UIButton imp demo

mybutton.swift

import UIKit

class SFTargetAction: NSObject {
    var target:NSObject
    var action:Selector
    var event:UIControlEvents
    init(_ t:NSObject,a:String,e:UIControlEvents) {
        
        target = t
        action = NSSelectorFromString(a)
        event  = e
    }
}
class MyButton: UIView {

    var targetActions:[SFTargetAction] = []
    
    func addTarget(_ target: Any?, action: String, for controlEvents: UIControlEvents){
        let t = SFTargetAction.init(target! as! NSObject, a:action , e: controlEvents)
        targetActions.append(t)
    }
    func sendAction(_ event:UIControlEvents){
        for t in targetActions {
            //support mutil envents 
            if (t.event.rawValue & event.rawValue) ==  event.rawValue{ {
                let action = t.action
                
                t.target.perform(action, with: self)
            }
        }
    }
}


class ViewController: UIViewController {
    
    @IBOutlet weak var myButton: UIButton!
    @IBOutlet weak var testButton: MyButton!
    @IBAction func testAction(_ sender: Any) {
        print("mybtn tabped")
    }
    @IBOutlet weak var textView: UITextView!
    override func viewDidLoad() {
        super.viewDidLoad()
       
        testButton.addTarget(self, action: "testAction2:", for: UIControlEvents.touchUpInside)
        // Do any additional setup after loading the view, typically from a nib.
    }
    @IBAction func testAction2(_ sender: Any) {
        print("mybtn tabped2")
    }
    func refresh(_ text:String) {
        textView.text = text
        let e = UIControlEvents.touchUpInside
        testButton.sendAction( e)
    }
}