Cannot convert value of type '(() throws -> Void?) -> ()' to expected argument type '((Void) throws -> Void)?'

Question

I have a reactive method who should return ((Void) throws -> Void)? to be used into .on(onNext: myUIComponent.rx.function) but no matters what I do I never get what is expected.

I was tries

func name() throws -> Void?

func name(xpto: ((Void) throws -> Void?) = nil)

Someone have some idea?

score 2 · Answer 1 · answered Jul 16 '19 at 14:00

2

Have you tried

func name(xpto: ((Void) throws -> Void)? = nil)

(? outside of the parenthesis.) That makes the whole closure optional, rather than an optional that returns a void optional, which doesn't make sense.

answered Jul 16 '19 at 14:00

Duncan C

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173
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Yeah @Duncan C, the "solution" was posted above. – Rafael Sachetto Jul 16 '19 at 14:15

score 0 · Accepted Answer · answered Jul 16 '19 at 13:59

0

D'oh, nothing is necessary, just create a func name() without return like

extension Reactive where Base: ReactiveUIComponent {
    func name() {
        ...
    }
}

button.rx.tap
    .do(onNext: reactiveUIComponent.rx.name)
    ...

answered Jul 16 '19 at 13:59

Rafael Sachetto

121
7

Cannot convert value of type '(() throws -> Void?) -> ()' to expected argument type '((Void) throws -> Void)?'

2 Answers2