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iosswiftuitableviewpromisekit

Reloading tableview in Promisekit's then

I am trying to make async. request using Promisekit's promises. I have the following code in a subclass of UITableViewController, to reload tableview with data that is fetched from async. request.

my_promise.then { asynly_fetched_data in 
  self.data = asyncly_fetched_data
  self.tableView.reloadData()
}

However, the following statement (self.tableView.reloadData()) is causing the following build error.

 Missing return in a closure expected to return 'AnyPromise'

Is it because we cannot call reloadData() inside a closure. IF that is the case, what is the best practice to reload tableview after asynchronous request is complete.

Solution

  • It's a swift bug. But you can fix it by adding -> Void in your closure:

    my_promise.then { asynly_fetched_data -> Void in 
  self.data = asyncly_fetched_data
  self.tableView.reloadData()
}

    That way, Swift knows that the return is Void.