RAC其他

RACScheduler:RAC中的队列，用GCD封装的。 RACUnit :表⽰stream不包含有意义的值,也就是看到这个，可以直接理解为nil. RACEvent: 把数据包装成信号事件(signal event)。它主要通过RACSignal的-materialize来使用。

self.navigationItem.rightBarButtonItem.rac_command = self.viewModel.loginCommand;
    
    [[self.viewModel.loginCommand.executionSignals flattenMap:^(RACSignal *execution) {
        // Sends RACUnit after the execution completes.
        return [[execution ignoreValues] concat:[RACSignal return:RACUnit.defaultUnit]];
    }] subscribeNext:^(id _) {
        @strongify(self);
        [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
    }];
    [self.viewModel.loginCommand.errors subscribeNext:^(id x) {
        NSLog(@"Login error: %@", x);
    }];




self.navigationItem.leftBarButtonItem.rac_command = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
        return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            @strongify(self);
            
            [self.presentingViewController dismissViewControllerAnimated:YES completion:^{
                [subscriber sendCompleted];
            }];
            
            return nil;
        }];
    }];

concat连接：

RACSignal *signalA = [RACSignal createSignal:^RACDisposable *(idsubscriber) {
        [subscriber sendNext:@"我恋爱啦"];
        [subscriber sendCompleted];
        return nil;
    }];
    RACSignal *signalB = [RACSignal createSignal:^RACDisposable *(idsubscriber) {
        [subscriber sendNext:@"我结婚啦"];
        [subscriber sendCompleted];
        return nil;
    }];
    [[signalA concat:signalB] subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];

flattenMap:

[[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        NSLog(@"打蛋液");
        [subscriber sendNext:@"蛋液"];
        [subscriber sendCompleted];
        return nil;
    }] flattenMap:^RACStream *(NSString* value) {
        return [RACSignal createSignal:^RACDisposable *(idsubscriber) {
            NSLog(@"把%@倒进锅里面煎",value);
            [subscriber sendNext:@"煎蛋"];
            [subscriber sendCompleted];
            return nil;
        }];
    }] flattenMap:^RACStream *(NSString* value) {
        return [RACSignal createSignal:^RACDisposable *(idsubscriber) {
            NSLog(@"把%@装到盘里", value);
            [subscriber sendNext:@"上菜"];
            [subscriber sendCompleted];
            return nil;
        }];
    }] subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];

then:

[[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        NSLog(@"打开冰箱门");
        [subscriber sendCompleted];
        return nil;
    }] then:^RACSignal *{
       return [RACSignal createSignal:^RACDisposable *(idsubscriber) {
           NSLog(@"把大象塞进冰箱");
           [subscriber sendCompleted];
           return nil;
       }];
    }] then:^RACSignal *{
        return [RACSignal createSignal:^RACDisposable *(idsubscriber) {
            NSLog(@"关上冰箱门");
            [subscriber sendCompleted];
            return nil;
        }];
    }] subscribeCompleted:^{
        NSLog(@"把大象塞进冰箱了");
    }];

delay延迟:

[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        NSLog(@"等等我，我还有10秒钟就到了");
        [subscriber sendNext:nil];
        [subscriber sendCompleted];
        return nil;
    }] delay:10] subscribeNext:^(id x) {
        NSLog(@"我到了");
    }];
interval定时：
 [[RACSignal interval:60*60*8 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(id x) {
        NSLog(@"吃药");
    }];

timeout超时：

[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        [[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
            NSLog(@"我快到了");
            [subscriber sendNext:nil];
            [subscriber sendCompleted];
            return nil;
        }] delay:60*70] subscribeNext:^(id x) {
            [subscriber sendNext:nil];
            [subscriber sendCompleted];
        }];
        return nil;
    }] timeout:60*60 onScheduler:[RACScheduler mainThreadScheduler]] subscribeError:^(NSError *error) {
        NSLog(@"等了你一个小时了，你还没来，我走了");
    }];

retry重试：

__block int failedCount = 0;
    [[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        if (failedCount < 100) {
            failedCount++;
            NSLog(@"我失败了");
            [subscriber sendError:nil];
        }else{
            NSLog(@"经历了数百次失败后");
            [subscriber sendNext:nil];
        }
        return nil;
    }] retry] subscribeNext:^(id x) {
        NSLog(@"终于成功了");
    }];

throttle节流：

[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        [subscriber sendNext:@"旅客A"];
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [subscriber sendNext:@"旅客B"];
        });
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [subscriber sendNext:@"旅客C"];
            [subscriber sendNext:@"旅客D"];
            [subscriber sendNext:@"旅客E"];
        });
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [subscriber sendNext:@"旅客F"];
        });
        return nil;
    }] throttle:1] subscribeNext:^(id x) {
        NSLog(@"%@通过了",x);
    }];

2015-08-16 22:08:45.677 Test[2618:83764] 旅客A  
2015-08-16 22:08:46.737 Test[2618:83764] 旅客B  
2015-08-16 22:08:47.822 Test[2618:83764] 旅客E  
2015-08-16 22:08:48.920 Test[2618:83764] 旅客F

takeUntil条件：

[[[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        [[RACSignal interval:1 onScheduler:[RACScheduler mainThreadScheduler]] subscribeNext:^(id x) {
            [subscriber sendNext:@"直到世界的尽头才能把我们分开"];
        }];
        return nil;
    }] takeUntil:[RACSignal createSignal:^RACDisposable *(idsubscriber) {
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            NSLog(@"世界的尽头到了");
            [subscriber sendNext:@"世界的尽头到了"];
        });
        return nil;
    }]] subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];