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。

retry

订阅失败了,再尝试重新订阅.比如网络请求失败，可以进行重新连接。

let disposeBag = DisposeBag()
var count = 1
    
let retrySequence = Observable<String>.create { (observer) -> Disposable in
    observer.onNext("🍎")
    observer.onNext("🍐")
        
    if count == 1 {
        observer.onError(TestError.test)
        print("Error encountered")
        count += 1
    }
        
    observer.onNext("🐶")
    observer.onNext("🐱")
        
    return Disposables.create()
}
    
retrySequence.retry().subscribe(onNext: {print($0)}).disposed(by: disposeBag)

结果:
🍎
🍐
Error encountered
🍎
🍐
🐶
🐱

retry(_:)

跟retry相同,多了一个重试次数的参数

catchError

遇到错误时,返回一个新序列.

let disposeBag = DisposeBag()
    
let sequenceThatFails = PublishSubject<String>()
let recoverySequence = PublishSubject<String>()
    
sequenceThatFails.catchError {
        print("Error:", $0)
        return recoverySequence
    }.subscribe { print($0) }.disposed(by: disposeBag)
    
sequenceThatFails.onNext("😬")
sequenceThatFails.onNext("😨")
sequenceThatFails.onNext("😡")
sequenceThatFails.onError(TestError.test)
    
recoverySequence.onNext("😊")

结果:
next(😬)
next(😨)
next(😡)
Error: test
next(😊)

catchErrorJustReturn

遇到错误,就返回一个值.

let sequenceThatFails = PublishSubject<Int>()

_ = sequenceThatFails
    .catchErrorJustReturn(100)
    .subscribe {
        print($0)
}

sequenceThatFails.on(.Next(1))
sequenceThatFails.on(.Next(2))
sequenceThatFails.on(.Next(3))
sequenceThatFails.on(.Error(NSError(domain: "Test", code: 0, userInfo: nil)))
sequenceThatFails.on(.Next(4))

注

如有侵权,请告知删除.