-(void)_test4{
    
    ///RAC combineLatest和merge
    // combineLatest只有当两个信号都发送了 订阅者才能收到信息 结果一次收到 结果是数组
    // merge只要有一个发送了就能收到 结果一条一条收到
    
    //    RACSubject *baseSubjectTwo = [RACSubject subject];
    //    RACSubject *baseSignal = [RACSubject subject];
    //    [[RACSignal combineLatest:@[baseSignal,baseSubjectTwo]]subscribeNext:^(id x) {
    //        NSLog(@"接收到两个信号发来的信息%@",x);
    //    }];
    //
    //    [baseSignal sendNext:@"baseSignal发送了信号"];
    //    [baseSubjectTwo sendNext:@"baseSubjectTwo发送了信号"];
    
    
    RACSubject *baseSubject4 = [RACSubject subject];
    RACSubject *baseSignal3 = [RACSubject subject];
    [[RACSignal merge:@[baseSignal3,baseSubject4]]subscribeNext:^(id x) {
        NSLog(@"接收到3,4信号发来的信息%@",x);
    }];
    
    [baseSignal3 sendNext:@"baseSignal3发送了信号"];
    [baseSubject4 sendNext:@"baseSubject4发送了信号"];
    
    
    
}