Debugging_Operators.md

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附录(一) 调试

为了方便调试Rx代码的操作符。

debug

打印多有的subscriptions, events, disposals

example("debug") {
    let disposeBag = DisposeBag()
    var count = 1
    
    let sequenceThatErrors = Observable<String>.create { observer in
        observer.onNext("🍎")
        observer.onNext("🍐")
        observer.onNext("🍊")
        
        if count < 5 {
            observer.onError(TestError.test)
            print("Error encountered")
            count += 1
        }
        
        observer.onNext("🐶")
        observer.onNext("🐱")
        observer.onNext("🐭")
        observer.onCompleted()
        
        return Disposables.create()
    }
    
    sequenceThatErrors
        .retry(3)
        .debug()
        .subscribe(onNext: { print($0) })
        .addDisposableTo(disposeBag)
}

---

RxSwift.Resources.total

RxSwift.Resources.total 提供一个对所有allocation的计数，来观察是否有内存泄漏。

#if NOT_IN_PLAYGROUND
#else
example("RxSwift.Resources.total") {
    print(RxSwift.Resources.total)
    
    let disposeBag = DisposeBag()
    
    print(RxSwift.Resources.total)
    
    let variable = Variable("🍎")
    
    let subscription1 = variable.asObservable().subscribe(onNext: { print($0) })
    
    print(RxSwift.Resources.total)
    
    let subscription2 = variable.asObservable().subscribe(onNext: { print($0) })
    
    print(RxSwift.Resources.total)
    
    subscription1.dispose()
    
    print(RxSwift.Resources.total)
    
    subscription2.dispose()
    
    print(RxSwift.Resources.total)
}
    
print(RxSwift.Resources.total)
#endif

RxSwift.Resources.total 默认是不可用的, 一般不在发布版本中启用. 点此 了解怎样使其可用.

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