Objective c 反应链接网络操作失败
我尝试使用ReactiveCocoa进行网络操作链接,但失败了。我不知道我的代码出了什么问题Objective c 反应链接网络操作失败,objective-c,parse-platform,reactive-cocoa,Objective C,Parse Platform,Reactive Cocoa,我尝试使用ReactiveCocoa进行网络操作链接,但失败了。我不知道我的代码出了什么问题 - (RACSignal *)pg_findObjectsInBackground { return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) { [self findObjectsInBackgroundWithBlock:^(NSArray *objects, N
- (RACSignal *)pg_findObjectsInBackground {
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[self findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (error) {
[subscriber sendError:error];
return;
}
[subscriber sendNext:objects];
[subscriber sendCompleted];
}];
return [RACDisposable disposableWithBlock:^{
[self cancel];
}];
}];
}
- (RACSignal *)pg_countObjectsInBackground {
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
[self countObjectsInBackgroundWithBlock:^(int number, NSError *error) {
if (error) {
[subscriber sendError:error];
return;
}
[subscriber sendNext:@(number)];
[subscriber sendCompleted];
}];
return [RACDisposable disposableWithBlock:^{
[self cancel];
}];
}];
}
第一个请求成功。但是,我一返回[self.query pg_findObjectsInBackground],它就直接转到disposableWithBlock。因为在计数和查找对象操作中使用相同的PFQuery对象,所以从FlattMap方法返回时,查询将被取消。扁平地图订阅了新的信号,这是相同的信号,我相信这会导致一次性武器开火。一个简单的解决方案是构造一个新的PFQuery并在flattmap块中返回它 我假设您正在使用Parse,如果您正在使用,则应该标记它
__block NSError *_error;
@weakify(self)
[[[self.query pg_countObjectsInBackground]flattenMap:^RACStream *(NSNumber *count) {
@strongify(self)
self.totalCount = [count integerValue];
// Second, fetch experiences
self.query.limit = self.pageSize;
self.query.skip = self.pageSize * self.currentPage;
return [self.query pg_findObjectsInBackground];
}]subscribeNext:^(NSArray *experiences) {
@strongify(self)
[self.experiences removeAllObjects];
[self.experiences addObjectsFromArray:experiences];
} error:^(NSError *error) {
_error = error;
} completed:^{
@strongify(self)
if (finishBlock) {
finishBlock(self, _error);
}
}];