-
catchErrorJustReturn
当遇到 error 事件的时候，就返回指定的值，然后结束
let sequenceThatFails = PublishSubject<String>()
sequenceThatFails
.catchErrorJustReturn("错误")
.subscribe(onNext: { print($0) })
.disposed(by: disposeBag)
sequenceThatFails.onNext("a")
sequenceThatFails.onNext("b")
sequenceThatFails.onNext("c")
sequenceThatFails.onError(MyError.A)
sequenceThatFails.onNext("d")
-
catchError
该方法可以捕获 error，并对其进行处理
同时还能返回另一个 Observable 序列进行订阅（切换到新的序列）
let sequenceThatFails = PublishSubject<String>()
let recoverySequence = Observable.of("1", "2", "3")
sequenceThatFails
.catchError {
print("Error:", $0)
return recoverySequence
}
.subscribe(onNext: { print($0) })
.disposed(by: disposeBag)
sequenceThatFails.onNext("a")
sequenceThatFails.onNext("b")
sequenceThatFails.onNext("c")
sequenceThatFails.onError(MyError.A)
sequenceThatFails.onNext("d")
-
retry
使用该方法当遇到错误的时候，会重新订阅该序列。比如遇到网络请求失败时，可以进行重新连接
retry() 方法可以传入数字表示重试次数。不传的话只会重试一次
var count = 1
let sequenceThatErrors = Observable<String>.create { observer in
observer.onNext("a")
observer.onNext("b")
//让第一个订阅时发生错误
if count == 1 {
observer.onError(MyError.A)
print("Error encountered")
count += 1
}
observer.onNext("c")
observer.onNext("d")
observer.onCompleted()
return Disposables.create()
}
sequenceThatErrors
.retry(2) //重试2次（参数为空则只重试一次）
.subscribe(onNext: { print($0) })
.disposed(by: disposeBag)
参考文章：Swift - RxSwift的使用详解15（错误处理）
