TableView Load More正在不断获取

Question

I setup a TableView and fetching paginated data. For page 1, as it's hitting route without any parameter (eg /?page=2 ). Now I am trying to implement infinite scroll kind load more. I am trying to make a call everytime it hits the 5th row from bottom.

What this code does is fetches non-stop as soon as I hit the 5th cell from bottom. I think it's because the table stays on the 5th cell from bottom and keep adding cells from bottom toward up (but it may be just visual illusion)

class TableView1: UITableViewController {

  var currentPage: Int = 1
  var results: [JSON]? = []
  var urlEndpoint: String?
  var isLoading = false

  override func viewDidLoad() {
       loadItems()
  }

  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    // connections to cell..

    let rowsToLoadFromBottom = 5;
    let rowsLoaded = self.results?.count   // count of fetched items

    if (!isLoading && (indexPath.row >= (rowsLoaded! - rowsToLoadFromBottom))) {
            self.loadItems()
    }

    return cell
   }   

And loadItems() function:

   func loadItems() {
      isLoading = true
      urlEndpoint = "http://appurl.app/feed"

   if currentPage != 1 {
        currentPage = currentPage! + 1
        urlEndpoint = "http://appurl.app/feed?page=\(currentPage)"
        // print(urlEndpoint)
    }

   // Alamofire call.. {
       // Error handling

      // Got results {
             self.currentPage = json["current_page"].integer
             self.currentPage = self.currentPage + 1

             self.results = data
             self.tableView.reloadData()
          }
          self.isLoading = false
      }
   }

Update : I made it fetch properly. Now, I am seeing the links with page parameters on console. However, now it's loading all pages in a sudden (I have 6 pages, so 6 of them) so it doesn't really stop appending and I can actually see like a loop.

Update 2:

self.currentPage = json["current_page"].int!

if self.currentPage == 1 {
   self.results = data // data is json data fetched
   self.tableView.reloadData()
} else {
   var currentCount = self.results!.count;
   let indxesPath : [NSIndexPath] = [NSIndexPath]()

   for result in data {
      self.results?.append(result)
      currentCount++
   }

   self.tableView.insertRowsAtIndexPaths(indxesPath, withRowAnimation: UITableViewRowAnimation.Bottom)
   }                     
  self.currentPage = self.currentPage + 1
  }
  self.isLoading = false

But it's crashing on line self.tableView.insertRowsAtIndexPaths(indxesPath, withRowAnimation: UITableViewRowAnimation.Bottom)

The error: Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (40) must be equal to the number of rows contained in that section before the update (20), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).

Answer 1

I have found my answer in another SO question . Here it is applied to my scenario

if self.currentPage == 1 {
    self.results = data
    self.tableView.reloadData()
} else {
    var currentCount = self.results!.count;
    var indxesPath : [NSIndexPath] = [NSIndexPath]()

    for result in data {
       indxesPath.append(NSIndexPath(forRow:currentCount,inSection:0));
       self.results?.append(result)
       currentCount++
    }

    self.tableView.insertRowsAtIndexPaths(indxesPath, withRowAnimation: UITableViewRowAnimation.Bottom)
}