How to reload data in UITableViewDataSource

Question

Since UITableView is in UIViewController, I made a class that conforms UITableViewDataSource protocol and attaches it to the table view in UIViewController's viewDidLoad() like below.

delegate for table view in UIViewTableController:

class TableViewController: NSObject, UITableViewDataSource, UITableViewDelegate {       
    var data

    // where should I do this task and how can i reload data after task? 
    data = asyncFuncToGetData() 

    // this is not working
    override init() {
        data = asyncFuncToGetData() 
    }

    func tableView() {
        // uses variable data
    }
}

UIViewController:

class ContainerViewController: UIViewController {
    @IBOutlet weak var mainTableView: UITableView!
    let delegate = TableViewController()

    override func viewDidLoad() {
        super.viewDidLoad()

        mainTableView.dataSource = delegate
        mainTableView.delegate = delegate
    }
}

I have to fetch data from server because table needs it. So where should I do that? This can be done easily when UITableViewController conforms UITableViewDataSource protocol, but I do not want that way.

fetch data in viewDidLoad method.

Muhammad Shauket
– Muhammad Shauket

2018-02-22 04:46:26 +00:00
Commented Feb 22, 2018 at 4:46 — Muhammad Shauket
– Muhammad Shauket, Commented Feb 22, 2018 at 4:46

Agent Smith · Accepted Answer · 2018-02-22 04:45:49Z

1

You can fetch your data in ViewDidLoad and then feed it to your delegate:

override func viewDidLoad() {
    super.viewDidLoad()

    mainTableView.dataSource = delegate
    mainTableView.delegate = delegate

       asynFuncToGetData( { newData in
             //Assign New Data to your delegate class's data
             self.delegate.data = newData
             //Call Reload data on tableView's instance
             self.delegate.tableView()
       }  
}

Hope it helps!!

answered Feb 22, 2018 at 4:45

Agent Smith

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1 Comment

soonoo Over a year ago

I forgot that deletage is just a object. Thank you

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