简介

    git地址: https://github.com/ReactiveX/RxSwift
    参考资料:http://t.swift.gg/d/2-rxswift
    
    ReactiveX是通过可观察的流实现异步编程的一种API，它结合了观察者模式、迭代器模式和函数式编程的精华，RxSwift 是 ReactiveX 编程思想的一种实现。

1. 创建Observable序列

• never:创建一个不会终止且不发出任何事件的序列

let neverSequence = Observable<Int>.never()

_ = neverSequence
    .subscribe { _ in
        print("这句话永远不会打出来.")
}

• empty: 创建一个只会发出一个completed事件的序列

let emptySequence = Observable<Int>.empty()

_ = emptySequence
    .subscribe { event in
        print(event)
}

• just: 创建一个只有一个元素的序列

let singleElementSequence = Observable.just(32)

_ = singleElementSequence
    .subscribe { event in
        print(event)
}

• of：创建一个固定数量元素的序列

let sequenceOfElements/* : Observable<Int> */ = Observable.of(0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

_ = sequenceOfElements
    .subscribe { event in
        print(event)
}

• from: 从一个数组，字典，Set中创建一个序列

Observable.from(["A","B","C","D"]).subscribe(onNext: {
    print($0)
})

• range: 创建一个有范围的序列

let rangeSequence = Observable.range(start: 1, count: 10)

_ = rangeSequence.subscribe { event in
    print(event)
}

• repeatElement: 创建一个发送重复值的序列

let repeatElementSequence = Observable.repeatElement(1)

_ = repeatElementSequence.subscribe { event in
    print(event)
}

注:

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