1.RAC+MVVM

RAC_MVVM.h
#import <UIKit/UIKit.h>
@interface RAC_MVVM : UIViewController
@end

RAC_MVVM.m
#import "RAC_MVVM.h"
#import <ReactiveObjC.h>
#import "loginViewModel.h"

@interface RAC_MVVM ()
@property (nonatomic,strong)UITextField  *accountF;
@property (nonatomic,strong)UITextField  *pwdF;
@property (nonatomic,strong)UIButton  *loginBtn;
@property(nonatomic, strong)loginViewModel *loginVM;
@end

@implementation RAC_MVVM

- (loginViewModel *)loginVM {
    if (!_loginVM) {
        _loginVM = [[loginViewModel alloc] init];
    }
    return _loginVM;
}


- (void)viewDidLoad {
    [super viewDidLoad];
    self.accountF = [[UITextField alloc]initWithFrame:CGRectMake(10, 100, 200, 40)];
    self.accountF.borderStyle =  UITextBorderStyleRoundedRect;
    [self.view addSubview:self.accountF];
    self.accountF.placeholder = @"账号输入";
    self.pwdF = [[UITextField alloc]initWithFrame:CGRectMake(10, 200, 200, 40)];
    [self.view addSubview:self.pwdF];
    self.pwdF.borderStyle =  UITextBorderStyleRoundedRect;
    self.pwdF.placeholder = @"密码输入";
    self.loginBtn = [[UIButton alloc]initWithFrame:CGRectMake(10, 300, 200, 40)];
    [self.view addSubview:self.loginBtn];
    
    [self bindViewModel];
    [self loginEvent];
}

- (void)bindViewModel {
    // 1.给视图模型的账号和密码绑定信号
    RAC(self.loginVM, account) = self.accountF.rac_textSignal;
    RAC(self.loginVM, pwd) = self.pwdF.rac_textSignal;
}


- (void)loginEvent {
     @weakify(self);
    // 1.处理文本框业务逻辑--- 设置按钮是否能点击
    RAC(self.loginBtn, enabled) = self.loginVM.loginEnableSignal;
    
    [RACObserve(self.loginBtn, enabled) subscribeNext:^(id  _Nullable x) {
        @strongify(self);
        if([x boolValue]==1){
            [self.loginBtn setTitle:@"可以点" forState:UIControlStateNormal];
            [self.loginBtn setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
            [self.loginBtn setBackgroundColor:[UIColor greenColor]];
        }else{
            [self.loginBtn setTitle:@"不可以点" forState:UIControlStateNormal];
            [self.loginBtn setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
            [self.loginBtn setBackgroundColor:[UIColor greenColor]];
        }
    }];
    // 2.监听登录按钮点击
    [[self.loginBtn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {
        @strongify(self);
        NSLog(@"点击登录按钮");
        // 处理登录事件
        [self.loginVM.loginCommand execute:nil];
    }];

}

-(void)dealloc{
    NSLog(@"%s",__FUNCTION__);
}

@end


loginViewModel.h
#import <Foundation/Foundation.h>
#import <ReactiveObjC.h>

@interface loginViewModel : NSObject
// 处理按钮是否允许点击
@property(nonatomic, strong, readonly) RACSignal *loginEnableSignal;
/**保存登录界面的账号和密码*/
@property(nonatomic, strong) NSString *account;
@property(nonatomic, strong) NSString *pwd;
//登录按钮的命令
@property(nonatomic, strong, readonly) RACCommand *loginCommand;
@end

loginViewModel.m
#import "loginViewModel.h"
#import <SVProgressHUD.h>

@implementation loginViewModel
-(instancetype)init{
    if (self = [super init]) {
        [self setup];
    }
    return self;
}

- (void)setup {
    // 1. 处理登录点击的信号
    _loginEnableSignal = [RACSignal combineLatest:@[RACObserve(self, account), RACObserve(self, pwd)] reduce:^id(NSString *account, NSString *pwd){
        return @(account.length && pwd.length);
    }];
    
    // 2.处理登录点击命令
    _loginCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
        // block调用：执行命令就会调用
        // block作用：事件处理
        // 发送登录请求
        NSLog(@"发送登录请求");
        return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)),dispatch_get_main_queue(), ^{
                // 发送数据
                [subscriber sendNext:@"发送登录的数据"];
                [subscriber sendCompleted]; // 一定要记得写
            });
             return nil;
            }];
    }];
    
    // 3.处理登录的请求返回的结果
    // 创建登录命令
    // 获取命令中的信号源
    [_loginCommand.executionSignals.switchToLatest subscribeNext:^(id x) {
        NSLog(@"%@", x);
    }];
    
    // 4.处理登录执行过程
    [[_loginCommand.executing skip:1] subscribeNext:^(id x) { // 跳过第一步（"没有执行"这步）
        if ([x boolValue] == YES) {
            NSLog(@"--正在执行");
            // 显示蒙版
             [SVProgressHUD show];
        }else { //执行完成
            NSLog(@"执行完成");
            // 取消蒙版
             [SVProgressHUD dismiss];
         }
    }];
}
@end

2.RAC+MVVM-网络请求

RAC_MVVM_2.m
#import "RAC_MVVM_2.h"
#import "RequestViewModel.h"
#import <ReactiveObjC.h>

@interface RAC_MVVM_2()
//请求视图模型
@property(nonatomic, strong)RequestViewModel *requestVM;
@end

@implementation RAC_MVVM_2

- (RequestViewModel *)requestVM {
    if (!_requestVM) {
        _requestVM = [[RequestViewModel alloc] init];
    }
    return _requestVM;
}

-(void)viewDidLoad{
    [super viewDidLoad];
    RACSignal *signal = [self.requestVM.requestCommand execute:nil];
    [signal subscribeNext:^(id x) {
        NSLog(@"%@",x);
    }];
    
}
@end

RequestViewModel.h
#import <Foundation/Foundation.h>
#import <ReactiveObjC.h>

@interface RequestViewModel : NSObject
@property(nonatomic, strong, readonly)RACCommand *requestCommand;
@end

RequestViewModel.m
#import "RequestViewModel.h"
#import <AFNetworking.h>

@implementation RequestViewModel
- (instancetype)init {
    if (self = [super init]) {
        [self setup];
    }
    return self;
}
- (void)setup {
    _requestCommand = [[RACCommand alloc] initWithSignalBlock:^RACSignal *(id input) {
        // 执行命令
        // 发送请求
        // 创建信号 把发送请求的代码包装到信号里面。
        RACSignal *signal = [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
            AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
            [manager GET:@"https://api.douban.com/v2/book/search" parameters:@{@"q":@"帅哥"} progress:^(NSProgress * _Nonnull downloadProgress) {
                
            } success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) {
                // 请求成功的时候调用
                NSArray *dictArr = responseObject[@"books"];
                // 遍历books字典数组，将其映射为模型数组
                NSArray *modelArr = [[dictArr.rac_sequence map:^id(id value) {
                    return [[NSObject alloc] init];
                }] array];
                [subscriber sendNext:modelArr];
            } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
            }];
            return nil;
        }];
        return signal;// 模型数组
    }];
}
@end

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