Category "grand-central-dispatch"

CORS BLOCKED 'Access-Control-Allow-Origin' Firebase Functions not allowed

I had an error when sending data to a firebase database : Access to fetch at 'https://us-central1-pwagram-f39a5.cloudfunctions.net/storePostData' from origi

Swift 5.5 Concurrency: how to serialize async Tasks to replace an OperationQueue with maxConcurrentOperationCount = 1?

I’m currently migrating my app to use the concurrency model in Swift. I want to serialize Tasks to make sure they are executed one after the other (no par

ARKit -[UIView setAnimationsEnabled:] Performing any operation from a background thread on UIView or a subclass is not supported

I have a ViewController that has a collectionView inside of it. I display the contents of the collectionView's cells inside an ARSCNView. When I set the ViewCo

dispatchGroup.notify(queue: inheriting QOS from the current context

Is there a way to dispatchGroup.notify(queue: inheriting QOS from the current context? (assuming there IS qos metainfo that's dragged through all the contexts t

dispatch_once after the Swift 3 GCD API changes

What is the new syntax for dispatch_once in Swift after the changes made in language version 3? The old version was as follows. var token: dispatch_once_t = 0