协议后的JSON解析

Question

I implemented a carousel with a collection view. I want to parse a JSON data into it, but the JSON parses after the necessary protocols. Because of this the array is empty when i try to configure the cells.

I know the problem occurs when I try to reload the data. When I do this in a table view controller I can just call tableView.reloadData() but I can't do this in the normal view controller I use.

        self.view.setNeedsLayout()
        self.view.layoutIfNeeded()

This is the order when i print it: loadjson numberofsections cellforitemat cellforitemat parsejson

Answer 1

When I do this in a table view controller I can just call tableView.reloadData() but I can't do this in the normal view controller

in normal vc you should have a property like

@IBOutlet weak var collectionView:UICollectionView!

and reload it when needed unlike the collection controller which encapsulates that property by default

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Regrading the order of getting the data is asynchronous so check this CollectionView not display data after parsing JSON for a similar case

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These 2 lines

self.view.setNeedsLayout()
self.view.layoutIfNeeded()

are totally irrelevant , they used for refreshing the UI and constraints