index out of range on didSelectRow in updateSearchResults method

Question

I'm displaying user profiles as search results in another view controller so that on selecting a cell the user gets followed. I load the results from updateSearchResults method and it loads well but when I select the row to follow that user sometimes it throws an error, Fatal error: Index out of range.

my code :

func updateSearchResults(for searchController: UISearchController) {
    self.chooseResultsTableController.reloadData()
    let ref = Database.database().reference()
            let queryRef : DatabaseQuery
            let lastUser = self.resultsUsers.last

            guard searchController.searchBar.text != "" else {
                return
            }

            queryRef = ref.child("users").queryOrdered(byChild: "full Name").queryStarting(atValue: searchController.searchBar.text).queryEnding(atValue: searchController.searchBar.text!+"\u{f8ff}").queryLimited(toLast: 20)

            SVProgressHUD.show()
            var tempUsers2 = [user]()
            queryRef.observeSingleEvent(of: .value, with: { snapshot in

                for snap in snapshot.children {
                let userSnap = snap as! DataSnapshot
                let userKey = userSnap.key
                let userDict = userSnap.value as! [String:AnyObject]
                let aUser = user()

                    aUser.fullName = userDict["full Name"] as? String
                    let joinedSince = userDict["dateJoined"] as! Double
                    aUser.ImagePath = userDict["urlToImage"] as? String
                    aUser.about = userDict["about"] as? String
                    if let FollowingCount = userDict["followers"] as? [String : String] {
                        aUser.followers = FollowingCount.values.count
                    }

                    aUser.userId = userKey

                    let sensibleDate = joinedSince / 1000
                    let date = Date(timeIntervalSince1970: sensibleDate)
                    var finalString = String()
                    let secondsAgo = Int(Date().timeIntervalSince(date))
                    let minute = 60
                    let hour = 60 * minute
                    let day = 24 * hour
                    let week = 7 * day
                    if secondsAgo < minute {
        //                      finalString = "\(secondsAgo) Just now"
                        finalString = "Just now"
                    } else if secondsAgo < hour {
                        finalString = "\(secondsAgo / minute) minutes ago"
                    } else if secondsAgo < day {
                        finalString = "\(secondsAgo / hour) hours ago"
                    } else if secondsAgo < week {
                        finalString = "\(secondsAgo / day) days ago"
                    } else {
                        finalString = "\(secondsAgo / week) weeks ago"
                    }
                    aUser.joinedSince = finalString
                    aUser.untouchedDate = joinedSince

                        if userKey != lastUser?.userId {
                            tempUsers2.insert(aUser, at: 0)
                            print(tempUsers2)
    //                        self.users.removeAll()
                            print("\(self.resultsUsers.count) number of users")
                        }
                    }
                    SVProgressHUD.dismiss()
                    self.resultsUsers = tempUsers2
                    self.chooseResultsTableController.reloadData()
                })

}

Also, when I search with different keywords so that the table view data changes, the error seems to be guaranteed upon selection on the cell :(

the error code :

func checkFollowing(indexPath : IndexPath)  {

    let uid = Auth.auth().currentUser?.uid
    let ref = Database.database().reference()

    ref.child("users").child(uid!).child("following").queryOrderedByKey().observe(.value) { (snapshot) in
        if let following = snapshot.value as? [String : AnyObject] {
            for (_ , value) in following {
            if value as? String == self.resultsUsers[indexPath.row].userId {
                self.chooseResultsTableController.cellForRow(at: indexPath)?.accessoryType = .checkmark
            }

          }

        }

    }
}

you need o safety to unwrap your optionals to avoid the crash. Check this answer https://stackoverflow.com/questions/25195565/how-do-you-unwrap-swift-optionals — Toto, Mar 27 '20 at 10:41
@ Toto I tried running after correcting the optionals but still, that error — mac, Mar 27 '20 at 10:52
you get **Index out of range**, try checking first if the array has that index before accessing it. check **index < array.count** — Toto, Mar 27 '20 at 10:54
@Toto It is not returning an index for some cases but still trying to figure out whyy — mac, Mar 27 '20 at 11:12

score 0 · Answer 1 · answered Mar 27 '20 at 15:02

The error means that you try to access an array element not exists. for example, if your array size is 4, you try to access array[10]. I can't catch where exactly do you make it happens. But you should reload your tableview data anywhere you change its data source array size

index out of range on didSelectRow in updateSearchResults method

1 Answers1