RAC的冷信号 -> 热信号

冷信号 -> 热信号：

// 冷信号 -> 热信号
RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
    [subscriber sendNext:@1];
    [subscriber sendNext:@11];
    [subscriber sendNext:@111];
    [subscriber sendNext:@1111];
    [subscriber sendCompleted];
    return [RACDisposable disposableWithBlock:^{
        NSLog(@"signalA1完成");
    }];
}];

RACSignal *signalB = [[signalA map:^id(id value) {
    return [[RACSignal return:value] delay:1];
}] concat];

RACSubject *speaker = [RACSubject subject];
// 冷信号转变成一个热信号
[signalB subscribe:speaker];
[speaker subscribeNext:^(id x) {
    NSLog(@"1:%@",x);
}];
[speaker subscribeNext:^(id x) {
    NSLog(@"2:%@",x);
}];
[speaker subscribeNext:^(id x) {
    NSLog(@"3:%@",x);
}];

[speaker sendNext:@22];
[speaker sendNext:@222];
// 结果：

2021-04-21 20:13:59.725736+0800 XXXXXX[2785:462147] 1:22

2021-04-21 20:13:59.725775+0800 XXXXXX[2785:462147] 2:22

2021-04-21 20:13:59.725786+0800 XXXXXX[2785:462147] 3:22

2021-04-21 20:13:59.725797+0800 XXXXXX[2785:462147] 1:222

2021-04-21 20:13:59.725806+0800 XXXXXX[2785:462147] 2:222

2021-04-21 20:13:59.725814+0800 XXXXXX[2785:462147] 3:222

2021-04-21 20:14:00.743432+0800 XXXXXX[2785:462147] 1:1

2021-04-21 20:14:00.743628+0800 XXXXXX[2785:462147] 2:1

2021-04-21 20:14:00.743745+0800 XXXXXX[2785:462147] 3:1

2021-04-21 20:14:01.840378+0800 XXXXXX[2785:462147] 1:11

2021-04-21 20:14:01.840572+0800 XXXXXX[2785:462147] 2:11

2021-04-21 20:14:01.840685+0800 XXXXXX[2785:462147] 3:11

2021-04-21 20:14:02.842987+0800 XXXXXX[2785:462147] 1:111

2021-04-21 20:14:02.843184+0800 XXXXXX[2785:462147] 2:111

2021-04-21 20:14:02.843298+0800 XXXXXX[2785:462147] 3:111

2021-04-21 20:14:03.885937+0800 XXXXXX[2785:462147] 1:1111

2021-04-21 20:14:03.886134+0800 XXXXXX[2785:462147] 2:1111

2021-04-21 20:14:03.886256+0800 XXXXXX[2785:462147] 3:1111

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