Simulate Gesture on Views in Swift (draft)

SimulateGestureOnView.swift

class ViewController: UIViewController {
    
    private(set) var tap: UITapGestureRecognizer
    
    init(tap: UITapGestureRecognizer) {
        self.tap = tap
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        tap.addTarget(self, action: #selector(tapButton))
        self.view.addGestureRecognizer(tap)
    }
    
    @objc private func tapButton() {
        print("Tap Gesture Ok")
    }
}

final class UITapGestureRecognizerFake: UITapGestureRecognizer {
    
    private var testTarget: Any? = nil
    private var testAction: Selector? = nil
    
    init() {
        super.init(target: nil, action: nil)
    }
    
    override func addTarget(_ target: Any, action: Selector) {
        testTarget = target
        testAction = action
    }
    
    func perfomrTouch() {
        guard let selector = self.testAction else { return }
        (testTarget as AnyObject).perform(selector, on: Thread.current, with: self, waitUntilDone: true)
    }
}

let tap = UITapGestureRecognizerFake()
let viewController = ViewController(tap: tap)
viewController.view.layoutIfNeeded()

let t = viewController.tap as? UITapGestureRecognizerFake
t?.perfomrTouch()

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