How to make one tableView with two dataSources in Swift?-CodePudding

The

Here is the method to get all pictures of cats

func fetchData() { guard let endPoint = // myEndpoint else { return } endpoint.queryItems = queryParameters.map({ (key, value) in URLQueryItem(name: key, value: value) // some parameters }) guard let url = endpoint.url else { return } var request = URLRequest(url: url) request.setValue(ApiClient.Identifiers.apiKey, forHTTPHeaderField: "x-api-key") let task = URLSession.shared.dataTask(with: request) { data, response, error in DispatchQueue.main.async { if error != nil { print(error.debugDescription) } else { do { let myData = try JSONDecoder().decode([CatModel].self, from: data!) self.catsModel = myData // catsModel is an array with struct with cats info (breed, category, id, etc.) self.tableView.dataSource = myData as? any UITableViewDataSource self.tableView.reloadData() } catch let error { print(error) } } } } task.resume()

}

Here is the method for filter by categories id :

func fetchCategoryData(categoryID: Int) { let endpoint = URLComponents // url components guard let url = endpoint?.url else { return } var request = URLRequest(url: url) request.setValue(ApiClient.Identifiers.apiKey, forHTTPHeaderField: "x-api-key") let task = URLSession.shared.dataTask(with: request) { data, response, error in DispatchQueue.main.async { if error != nil { print(error.debugDescription) } else { do { let myData = try JSONDecoder().decode([CatModel].self, from: data!) self.catsModel = myData self.tableView.reloadData() } catch let error { print(error) } } } } task.resume() }

In CategoryViewController I made this method:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { let searchViewController = SearchViewController() let cat = catsModel[indexPath.row] searchViewController.fetchCategoryData(categoryID: cat.id) // this line works, but in fetchCategoryData doesn't happenings the reload of tableView with new data
}

Thank you very much!

CodePudding user response：

I'm not sure but issue may get fixed with one line change

Instead of this -

self.tableView.dataSource = myData as? any UITableViewDataSource

Try writing this -

self.tableView.dataSource = self

CodePudding user response：

There are various ways to filter data - but the code you posted doesn't make much sense.

You say:

"self.catsModel = myData // catsModel is an array with struct with cats info"

and:

"self.tableView.dataSource = myData as? any UITableViewDataSource"

but, you cannot assign an Array as a table view data source.

One approach is to do this:

var allCats: [CatModel] = [] var filteredCats: [CatModel] = []

then set self as the data source:

self.tableView.dataSource = self

To start, download / retrieve ALL Cats data and "store" it in allCats.

When the user selects a "filter," fill filteredCats:

self.filteredCats = self.allCats.filter({ $0.id == selectedFilterID })

Now your data source funcs can look something like this:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { if selectedFilterID == nil { return allCats.count } return filteredCats.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "c", for: indexPath) as! CatCell var thisCat: CatModel! if selectedFilterID == nil { thisCat = allCats[indexPath.row] } else { thisCat = filteredCats[indexPath.row] } // set the cell's values / properties return cell }

IF your API has a database of lots and lots of Cats (such as 50,000), or you ALWAYS have a Filter selected, you may not want to download all of the data.

In that case, you don't need a filteredCats array...

Instead, when a Filter is selected, fill allCats by requesting only the matching records from your API and call reload data on the table view.

Your data source funcs are then simpler:

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return allCats.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "c", for: indexPath) as! CatCell let thisCat = allCats[indexPath.row] // set the cell's values / properties return cell }