How to get the number of rows from a request in tableView method?

Question

I am using a tableViewController on my Swift 3.0 project. I want to get the number of rows of my tableview from a request and I am using Alamofire 4.0 for that purpose.

I saw that to return values from Alamofire you have to set a completionHandler (How to return value from Alamofire) but Xcode do not let me set it on tableView method.

This is the code that I have tried with set/get methods:

var numRows = 0

func setRows(numRows : Int){
    self.numRows = numRows
}

func getRows() -> Int{
    return self.numRows
}

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    var JSON = [[String : AnyObject]]()

    Alamofire.request(url!, method: .get, parameters: nil, encoding: JSONEncoding.default, headers: nil).responseJSON { response in

        switch(response.result) {
            case .success(_):
                JSON = response.result.value as! [[String : AnyObject]]!
                self.setRows(numRows: JSON.count)
                break

            case .failure(_):
                print("Error")
                break
        }
    }

    return self.getRows()
}

but I am not able to make it work. I know that Alamofire request is asynchronous and is the problem that I am facing but I am not able to set completionHandler on tableView function.

P.S: I also have tried to make synchronous Alamofire (making an asynchronous alamofire request synchronous) but completion block again appears and I am not able to set it to tableView method (I do not know if it is possible to set it on that method or I am doing it in the wrong way).

I have tried adding completion:(Int) -> Void to my tableView method but Xcode does not allow me to do that.

What should I do to set the number of rows after doing the request?

Thanks in advance!

Answer 1

I'm doing something like this:

table of items that will be in tableView

var positionsTable = [[String : AnyObject]]()

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return positionsTable.count
}

from request i get items and reload tableView

Alamofire.request(.GET, url, headers: headers, encoding: .JSON)
      .responseJSON { (response) in
          print(response)
          self.positionsTable = response.result.value
          self.tableView.reloadData()
     }
 }