RAC MVVM demo

https://www.jianshu.com/p/e34a86642d62

Screen Shot 2018-11-02 at 7.11.35 PM.png

VM中 获得btn是否能enable Signal

  self.loginButtonEnableSignal = [RACSignal combineLatest:@[RACObserve(self, username), RACObserve(self, password)] reduce:^id(NSString *username, NSString *password){
        return @(username.length && password.length);
    }];

VC

//根据signal设置btn 的enable
- (void)loginButtonEnable {
    RAC(self.loginViewModel, username) = _loginView.usernameTextField.rac_textSignal;
    RAC(self.loginViewModel, password) = _loginView.passwordTextField.rac_textSignal;
    RAC(self.loginView.loginButton, enabled) = _loginViewModel.loginButtonEnableSignal;
    

}

//监听按钮点击 在vm 中处理网络请求
- (void)loginButtonAction {
    [[_loginView.loginButton rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(__kindof UIControl * _Nullable x) {
        [self.loginViewModel.loginCommad execute:nil];
    }];
}

VM 处理网络请求

 self.loginCommad = [[RACCommand alloc] initWithSignalBlock:^RACSignal * _Nonnull(id input) {
        return [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
//            NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:@"http://120.25.226.186:32812/login"]];
//            request.HTTPMethod = @"POST";
//            NSString *paramString = [NSString stringWithFormat:@"username=%@&pwd=%@&type=JSON", self.username, self.password];
//            NSData *paramData = [paramString dataUsingEncoding:NSUTF8StringEncoding];
//            request.HTTPBody = paramData;
//            [[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
//                NSDictionary *resultDictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:NULL];
//                [subscriber sendNext:resultDictionary];
//                /****************** -------- 发送完成这一步很重要, 不然后面的无法信号无法执行 -------- ******************/
//                [subscriber sendCompleted];
//            }] resume];
            
            
            NSDictionary *resultDictionary = @{
                                               @"value":@"zack",
                                               @"book":@"quck"
                                               
                                               };
            [subscriber sendNext:resultDictionary];
            /****************** -------- 发送完成这一步很重要, 不然后面的无法信号无法执行 -------- ******************/
            [subscriber sendCompleted];
            
            return nil;
        }];
    }];


//根据服务器返回结果做出相应的处理
 [self.loginCommad.executionSignals.switchToLatest subscribeNext:^(NSDictionary *x) {
//        if ([x.allKeys.lastObject isEqualToString:@"success"]) {
            [SVProgressHUD showSuccessWithStatus:@"登录成功"];
            [SVProgressHUD dismissWithDelay:1 completion:^{
                YFFirstPageViewController *firstPageVC = [[YFFirstPageViewController alloc] init];
                [UIView animateWithDuration:1 animations:^{
                    [UIApplication sharedApplication].keyWindow.rootViewController = firstPageVC;
                }];
            }];
//        }else {
//            [SVProgressHUD showErrorWithStatus:@"登录失败"];
//            [SVProgressHUD dismissWithDelay:1];
//        }
    }];
    
    [[self.loginCommad.executing skip:1] subscribeNext:^(NSNumber * _Nullable x) {
        if ([x boolValue]) {
            [SVProgressHUD showWithStatus:@"正在登录中"];
        }
    }];