ios – Finest technique to check vallid hyperlinks in feed utilizing Swift or Goal-C

I’m constructing a feed with hyperlinks to multimedia property. If a hyperlink is unhealthy it shouldn’t be within the feed as a video that doesn’t play or picture that doesn’t load is a poor person expertise. The feed is pulled by the cellphone by way of JSON from an endpoint with out the good thing about a websocket.

I can check the hyperlinks earlier than placing them within the feed, nonetheless, ready to confirm a hyperlink takes time and if the feed has many gadgets, I am anticipating gradual loading instances.

Even accepting the delay for validating hyperlinks, I’m combating tips on how to implement asynchronous calls to the hyperlinks inside a synchronous conversion course of as soon as we’ve got downloaded the information.

Right here is the workflow.

1. Asyncchronously import JSON as object. You get a JSON object equivalent to:

   {“feed”:[{“title”:”Check out this video”,”videosurl”:”https://www.youtube.com/somevideo.mp4″}]}

2. Serialize JSON into Array of feed objects (synchronous)

3. Save the array of Feed objects to Core Knowledge (synchronous)

4. Show the objects utilizing an NSFetchedResultsController. (synchronous)

Inside 3-just earlier than saving every merchandise to Core Knowledge would appear like a logical place to check/validate the hyperlinks.

Right here is my code to this point within Step 3

    -(void) saveFeed:(NSArray *)gadgets inContext: (NSManagedObjectContext*) context
     NSEntityDescription *entity = [NSEntityDescription entityForName:@"Videofeed" inManagedObjectContext:context];
    gadgets* merchandise;
    for (i=0;i

@objc public extension NSString {

    @out there(iOS 13.0.0, *)
    func fileExists(at surl: NSString) async throws -> Bool {
        let str = self as String
        
        guard let url =  URL(string: str) else { return false }
       
        var request = URLRequest(url: url)
         request.httpMethod = "HEAD"
         request.timeoutInterval = 1.0 // Modify to your wants
         let (_, response) = strive await URLSession.shared.information(for: request)
         return (response as? HTTPURLResponse)?.statusCode == 200
     }

How can I get trigger the synchronous a part of this workflow to correctly pause for the asynchronous checks of the file validity or is there a greater strategy? Thanks upfront for any options.