题？我唯一的想法是使用REST Web服务并手动取消正在进行的请求。

How can I fix that problem? The only idea I have is to use the REST web service and cancel the ongoing requests manually.

推荐答案

我们在Places API上iOS团队已经意识到这个问题并且正在努力解决它。在SDK的下一个版本中，我们将有一个类来负责管理这些请求并以正确的顺序返回它们。

We on the Places API for iOS team are aware of this problem and are working on it. In the next release of the SDK we'll have a class which takes care of managing these requests and returning them in the correct order.

在此期间，您可以管理这些请求通过跟踪请求进入的顺序并忽略响应（如果它们太旧）：

In the meantime, you can manage these requests by keeping track of the order that the requests came in and ignoring responses if they're too old:

@implementation YourClass {
  NSUInteger _sequenceNumber;
  __block NSUInteger _mostRecentResponseNumber;
}

- (void)autocompleteQuery:(NSString *)query {
  NSUInteger thisSequenceNumber = ++_sequenceNumber;
  [_placesClient autocompleteQuery:query
                            bounds:nil
                            filter:nil
                          callback:^(NSArray * _Nullable results, NSError * _Nullable error) {
                            if (thisSequenceNumber <= _mostRecentResponseNumber) {
                              return;
                            }
                            _mostRecentResponseNumber = thisSequenceNumber;
                            // process results here
                      }];
}

不是最好的，但它应该有效，直到我们发布更好的做法这个:)）

Not the nicest, but it should work until we release a better way of doing this :)

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