Moya - chain requests with NSOperation

Question

我有几个请求需要链接。我可以这样做

provider.request(.apples) { (result) in
        switch result {
        case .success(let response):

           provider.request(.oranges) { (result) in
                switch result {
                case .success(let response):

                   ...couple of other fruits

                case .failure(let error):
                  print(error)
        }
    }

        case .failure(let error):
            print(error)
        }
    }

但是我想用NSOperation链接它们。

我该怎么做呢？

Answer 1

我是Swift的初学者，但通过代码我明白你是在请求“苹果”。如果该请求成功，则再次请求“Orange”，如果成功，则请求其他水果，依此类推。

是的，你可以使用NSOperation链接它们，请参考我对以下问题的回答，我已经列出了两种不同的方法。

Do NSOperations and their completionBlocks run concurrently?

注意:这里有几种场景: 1)是否只有苹果请求成功才需要请求橙子，只有在橙子:请求成功的情况下才需要请求其他水果，这种情况下可以参考上述问题的答案。示例流程如下：

RequestFruitOperation *requestApplesOperation = [[RequestFruitOperation alloc] initWithFruitType:Apples];

[requestApplesOperation setCompletionBlock:^{
    if(requestApplesOperation.success){
        //add oranges
        RequestFruitOperation *requestOrangesOperation = [[RequestFruitOperation alloc] initWithFruitType:Oranges];
        [requestOrangesOperation setCompletionBlock:^{
            if(requestOrangesOperation.success) {
                //add mangoes
                RequestFruitOperation *requestMangosOperation = [[RequestFruitOperation alloc] initWithFruitType:Mangos];
                [operationQueue addOperation:requestMangosOperation];
            }
        }];
        [operationQueue addOperation:requestOrangesOperation];
    }

}
 [operationQueue addOperation:requestApplesOperation];

2)如果你可以并行请求“苹果”，“橙子”和“其他水果”，而不是等待对方成功，那么你就不需要链接它们。您可以只将操作添加到队列中。

RequestFruitOperation *requestApplesOperation = [[RequestFruitOperation alloc] initWithFruitType:Apples];
[operationQueue addOperation:requestApplesOperation];

RequestFruitOperation *requestOrangesOperation = [[RequestFruitOperation alloc] Oranges];
[operationQueue addOperation:requestOrangesOperation];

RequestFruitOperation *requestMangosOperation = [[RequestFruitOperation alloc] Mangos];
[operationQueue addOperation:requestMangosOperation];