Question

我有几种方法可以返回由

创建的信号

+ (RACSignal *)createSignal:

在信号中，我使用AFNetworking中AFHTTPRequestOperationManager的方法发送不同的请求：

- GET:parameters:success:failure
- POST:parameters:success:failure
- PUT:parameters:success:failure
- DELETE:parameters:success:failure

假设我有一个属性来存储AFHTTPRequestOperationManager的实例：

@property(strong, nonatomic) AFHTTPRequestOperationManager *manager;

这是GET请求方法的主体，除了来自AFHTTPRequestOperationManager的方法调用之外，其他几乎与它相同：

- (RACSignal *)GET:(NSString *)url parameters:(NSDictionary *)parameters {
  @weakify(self)
  return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
    @strongify(self)
 // [self.manager POST:...
 // [self.manager PUT:...
 // [self.manager DELETE:...
    [self.manager GET:url parameters:parameters success:^(AFHTTPRequestOperation *operation, NSDictionary *response) {
      [subscriber sendNext:response];
      [subscriber sendCompleted];
  } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
      [subscriber sendError:error];
  }];
  return nil;
}];

我想提取[self.manager GET...]逻辑，以便我可以消除重复的代码，只传递不同的选择器（或类似的东西）来发送不同的请求。

我如何实现它？

Answer 1

这是未经测试的，但应该让你大部分时间都在那里：

- (RACSignal *)GET:(NSString *)url parameters:(NSDictionary *)parameters {
  SEL sel = @selector(GET:parameters:success:failure:);
  return [self signalForRequest:sel url:url parameters:parameters];
}

- (RACSignal *)POST:(NSString *)url parameters:(NSDictionary *)parameters {
  SEL sel = @selector(POST:parameters:success:failure:);
  return [self signalForRequest:sel url:url parameters:parameters];
}

- (RACSignal *)PUT:(NSString *)url parameters:(NSDictionary *)parameters {
  SEL sel = @selector(PUT:parameters:success:failure:);
  return [self signalForRequest:sel url:url parameters:parameters];
}

- (RACSignal *)DELETE:(NSString *)url parameters:(NSDictionary *)parameters {
  SEL sel = @selector(DELETE:parameters:success:failure:);
  return [self signalForRequest:sel url:url parameters:parameters];
}

- (RACSignal *)signalForRequest:(SEL)requestSEL url:(NSURL *)url parameters:(NSDictionary *)parameters {
  @weakify(self);

  return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
    @strongify(self);

    void (^success)(AFHTTPRequestOperation *, NSDictionary *) = ^(AFHTTPRequestOperation *operation, NSDictionary *response) {
      [subscriber sendNext:response];
      [subscriber sendCompleted];
    };
    void (^failure)(AFHTTPRequestOperation *, NSDictionary *) = ^(AFHTTPRequestOperation *operation, NSError *error) {
      [subscriber sendError:error];
    };

    NSMethodSignature *methodSignature = [self.manager methodSignatureForSelector:requestSEL];
    NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:methodSignature];
    [invocation setSelector:requestSEL];
    [invocation setTarget:self.manager];
    [invocation rac_setArgument:url atIndex:2];
    [invocation rac_setArgument:parameters atIndex:3];
    [invocation rac_setArgument:success atIndex:4];
    [invocation rac_setArgument:failure atIndex:5];

    [invocation invoke];
  }];
}

Answer 2

你见过Reactive AFNetworking吗？它应该解决你的问题

Answer 3

修改：

以下代码根本不起作用。

我从Reactive AFNetworking借了一些代码，代码如下是我的解决方案：

- (void)GET:(NSString *)URL parameters:(NSDictionary *)parameters { return [self signal_requestURL:URL method:@"PUT" parameters:parameters]; } - (RACSignal *)signal_requestURL:(NSString *)URL method:(NSString *)method parameters:(NSDictionary *)parameters { AFHTTPRequestSerializer *serializer = [AFJSONRequestSerializer serializer]; NSURLRequest *request = [serializer requestWithMethod:method URLString:URL parameters:parameters error:NULL]; RACReplaySubject *subject = [RACReplaySubject replaySubjectWithCapacity:1]; [self.manager HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation *operation, NSDictionary *responseObject) { [subject sendNext:responseObject]; [subject sendCompleted]; } failure:^(AFHTTPRequestOperation *operation, NSError *error) { [subject sendError:error]; }]; return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [subject subscribe:subscriber]; return nil; }]; }

使用AFNetworking和ReactiveCocoa时如何重构几乎相同的逻辑？

3 个答案: