不用太多浮夸繁雜的介紹，要的就是會(huì)用。在使用中慢慢體會(huì)它帶給我們開發(fā)的便利吧。你要的全在此。

//1 RACSignal
    RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        
        NSLog(@"發(fā)送請(qǐng)求******");
        [subscriber sendNext:@1];
        [subscriber sendCompleted];
        
        return [RACDisposable disposableWithBlock:^{
            NSLog(@"RACDisposable");
        }];
    }];
    
    [signal subscribeNext:^(id x) {
       NSLog(@"每注冊(cè)一次就會(huì)發(fā)送一次請(qǐng)求 接收到數(shù)據(jù)1:%@",x);
    }];
    [signal subscribeNext:^(id x) {
        NSLog(@"每注冊(cè)一次就會(huì)發(fā)送一次請(qǐng)求 接收到數(shù)據(jù)2:%@",x);
    }];

    //2 RACMulticastConnection 可防止多次執(zhí)行發(fā)送請(qǐng)求sendNext
    RACMulticastConnection *connection = [signal publish];
    [connection.signal subscribeNext:^(id x) {
        NSLog(@"訂閱者1");
    }];
    [connection.signal subscribeNext:^(id x) {
        NSLog(@"訂閱者2");
    }];
    [connection connect];


    //3 RACSubject 是 RACSignal子類 sendNext會(huì)遍歷所有subscriber調(diào)用其sendNext
    RACSubject *subject = [RACSubject subject];
    [subject subscribeNext:^(id x) {
        NSLog(@"RACSubject發(fā)送前第一個(gè)訂閱者*****%@",x);
    }];
    [subject subscribeNext:^(id x) {
        NSLog(@"RACSubject發(fā)送前第二個(gè)訂閱者*****%@",x);
    }];
    [subject sendNext:@3];
    
    //4 RACReplaySubject 是 RACSubject 子類
    RACReplaySubject *replaySubject = [RACReplaySubject subject];
    [replaySubject sendNext:@5];
    [replaySubject subscribeNext:^(id x) {
        NSLog(@"RACReplaySubject 1 發(fā)送后我才注冊(cè)***%@",x);
    }];
    [replaySubject subscribeNext:^(id x) {
        NSLog(@"RACReplaySubject 2 發(fā)送后我才注冊(cè)***%@",x);
    }];

    //5 RACSequence處理了隊(duì)列或字典鍵值對(duì)（數(shù)組和字典中的元素 signal出的值：字典包裝了Tuple元組 數(shù)組是值本身)
    NSArray *numbers = @[@2, @5, @8,@10];
    [numbers.rac_sequence.signal subscribeNext:^(id x) {
        NSLog(@"*****數(shù)組中的值是***%@",x);
    }];
    
    NSArray *mapNewArray = [[numbers.rac_sequence map:^id(id value) {
        return [NSString stringWithFormat:@"Map reslut value**%@",value];
    }] array];
    NSLog(@"Map出的新Array****%@", mapNewArray);
    
    NSDictionary *dictions = @{@"name":@"Bobie", @"age":@19, @"city":@"Robbin", @"number":@39};
    [dictions.rac_sequence.signal subscribeNext:^(id x) {
        RACTupleUnpack(NSString *nameValue, NSString *ageValue) = x;
        NSLog(@"***字典中的鍵值對(duì)是****%@****%@",nameValue,ageValue);
    }];
    
   //6 RACCommand
    _commond = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
        
        //必須要返回信號(hào) 如無則返回空信號(hào)
        // return [RACSignal empty];
        
        return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            
            [subscriber sendNext:@"發(fā)送請(qǐng)求"];
            [subscriber sendCompleted];
            
            return [RACDisposable disposableWithBlock:^{
                
            }];
        }];
    }];
    
    [_commond.executionSignals subscribeNext:^(id x) {
        
        NSLog(@"***subscribeNext**out***%@",x);
        
        [x subscribeNext:^(id x) {
            NSLog(@"*****subscribeNext**in**%@",x);
        }];
    }];
    [_commond.executionSignals.switchToLatest subscribeNext:^(id x) {
        NSLog(@"**switchToLatest******%@",x);
    }];
    
    [[_commond.executing skip:1] subscribeNext:^(id x) {
        if ([x boolValue] == YES) {
            NSLog(@"正在執(zhí)行");
        }else{
            NSLog(@"執(zhí)行完成");
        }
    }];
    
    [_commond execute:@6];
    _firstBtn.rac_command = _commond;
    
 //具體看下commond的示例：executionSignals是RACCommand的signal，每當(dāng)command開始執(zhí)行時(shí)next:，其參數(shù)是由command創(chuàng)建的signal，所以這個(gè)executionSignals是一個(gè)值為signal的signal。在command每次開始執(zhí)行時(shí)得到一個(gè)包含字符串值的signal：
    RACSignal *startSignal = [_commond.executionSignals map:^id(RACSignal *value) {
        return NSLocalizedString(@"發(fā)送請(qǐng)求字符串", nil);
    }];
    
