Add enabled control to Demo

Author: morizotter

Demo/Demo/ObserverViewController.swift

@@ -17,12 +17,11 @@ final class KeyboardObserverViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        navigationItem.title = "Observer"
-        
         keyboard.observe { [weak self] (event) -> Void in
             guard let s = self else { return }
             switch event.type {
             case .willShow, .willHide, .willChangeFrame:
+                print("Fire: \(event.type)")
                 let distance = UIScreen.main.bounds.height - event.keyboardFrameEnd.origin.y
                 let bottom = distance >= s.bottomLayoutGuide.length ? distance : s.bottomLayoutGuide.length
 
@@ -34,6 +33,20 @@ final class KeyboardObserverViewController: UIViewController {
                 break
             }
         }
+        
+        navigationItem.title = "Observer"
+        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .action, target: self, action: #selector(self.rightButtonDidTap))
+    }
+    
+    func rightButtonDidTap() {
+        let message = keyboard.isEnabled ? "Disable keyboard observing?" : "Enable keyboard ovserving?"
+        
+        let controller = UIAlertController(title: "Keyboard observing", message: message, preferredStyle: .alert)
+        controller.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
+        controller.addAction(UIAlertAction(title: "OK", style: .default, handler: { [unowned self] _ in
+            self.keyboard.isEnabled = !self.keyboard.isEnabled
+        }))
+        present(controller, animated: true, completion: nil)
     }
 }