Intercept Action Swizzling in Swift

InterceptAction.swift

  @objc static func swizzleMethod() {
    
    guard self == UIApplication.self else {
      return
    }
    
    let sendActionSelector = #selector(self.sendAction(_:to:from:for:))
    let swizzleActionSelector = #selector(self.interceptAction(_:to:from:for:))
    
    let sendActionMethod = class_getInstanceMethod(self, sendActionSelector)
    let swizzleActionMethod = class_getInstanceMethod(self, swizzleActionSelector)
    
    method_exchangeImplementations(sendActionMethod!, swizzleActionMethod!)    
  }
  
    @objc func interceptAction(_ action: Selector,
                             to target: Any?,
                             from sender: Any?,
                             for event: UIEvent?) -> Bool {
    
    DispatchQueue.main.async {
      self.captureSenderInfo(sender: sender)
    }
    return self.interceptAction(action, to: target, from: sender, for: event)
  }

  internal func captureSenderInfo(sender: Any?) {
    
    if let button = sender as? UIButton {
      logButton(T: button)
    } else if let barButton = sender as? UIBarButtonItem {
      logBarButton(T: barButton)
    } else if let pageControl = sender as? UIPageControl {
      logPageControl(T: pageControl)
    }
    
  }
  
  func logButton<T>(T: T) where T: UIButton {
    print(T.currentTitle)
  }

  func logBarButton<T>(T: T) where T: UIBarButtonItem {
    print(T.title) 
  }
    
  func logPageControl<T>(T: T) where T: UIPageControl {
    print(T.currentPage)
  }