debug

打印所有的订阅，事件以及销毁信息

演示

let disposeBag = DisposeBag()
let sequence = Observable<String>.create { observer in
    observer.onNext("?")
    observer.onNext("?")
    observer.onCompleted()
    return Disposables.create()
}
sequence
    .debug("Fruit")
    .subscribe()
    .disposed(by: disposeBag)

输出结果：

2017-11-06 20:49:43.187: Fruit -> subscribed
2017-11-06 20:49:43.188: Fruit -> Event next(?)
2017-11-06 20:49:43.188: Fruit -> Event next(?)
2017-11-06 20:49:43.188: Fruit -> Event completed
2017-11-06 20:49:43.189: Fruit -> isDisposed