RAC的Collect操作

数量操作——减少——Collect：

// 数量操作——减少——Collect：将收集的信号，变成一个数组：汇集
RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
  [subscriber sendNext:@1];
  [subscriber sendNext:@2];
  [subscriber sendNext:@4];
  [subscriber sendCompleted];
  return [RACDisposable disposableWithBlock:^{
    NSLog(@"完成");
  }];
}];

RACSignal *signalB = [signalA collect];

[[signalB subscribeNext:^(id x) {
  NSLog(@"subscribeNext:%@",x);
}] dispose];

2021-04-15 11:32:12.738358+0800 XXXXXX[3509:1044742] subscribeNext:(

1,

2,

4

)

2021-04-15 11:32:12.739148+0800 XXXXXX[3509:1044742] 完成