MotionInMotion Episode 3 - More Delegates, KVO, and Target Action

More Delegates, KVO, and Target Action - MotionInMotion

postを追加、バッジの更新などの実装

• CreatePostController
  • def viewDidLoad
    • @createPostView = CreatePostView.alloc.initWithFrame(self.view.frame)
    • @createPostView.delegate = self
• CreatePostView
  • def createPostButtonPressed
    • if self.delegate.respond_to?('createPostView:didCreatePostWithDetails')
    • self.delegate.createPostView
• KVO (key value observing)
  • PostsController
    • @postsModel = UIApplication.sharedApplication.delegate.postsModel
    • @postsModel.addObserver(self, forKeyPath
      • options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld)
    • def observeValueForKeyPath(keyPath, ofObject:object, change:change, context:context)
      • if keyPath == 'newRecordCount' && (change[NSKeyValueChangeNewKey] - change[NSKeyValueChangeOldKey]) > 0
      • self.tableView.reloadData
      • self.tabBarController.tabBar.items[0].badgeValue = change[NSKeyValueChangeNewKey].to_s
    • def viewDidAppear(animated)
      • self.tabBarController.tabBar.items[0].badgeValue = nil