How to create a function that inserts data into a block - ios

Question

First can someone help me come up with a better title? I just don't know the correct terminology on this one.
Here is my code,
func loadPublicFeed() {
ref = FIRDatabase.database().reference()
ref.child("brackets").observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
if let bracketsSnapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
for brackets in bracketsSnapshot {
if let bracketsDict = brackets.value as? Dictionary <String, Any> {
let key = brackets.key as String
let post = BracketsPublicFeed(postKey:key, postData: bracketsDict)
self.posts.insert(post, at: 0)
}
}
}
self.stopRefresher()
self.collectionView.reloadData()
self.watchlistClicked = false
})
}
download data then do stuff. I want to take this function refactor it so I can just call the refactored function and add these
self.stopRefresher()
self.collectionView.reloadData()
self.watchlistClicked = false
into it.
It might look something like this,
func loadFeedTest() {
fetchTest.loadPublicFeed(collectionView: self.collectionView, completionHandler: { () -> Void in
self.stopRefresher()
self.collectionView.reloadData()
self.watchlistClicked = false
})
I have tried using a completionHandler something like func loadPublicFeed(completionHandler: () -> Void) then the code. I have done many variations of this. I feel like I might be on the right path but I just can't nail this down.

Answer 1

You can refactor your function in the following way:
func loadPublicFeed(collectionView: UICollectionView, completionHandler:() -> Void) {
ref = FIRDatabase.database().reference()
ref.child("brackets").observeSingleEvent(of: FIRDataEventType.value, with: { (snapshot) in
if let bracketsSnapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
for brackets in bracketsSnapshot {
if let bracketsDict = brackets.value as? Dictionary <String, Any> {
let key = brackets.key as String
let post = BracketsPublicFeed(postKey:key, postData: bracketsDict)
self.posts.insert(post, at: 0)
}
}
}
completionHandler();
})
}