RxSwift: single observable self is nil

Question

I'm trying to implement RxSwift single observable:

class Doctor {
    var disposeBag = DisposeBag()

    func sanityCheck() -> Single<String> {
        return Single<String>.create {[weak self] observer in
            if self?.amICrazy() == true {
                observer(.success("Yes, you are crazy"))
            }else {
                observer(.error(someError.notCrazy))
            }
            return Disposables.create()
        }
    }

    func amICrazy() -> Bool {
        return arc4random_uniform(2) == 0
    }
}

But the problem the self is always nil.

Any of you knows why self is nil or how can fix it?

I'll really appreciate your help.

Answer 1

You using weak capture for self in creation closure for Single, so unless you hold strong reference on your Doctor object, it will be deallocated as soon as you leave allocation context.

BTW, in latest swift you can use Bool.random() to get random boolean value.

func amICrazy() -> Bool {
    return Bool.random() // or just .random()
}