    //如果我們想用純粹的函數(shù)在command執(zhí)行完成后得到一個(gè)包含字符串的signal。flattenMap:方法在command執(zhí)行時(shí)，會(huì)調(diào)用block并傳入subscribeSignal，這個(gè)block會(huì)返回一個(gè)新的signal，它的值就在這個(gè)要返回的signal中。materialize會(huì)將一個(gè)signal轉(zhuǎn)換為RACEvent信號(hào)（將一個(gè)signal的next:complete和error:消息轉(zhuǎn)換為RACEvent實(shí)例的next:的值）。接下來我們就過濾這些事件，只留下RACEventTypeCompleted完成事件，并將其map成一個(gè)字符串值。
    RACSignal *completeSignal = [_commond.executionSignals flattenMap:^RACStream *(RACSignal *value) {
        
        return [[[value materialize] filter:^BOOL(RACEvent *value) {
           return value.eventType == RACEventTypeCompleted;
        }] map:^id(id value) {
            return NSLocalizedString(@"Thanks", nil);
        }];
    }];
    
    //效果等同于上面FlattenMap作用
    @weakify(self);
    [_commond.executionSignals subscribeNext:^(RACSignal*subscribeSignal) {
        
        [subscribeSignal subscribeCompleted:^{
            
            @strongify(self);
            self.myString= @"Thanks";
        }];   
    }];
    
    //executionSignals屬性，這個(gè)signals不會(huì)發(fā)送了error事件，而是由errors這個(gè)屬性來發(fā)送的。在一個(gè)command的執(zhí)行期間，如果一個(gè)signal發(fā)送了error，這會(huì)被signals當(dāng)成一個(gè)next:事件發(fā)送，而errors屬性則會(huì)發(fā)送這個(gè)錯(cuò)誤信息。errors屬性不會(huì)發(fā)送error:事件。我們很容易就能將錯(cuò)誤信息map成一個(gè)字符串消息
    RACSignal *failSignal = [[_commond.errors subscribeOn:[RACScheduler mainThreadScheduler]] map:^id(NSError *error){
        return NSLocalizedString(@"FailError", nil);
    }];
    
    //7 將這個(gè)3個(gè)signals合并成一個(gè)signal，并將其綁定到self的myString屬性上
    RAC(self, myString) = [RACSignal merge:@[startSignal, completeSignal, failSignal]];
   
   //8
    @weakify(self);
    
    //監(jiān)聽某個(gè)方法調(diào)用 表示只要self調(diào)用btnOnclickedFirst:,就會(huì)發(fā)出信號(hào)，訂閱就好了。
    [[self rac_signalForSelector:@selector(btnOnclickedFirst:)] subscribeNext:^(id x) {
        NSLog(@"**************3434343434");
    }];
    
    //監(jiān)聽某個(gè)屬性改變?yōu)樾轮?    [[self rac_valuesAndChangesForKeyPath:@"mypoint" options:NSKeyValueObservingOptionNew observer:nil] subscribeNext:^(id x) {
        NSLog(@"*****mypoint 新值為***%@",x);
    }];
    
    //監(jiān)聽某個(gè)屬性變化
    [RACObserve(self, myString) subscribeNext:^(id x) {
        NSLog(@"mystring 有變化 我知道了");
    }];
    
    //監(jiān)聽按鈕動(dòng)作
    [[_firstBtn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
        NSLog(@"監(jiān)聽按鈕了");
    }];
    
    
    //監(jiān)聽輸入框輸入
    [_firstTextField.rac_textSignal subscribeNext:^(id x) {
        
        @strongify(self);
        NSLog(@"文字改變了%@",x);
        NSLog(@"********改變輸入框文字即改變myString**%@", self.myString);
    }];
    
    //處理多個(gè)請(qǐng)求，都返回結(jié)果的時(shí)候，統(tǒng)一做處理.當(dāng)signalOne和signalTwo都至少sendNext過一次，接下來只要其中任意一個(gè)signal有了新的內(nèi)容，updateMyUI:dateTwo:這個(gè)方法就會(huì)自動(dòng)被觸發(fā)
    RACSignal *signalOne = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        [subscriber sendNext:@"第一個(gè)請(qǐng)求發(fā)送"];
        return [RACDisposable disposableWithBlock:^{
        }];
    }];
    RACSignal *signalTwo = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        [subscriber sendNext:@"第二個(gè)請(qǐng)求發(fā)送"];
        return [RACDisposable disposableWithBlock:^{
        }];
    }];
    [self rac_liftSelector:@selector(updateMyUI:dateTwo:) withSignalsFromArray:@[signalOne, signalTwo]];
    
    //給某個(gè)對(duì)象的某個(gè)屬性綁定
    RAC(self, myString) = _firstTextField.rac_textSignal;
    
    //監(jiān)聽通知
    [[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardWillShowNotification object:nil] subscribeNext:^(id x) {
        NSLog(@"系統(tǒng)通知被監(jiān)聽");
    }];