RACSignal的combineLatest和merge（类似信号量机制）

combineLatest

combineLatest只有当全部信号都发送了，订阅者才能收到信息

    RACSubject *subject_1 = [RACSubject subject];
    RACSubject *subject_2 = [RACSubject subject];
    
    [[RACSignal combineLatest:@[subject_1,subject_2]]subscribeNext:^(id x) {
    	NSLog(@"接收到全部信息%@",x);
    }];
    
    [subject_1 sendNext:@"subject_1发送信号"];
    [subject_2 sendNext:@"subject_2发送信号"];

merge

merge只要有一个发送了就能收到，结果一条一条收到

    RACSubject *subject_1 = [RACSubject subject];
    RACSubject *subject_2 = [RACSubject subject];
    [[RACSignal merge:@[subject_1,subject_2]]subscribeNext:^(id x) {
        NSLog(@"收到信息%@",x);
    }];
    
    [subject_1 sendNext:@"subject_1发送信号"];
    [subject_2 sendNext:@"subject_2发送信号"];

参考资料

美团技术团队的RACSignal的Subscription深入分析

最后

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