CODEWITHSUNDEEP
iosswiftuicollectionview
cedric petetin
cedric petetin

Reputation: 809

Swift : collectionView takes too long to display

I am developing an iOS application in Swift.

I display data from database inside a collectionview but it takes too much time to appear on screen. Surely a thread problem because on Xcode console, I can see data being displayed 20 seconds before it appears on the screen. Here is my code : https://github.com/ProjetCedibo/projet/blob/master/Projet-L3-master/appli/SJEPG/SJEPG/CenterViewController.swift

How can I make the collectionView being displayed faster ?

Upvotes: 0

Views: 953

Answers (3)

bits
bits

Reputation: 1705

In addition to @StefanArentz answer

For Swift 3: 

DispatchQueue.main.async {
   // code to reload collection view
}

Upvotes: 1

PSS
PSS

Reputation: 316

What happens is that code is probably run on a secondary thread. Any UI changes you make should be made on the main thread. So try this:

dispatch_async(dispatch_get_main_queue()){
    // reload your collection view here
})

Upvotes: 1

Stefan Arentz
Stefan Arentz

Reputation: 34935

If this happens, it means you are making UI changes from a thread other than the main thread. Try this:

func refresh() {
    dispatch_async(dispatch_get_main_queue(), {
        self.eventsCollection.reloadData()
    })
}

Upvotes: 3

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