Add a completion for sorting an Array-CodePudding

I have a list of urls and I will scrape the data of the urls, it take a bit of time so I get each data one by one. but not in the correct order, and then, I will append this data to an array, then set this array to another array which populate data in a UICollectionView. But I have to sort the final array as well, in my current approach, it sorts array when the data is on the screen, and you can their changing position

discoveryFeeds.append(scraper)
discoveryCollectionView.feeds = discoveryFeeds.sorted(by: {$0.feed.createdAt > $1.feed.createdAt})

I want to change it something like that, knowing when the sorting is done that I can do the rest of the process after that

discoveryFeeds.append(scraper)
discoveryFeeds = discoveryFeeds.sorted(by: {$0.feed.createdAt > $1.feed.createdAt})

// and when sorting is done - send to collectionView
discoveryCollectionView.feeds = discoveryFeeds

could anyone help me on that. Thanks

CodePudding user response：

Sorting is not asynchronous. The "sorting is done" when we proceed to the next line.

So, in your second example,

discoveryFeeds = discoveryFeeds.sorted(by: {$0.feed.createdAt > $1.feed.createdAt})

// and when sorting is done - send to collectionView
discoveryCollectionView.feeds = discoveryFeeds

...indeed, we do not set discoveryCollectionView.feeds until the the sorting is done.