RAC的学习

创建一个信号 (最简单RACSignal信号)

RACSignal *signal = [RACSignal createSignal:^RACDisposable * _Nullable(id<RACSubscriber>  _Nonnull subscriber) {
        [subscriber sendNext:@"1"];
        [subscriber sendCompleted];
        return nil;
    }] ;
    
    [signal subscribeNext:^(NSString *  _Nullable x) {
        NSLog(@"---%@---",x);
    }];

/// 或者  （UI控件状态绑定信号）
    RAC(self.loginButton,enabled) = signal;

信号的聚合

RACSignal *signal = [RACSignal combineLatest:
                                                 @[  _accountTextField.rac_textSignal,
                                                     _passwordTextField.rac_textSignal
                                                  ]
                                          reduce:^id (NSString *account, NSString *password){
                                              
        return @(account.length && password.length);
    }];
    
    [signal subscribeNext:^(id  _Nullable x) {
        
        self.loginButton.enabled = [x boolValue];
        
    }];

RAC (宏)

 RAC(self.titleLable,text) = self.accountTextField.rac_textSignal; // 控件绑定信号

KVC (属性监听)

RAC(self.titleLable,text) = self.accountTextField.rac_textSignal; // 绑定
    
    /// KVO
    [[RACObserve(self.titleLable, text) filter:^BOOL(NSString *  _Nullable value) {
        return value.length > 0;    // 有文字才执行
    }] subscribeNext:^(NSString *  _Nullable x) {
        NSLog(@"%@",x);
    }];