Reload collection view data from another view class

Question

I have two containers in a view. The top one has a collection view. I want to update my collection view from a button when a button is hit from the below container. My butto

Answer 1

I have added

NSNotificationCenter.defaultCenter().addObserver(self, selector: "loadList:", name:"load", object: nil)

in my viewdidload of my collection view class. also added a selector which reloads my data when it is called by the Notification Center

func loadList(notification: NSNotification){
    self.favoritesCV.reloadData()
}

and for the other class where the button is pressed:

NSNotificationCenter.defaultCenter().postNotificationName("load", object: nil)

Swift 3:

NotificationCenter.default.addObserver(self, selector: #selector(loadList), name:NSNotification.Name(rawValue: "load"), object: nil)

NotificationCenter.default.post(name: NSNotification.Name(rawValue: "load"), object: nil)

Answer 2

Great! I was looking for this. In Swift 3 the code is slightly different. In collectionviewcontroller:

NotificationCenter.default.addObserver(self, selector: #selector(RoundCollectionViewController.load), name:NSNotification.Name(rawValue: "reload"), object: nil)

and in the other one:

NotificationCenter.default.post(name: NSNotification.Name(rawValue: "load"), object: nil)

Answer 3

Swift 4:

1st class:

NotificationCenter.default.post(name: NSNotification.Name("load"), object: nil)

Class with collectionView:

in viewDidLoad():

NotificationCenter.default.addObserver(self, selector: #selector(loadList(notification:)), name: NSNotification.Name(rawValue: "load"), object: nil)

and function:

@objc func loadList(notification: NSNotification) {
  self.collectionView.reloadData()
}