ReactiveSwift示例

1、UIButton监听点击

btn.reactive.controlEvents(.touchUpInside).observeValues { (btn) in
    print("点到我了")
}

2、UItextfield监听

 // 监听tf的输入值
tf.reactive.continuousTextValues.observeValues { (text) in
    print(text ?? "")
}

// 监听tf的输入长度
tf.reactive.continuousTextValues.map { (text) -> Int in
    return text!.characters.count
}.observeValues { (count) in
    print(count)
}

// 当输入字符长度大于3时，才会接收到信息
tf.reactive.continuousTextValues.filter { (text) -> Bool in
    return text!.characters.count>3
}.observeValues { (text) in
    print(text ?? "")
}

3、监听UIViewController的viewWillAppear方法

self.reactive.trigger(for: #selector(UIViewController.viewWillAppear(_:))).observeValues { () in
     print("viewWillAppear被调用了哦")
}

4、在OneVC里，监听TwoVC的deinit

let twoVC = TwoVC()
twoVC.reactive.lifetime.ended.observeCompleted {
    print("textVC已成功销毁")
}
navigationController?.pushViewController(twoVC, animated: true)

5、RAC替换代理

// 监听_redView有没有调用btnClick:,如果调用了就会转换成信号
[[_redView rac_signalForSelector:@selector(btnClick:)] subscribeNext:^(id x) {
    NSLog(@"控制器知道,点击了红色的view");
}];

6、KVO

@property (nonatomic, assign) int age;
// 把监听到内容转换成信号
[[self rac_valuesForKeyPath:@"age" observer:nil] subscribeNext:^(id x) {
    // block:只要属性改变就会调用,并且把改变的值传递给你
    NSLog(@"%@",x);
}];
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    self.age++;
}

7、监听通知

// 只要发出这个通知,又会转换成一个信号
[[[NSNotificationCenter defaultCenter] rac_addObserverForName:UIKeyboardWillShowNotification object:nil] subscribeNext:^(id x) {
    NSLog(@"弹出键盘");
}];