I would like to load data from the server upon scrolling down to index 5 within a page (i.e. 5, 15, 25, etc) in the background in order to make it appear the tableview is scrolling continuously without freezing the UI. I tried the method below to load the next page if the index is a multiple of 5 and not even, but I'm finding it's not working effectively.
Below you can see how I try to load more data once we reach a specific index.
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if indexPath.row % 2 != 0 && indexPath.row % 5 == 0 {
currentPgNum = currentPgNum! + 1
self.loadMore()
}
}
Below you can see my request to the server to load more data.
func loadMore () {
guard !self.reachedEndOfItems else {
return
}
self.offset = self.offset! + 10
print("load more offset: \(self.offset)")
var start = 0
var end = 0
isPullToRefresh = false
let userCreds = UserDefaults.standard
var getReqString = ""
if userCreds.bool(forKey: "client_journal") == true || userCreds.bool(forKey: "user_journal") == true {
var pageNum = ""
if let pgNum = currentPgNum {
print(pgNum)
pageNum = String(pgNum)
}
var filterEntryType = ""
if let entryTypeStr = filtEntryType {
filterEntryType = entryTypeStr
}
var filterUserId = ""
if let userId = filtUserId {
filterUserId = userId
}
getReqString = "https://gethealthie.com/selected_entries.json?page=\(pageNum)&user_id=\(filterUserId)&entry_type=\(filterEntryType)&entry_filter="
} else {
if let pgNum = currentPgNum {
print(pgNum)
getReqString = "https://gethealthie.com/entries.json?page=\(pgNum)"
}
}
DispatchQueue.global(qos: .background).async {
BXProgressHUD.showHUDAddedTo(self.view)
let request = Alamofire.request(getReqString, method: .get, headers: [
"access-token": userCreds.object(forKey: "access-token")! as! String,
"client": userCreds.object(forKey: "client")! as! String,
"token-type": userCreds.object(forKey: "token-type")! as! String,
"uid": userCreds.object(forKey: "uid")! as! String,
"expiry": userCreds.object(forKey: "expiry")! as! String
]).responseJSON { (response:DataResponse<Any>) in
print(response.response)
let json = JSON(data: response.data!)
print(json)
print("yes")
print(json.count)
if userCreds.bool(forKey: "client_journal") == true || userCreds.bool(forKey: "user_journal") == true {
self.totalEntries = json["entries"].count
let totalEntryCount = json["entries"].count
start = 0
end = totalEntryCount
} else {
self.totalEntries = json["entries"].count
let totalEntryCount = json["entries"].count
start = 0
end = totalEntryCount
}
if self.totalEntries == 0 {
BXProgressHUD.hideHUDForView(self.view);
} else if end <= self.totalEntries {
var jourIdx = 0
let newPatient = Patient()
let newDietitian = Dietitian()
for i in start ..< end {
let allEntries = json["entries"]
print(allEntries)
print("Entry count in loadMore is \(allEntries.count)")
let entry = allEntries[i]
print(entry)
let category = entry["category"]
print(category)
let name = entry["entry_comments"]
let k = name["id"]
var indexStr = String(i)
//entry attributes
self.jsonIdx.add(indexStr)
self.type.add(entry["type"].stringValue)
self.desc.add(entry["description"].stringValue)
self.category.add(entry["category"].stringValue)
//food cell- metric stat == healthy int
self.metric_stat.add(entry["metric_stat"].stringValue)
self.dateCreate.add(entry["created_at"].stringValue)
self.viewed.add(entry["viewed"].stringValue)
self.seenStatusArr.add(entry["viewed"].stringValue)
self.comments.add(entry["entry_comments"].rawValue)
self.entryType.add(entry["category"].stringValue)
// "category" : entryType as AnyObject]
let posterInfo = entry["poster"]
let first = posterInfo["first_name"].stringValue
let last = posterInfo["last_name"].stringValue
let full = first + " " + last
self.captionName.add(full)
//food cell subcat
self.hungerInt.add(entry["percieved_hungriness"].stringValue)
self.prehunger.add(entry["ed_prehunger_string"].stringValue)
self.posthunger.add(entry["ed_posthunger_string"].stringValue)
self.emotions.add(entry["emotions_string"].stringValue)
self.reflection.add(entry["reflection"].stringValue)
print(self.comments)
self.id.add(entry["id"].stringValue)
self.entryImages.add(entry["image_url"].stringValue)
if i == end - 1 {
userCreds.set(json.count, forKey: "oldJsonCount")
DispatchQueue.main.async {
self.tableView.reloadData()
BXProgressHUD.hideHUDForView(self.view)
}
}
}
} else {
var reachedEndOfItems = true
BXProgressHUD.hideHUDForView(self.view);
print("reached the end")
}
}
}
Any ideas?
