show cancel if skills dirty

Yep/ViewControllers/Nav/YepNavigationController.swift

@@ -18,7 +18,6 @@ class YepNavigationController: UINavigationController, UIGestureRecognizerDelega
             
             delegate = self
         }
-        // Do any additional setup after loading the view.
     }
 
     override func didReceiveMemoryWarning() {
@@ -77,14 +76,52 @@ class YepNavigationController: UINavigationController, UIGestureRecognizerDelega
         return true
     }
 
-    /*
-    // MARK: - Navigation
-
-    // In a storyboard-based application, you will often want to do a little preparation before navigation
-    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
-        // Get the new view controller using segue.destinationViewController.
-        // Pass the selected object to the new view controller.
-    }
-    */
-
 }
+
+// http://stackoverflow.com/questions/20327165/popviewcontroller-strange-behaviour
+// 很难work，无法重载
+//// MARK: UINavigationBarDelegate
+//
+//extension UINavigationController {
+//
+////    func navigationBar(navigationBar: UINavigationBar, shouldPopItem item: UINavigationItem) -> Bool {
+////        return true
+////    }
+//}
+//
+//extension YepNavigationController: UINavigationBarDelegate {
+//
+//    //override
+//    func navigationBar(navigationBar: UINavigationBar, shouldPopItem item: UINavigationItem) -> Bool {
+//
+//        let forcePop: () -> Void = {
+//            self.dirtyAction = nil
+//            self.forcePopAction?()
+//            self.forcePopAction = nil
+//        }
+//
+//        if let dirtyAction = dirtyAction {
+//
+//            YepAlert.confirmOrCancel(title: NSLocalizedString("Notice", comment: ""), message: NSLocalizedString("Save before pop?", comment: ""), confirmTitle: NSLocalizedString("OK", comment: ""), cancelTitle: NSLocalizedString("Cancel", comment: ""), inViewController: self.topViewController, withConfirmAction: {
+//
+//                dirtyAction()
+//
+//                forcePop()
+//
+//            }, cancelAction: {
+//                forcePop()
+//            })
+//            
+//            return false
+//        }
+//
+//        return true
+//        //return super.navigationBar(navigationBar, shouldPopItem: item)
+//    }
+//
+//    func navigationBar(navigationBar: UINavigationBar, didPopItem item: UINavigationItem) {
+////        self.forcePopAction?()
+////        self.forcePopAction = nil
+//        self.popViewControllerAnimated(true)
+//    }
+//}

Yep/ViewControllers/Register/RegisterPickSkillsViewController.swift

@@ -11,6 +11,17 @@ import UIKit
 class RegisterPickSkillsViewController: BaseViewController {
 
     var isRegister = true
+    var isDirty = false {
+        didSet {
+            if !isRegister {
+                let backBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Cancel, target: self, action: "cancel")
+                navigationItem.leftBarButtonItem = backBarButtonItem
+            }
+
+            navigationItem.rightBarButtonItem?.enabled = true
+        }
+    }
+
     var afterChangeSkillsAction: ((masterSkills: [Skill], learningSkills: [Skill]) -> Void)?
 
     @IBOutlet weak var skillsCollectionView: UICollectionView!
@@ -39,8 +50,9 @@ class RegisterPickSkillsViewController: BaseViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
 
-        let doneBarButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "saveSkills:")
-        navigationItem.rightBarButtonItem = doneBarButton
+        let doneBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Done, target: self, action: "saveSkills:")
+        navigationItem.rightBarButtonItem = doneBarButtonItem
+        navigationItem.rightBarButtonItem?.enabled = false
 
         if !isRegister {
             navigationItem.titleView = NavigationTitleLabel(title: NSLocalizedString("Change Skills", comment: ""))
@@ -70,7 +82,15 @@ class RegisterPickSkillsViewController: BaseViewController {
         }
     }
 
+    func cancel() {
+        navigationController?.popViewControllerAnimated(true)
+    }
+
     @IBAction func saveSkills(sender: AnyObject) {
+        doSaveSkills()
+    }
+
+    func doSaveSkills() {
 
         YepHUD.showActivityIndicator()
 
@@ -236,6 +256,10 @@ class RegisterPickSkillsViewController: BaseViewController {
 
                     self.updateSkillsCollectionView()
 
+                    if !self.isDirty {
+                        self.isDirty = success
+                    }
+
                     return success
                 }
             }