Set default action for all UISlider programmatically

Question

My application is at the prototype development stage. Some sliders do not have any actions assigned to them either through the storyboard or programmatically.

I need to display a warning when the slider stops during testing. Can this be done with the extension UISlider?

How to assign a default action to UISliderwhen dragging is completed to show a warning if another assignment is not assigned through the interface builder or programmatically?

Similar question

Answer 1

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    self.checkButtonAction()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)

}

}

extension UIViewController{
    func checkButtonAction(){
        for view in self.view.subviews as [UIView] {
            if let btn = view as? UISlider {
                if (btn.allTargets.isEmpty){
                    btn.add(for: .allTouchEvents, {
                        if (!btn.isTracking){
                            let alert = UIAlertController(title: "Test 3", message:"No selector", preferredStyle: UIAlertControllerStyle.alert)

                            // add an action (button)
                            alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))

                            // show the alert
                            self.present(alert, animated: true, completion: nil)
                        }
                    })
                }
            }
        }

    }
}

class ClosureSleeve {
    let closure: ()->()

init (_ closure: @escaping ()->()) {
    self.closure = closure
}

@objc func invoke () {
    closure()
}
}

extension UIControl {
    func add (for controlEvents: UIControlEvents, _ closure: @escaping ()->()) {
        let sleeve = ClosureSleeve(closure)
        addTarget(sleeve, action: #selector(ClosureSleeve.invoke), for: controlEvents)
        objc_setAssociatedObject(self, String(format: "[%d]", arc4random()), sleeve, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN)
    }
}

Check out this modified answer.