Can I make #selector refer to a closure in Swift?

Question

I want to make a selector argument of my method refer to a closure property, both of them exist in the same scope. For example,

func backgroundC         


        

Answer 1

Swift 5.2.x

First of all, you need to declare an "easy to use" typealias for your block:

typealias Completion = () -> ()

Then, you must declare private var to use "as a gate" for your function:

private var action: Completion?

After that, you should create a function that can be called by your Selector (it accept only string format) and to call private completion:

@objc func didAction() {
     self.action?()
}

Finally you can re-write your function (using the new swift syntax) like:

Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(didAction), userInfo: nil, repeats: false)
self.action = backToOriginalBackground

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P.S.: Remember that your variable (or parameter if you embed it to a function) must be of the same of type declared to your typeAlias so, in our case:

var backToOriginalBackground: () -> ()

or also:

var backToOriginalBackground: Completion