ReactiveCocoa：

首先使用Pod前，先查看一下版本信息，选择好需要的版本，特别是使用objc时候，不需要选择太新的，主要是已经不再更新了，在这里，我选择的是一个2.0版本，版本特性在大多数博文中都有详细介绍，我就不一一列举了。

PodFIle文件设置：

当然，只是简单的

也是可以的，我这样写无非是万无一失的，之后Pod update等待下载完成就可以。
打开工程文件夹中由pod新生成的workplace，这样就可以利用：

将RAC库导入到工程中去了。

在这之后，我们可以简单进行测试一下一些特性：

简单的信号订阅，这样在输入框中输入的内容就会被实时捕获：

当然你还可以进行对其他的特性进行简单测试：如信号合并等

在这里我实现了一个简单的登录界面demo：
1、当帐号密码不满足条件时输入框显示黄色，同时按钮无效
2、当帐号密码满足条件，输入框变为白色，按钮生效

我简单将一些实现的代码贴一下，方便大家试试：

//
// ViewController.m
// Test
//
// Created by 林之杰 on 15/11/18.
// Copyright ? 2015年 林之杰. All rights reserved.
//

#import "ViewController.h"
#import "RWDummySignInService.h"
#import <ReactiveCocoa/ReactiveCocoa.h>
@interface ViewController ()
@property (strong,nonatomic) IBOutlet UITextField *newa;
@property (strong,nonatomic) IBOutlet UITextField *usrname;
@property (strong,nonatomic) IBOutlet UITextField *password;
@property (strong,nonatomic) IBOutlet UIButton *button;
@property (strong,nonatomic) RWDummySignInService *signInService;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.signInService = [RWDummySignInService new];


// [self.usrname.rac_textSignal subscribeNext:^(id text) {
// NSLog(@"%@",text);
// }];
// 
// 
// 
    RACSignal *signal = [self createSignal];
    [signal subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];


// [[self.newa.rac_textSignal filter:^BOOL(NSString *text) {
// return text.length > 3;
// }] subscribeNext:^(id x) {
// NSLog(@"%@",x);
// }];

// [[[self.newa.rac_textSignal map:^id(NSString *text) {
// return @(text.length);
// }] filter:^BOOL(NSString *length) {
// return [length integerValue] >3;
// }] subscribeNext:^(id x) {
// NSLog(@"%@",x);
// }];
    RACSignal * a = [self.usrname.rac_textSignal map:^id(NSString *text) {
        return @([self isValidUsername:text]);
    }];
    RACSignal * b = [self.password.rac_textSignal map:^id(NSString *text) {
        return @([self isValidPassword:text]);
    }];
   RAC(self.usrname,backgroundColor) =
    [a map:^id(NSNumber *usernameValid) {
        return [usernameValid boolValue]?[UIColor whiteColor]:[UIColor yellowColor];
    }];
    RAC(self.password,backgroundColor) =
    [b map:^id(NSNumber *passwordValid) {
        return [passwordValid boolValue]?[UIColor whiteColor]:[UIColor yellowColor];
    }];

    RACSignal *signUpActivateSignal =
    [RACSignal combineLatest:@[a,b] reduce:^id(NSNumber *username,NSNumber *password){
        return @([username boolValue] && [password boolValue]);
    }];

    [signUpActivateSignal subscribeNext:^(NSNumber *signupActive) {
        self.button.enabled = [signupActive boolValue];
    }];


    [[[self.button rac_signalForControlEvents:UIControlEventTouchUpInside] flattenMap:^id(id value) {
        return [self singInSignal];
    }] subscribeNext:^(id x) {
        NSLog(@"Sign in result:%@",x);
    }];


    // Do any additional setup after loading the view,typically from a nib.
}
- (BOOL)isValidUsername:(NSString *)username {
    return username.length > 3;
}

- (BOOL)isValidPassword:(NSString *)password {
    return password.length > 3;
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (RACSignal*) createSignal{
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        NSLog(@"signal is created");
        return nil;
    }];
}

-(RACSignal *)singInSignal {
    return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
        [self.signInService
         signInWithUsername:self.usrname.text
                   password:self.password.text
                   complete:^(BOOL success) {
             [subscriber sendNext:@(success)];
             [subscriber sendCompleted];

                   }];
        return  nil;
         }];
}

@end

好了，讲到这里，更多高级特性请移步以下链接学习：
? http://spin.atomicobject.com/2014/02/03/objective-c-delegate-pattern/
? http://blog.bignerdranch.com/4549-data-driven-ios-development-reactivecocoa/
? http://en.wikipedia.org/wiki/Functional_reactive_programming
? http://www.teehanlax.com/blog/reactivecocoa/
? http://www.teehanlax.com/blog/getting-started-with-reactivecocoa/
? http://nshipster.com/reactivecocoa/
? http://cocoasamurai.blogspot.com/2013/03/basic-mvvm-with-reactivecocoa.html
? http://iiiyu.com/2013/09/11/learning-ios-notes-twenty-eight/
? https://speakerdeck.com/andrewsardone/reactivecocoa-at-mobidevday-2013
? http://msdn.microsoft.com/en-us/library/hh848246.aspx
? http://www.itiger.me/?p=38
? http://blog.leezhong.com/ios/2013/12/27/reactivecocoa-2.html
? https://github.com/ReactiveCocoa/ReactiveCocoa/blob/master/Documentation/FrameworkOverview.md
? http://www.haskell.org/haskellwiki/Functional_Reactive_Programming
? http://blog.zhaojie.me/2009/09/functional-reactive-programming-for-csharp.html