RAC,ReactiveSwift

1.创建信号

// 1.通过信号发生器创建(冷信号)
let producer = SignalProducer<String, NoError>.init { (observer, _) in
    print("新的订阅，启动操作")
    observer.send(value: "Hello")
    observer.send(value: "World")
}

let subscriber1 = Observer<String, NoError>(value: { print("观察者1接收到值 \($0)") })
let subscriber2 = Observer<String, NoError>(value: { print("观察者2接收到值 \($0)") })

print("观察者1订阅信号发生器")
producer.start(subscriber1)
print("观察者2订阅信号发生器")
producer.start(subscriber2)
//注意：发生器将再次启动工作

// 2.通过管道创建（热信号）
let (signalA, observerA) = Signal<String, NoError>.pipe()
let (signalB, observerB) = Signal<String, NoError>.pipe()
Signal.combineLatest(signalA, signalB).observeValues { (value) in
    print( "收到的值\(value.0) + \(value.1)")
}
observerA.send(value: "")
//注意:如果加这个就是，发了一次信号就不能再发了
observerA.sendCompleted()
observerB.send(value: "")
observerB.sendCompleted()

//3.创建空信号
let emptySignal = Signal<Any, NoError>.empty
emptySignal.observe { (value) in

}

2.基本控件用法

//MARK:通知
    private func noti() {

        NotificationCenter.default.reactive.notifications(forName: Notification.Name(rawValue: "UIKeyboardWillShowNotification"), object: nil).observeValues { (value) in

        }

        NotificationCenter.default.post(name: Notification.Name(rawValue: "name"), object: self)
    }

    //MARK:KVO
    private func kvoWithRac() {

        view.reactive.values(forKeyPath: "bounds").start { [weak self](rect) in
            print(self?.view ?? "")
            print(rect)
        }
    }

    //MARK:按钮点击
    private func btnWithRAC() {

        //1.点击
        btn.tag =
        btn.isEnabled = true
        btn.reactive.controlEvents(.touchUpInside).observeValues { (btn) in
            print("点击了按钮,颜色\(btn.tag)")
        }
    }

//textField
textField.reactive.continuousTextValues.observeValues { (value) in

        }

3.过滤  filter

//filter作用:过滤   当text>5才会输出
        textField.reactive.continuousTextValues.filter { (text) -> Bool in

            return (text?.characters.count)! >
            }.observe({
                text in
                print(text)
            })

4.转换 map

//每一次map接收到的Value事件，它就会运行closure，以closure的返回值作为Value事件发送出去。上面的代码中，我们的text的值映射成text的字符数
        textField.reactive.continuousTextValues.map { (text) -> Int in
            return (text?.characters.count)!
            }.filter { (length) -> Bool in
                return length >
            }.observe { (length) in
                print(length)
        }

        //(改变属性)使用map与observeValues结合改变属性
        textField.reactive.continuousTextValues
            .map { (text) -> Int in
                return (text?.characters.count)!
            }
            .map { (length) -> UIColor in
                return length >  ? UIColor.red : UIColor.yellow
            }
            .observeValues { (backgroundColor) in
                self.textField.backgroundColor = backgroundColor
        }

5.两个信号结合使用 <~

//1.
let nameSign = textField.reactive.continuousTextValues.map { (text) -> Int in
            return (text?.characters.count)!
        }
        let passSign = passwordtextField.reactive.continuousTextValues.map { (text) -> Int in
            return (text?.characters.count)!
        }
        btn.reactive.isEnabled <~ Signal.combineLatest(nameSign, passSign).map({(namelength : Int, passlength : Int) -> Bool in

            return namelength >=  && passlength >
        })

//2.

Signal.combineLatest(nameSign,passSign).observeValues { (namelength : Int, passlength : Int) in

        }

6.Scheduler(调度器)延时加载

// 主线程上延时0.3秒调用
        QueueScheduler.main.schedule(after: Date.init(timeIntervalSinceNow: 0.3)) {
            print("主线程调用")
        }

        QueueScheduler.init().schedule(after: Date.init(timeIntervalSinceNow: 0.3)){
            print("子线程调用")
        }

7.迭代器

// 数组的迭代器
        let array:[String] = ["name","name2"]
        var arrayIterator =  array.makeIterator()
        while let temp = arrayIterator.next() {
            print(temp)
        }

        // swift 系统自带的遍历
        array.forEach { (value) in
            print(value)
        }

        // 字典的迭代器
        let dict:[String: String] = ["key":"name", "key1":"name1"]
        var dictIterator =  dict.makeIterator()
        while let temp = dictIterator.next() {
            print(temp)
        }

        // swift 系统自带的遍历
        dict.forEach { (key, value) in
            print("\(key) + \(value)")
        }

8.信号联合

func testZip() {
        let (signalA, observerA) = Signal<Any, NoError>.pipe()
        let (signalB, observerB) = Signal<String, NoError>.pipe()

        Signal.zip(signalA, signalB).observeValues { (value) in
            print(value)
        }

        signalA.zip(with: signalB).observeValues { (value) in

        }
        observerA.send(value: "")
        observerA.sendCompleted()
        observerB.send(value: "")
        observerB.sendCompleted()
    }

9.代替delegate

.
import ReactiveCocoa
import ReactiveSwift
import Result

.let (signalTap , observerTap) = Signal<Any, NoError>.pipe()
 observerTap.send(value: tap)
自定义个view
class LyContentView: UIView {

    let (signalTap , observerTap) = Signal<Any, NoError>.pipe()

    override init(frame: CGRect) {
        super.init(frame: frame)

         setUI()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

}

extension LyContentView {
    fileprivate func setUI() {
        backgroundColor = UIColor.yellow

        let tap = UITapGestureRecognizer(target: self, action: #selector(self.tapClick(_:)))
        addGestureRecognizer(tap)
    }

    //使用RAC，替代delegate，闭包
    @objc fileprivate func tapClick(_ tap : UITapGestureRecognizer) {
        observerTap.send(value: tap)
    }
}
.控制器中监听
contentView.signalTap.observeValues { (value) in
            print("点击了view")
        }

Demo:https://github.com/zhangjie579/LyReactiveSwiftDemo