Tableview Pagination not working in swift - json

Question

I have added tableview bottom pagination with json data
json response in postman:
"result": {
"page_count": 3,
"per_page": 10,
"post_count": 27,
"Payments": [
{
"id": 132,
"payment_response": null,
code: if i run this code then without scrolling the paymentsServiceCall() calling 4 times but table data showing only first 10 records, why? where am i wrong.
i need initially 10 cells to show on tableview then if i scroll then 10 more cells to load and so on. please guide me
class MyPaymentsViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
private var currentPage = 1
private var totalPages = 1
private var paymentsData = PaymentsHistoryModel(dictionary: NSDictionary()) {
didSet {
totalPages = paymentsData?.result?.page_count ?? 0
tableView.reloadData()
}
}
override func viewWillAppear(_ animated: Bool) {
currentPage = 1
paymentsServiceCall()
}
func paymentsServiceCall() {
let param = ["page_no": currentPage]
serviceCall(param: param, method: .post, url: CommonUrl.student_my_payments) { [weak self] (resp) in
if let _ = resp.dict?["result"] as? NSDictionary {
self?.paymentsData = PaymentsHistoryModel(dictionary: resp.dict as NSDictionary? ?? NSDictionary())
}
}
}
}
extension MyPaymentsViewController: UITableViewDelegate, UITableViewDataSource {
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let totalPostCount = paymentsData?.result?.payments?.count
if indexPath.row == totalPostCount - 1, currentPage <= totalPages {
print("in refresh")
currentPage += 1
paymentsServiceCall()
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
paymentsData?.result?.payments?.count ?? 0
}
}

Answer 1

Try Using This
class PaginationManager {
var isLoading = false
static let shared = PaginationManager()
private init() { } //Singleton
}
extension PaginationManager {
func isPaging(_ scrollView: UIScrollView) -> Bool {
let offset = scrollView.contentOffset
let bounds = scrollView.bounds
let size = scrollView.contentSize
let inset = scrollView.contentInset
let y = offset.y + bounds.size.height - inset.bottom
let h = size.height
let reload_distance: CGFloat = 100.0
if y > h - reload_distance && !isLoading {
return true
}
return false
}
func isPagingForTopScroll(_ scrollView: UIScrollView) -> Bool {
let offset = scrollView.contentOffset
_ = scrollView.bounds
let size = scrollView.contentSize
_ = scrollView.contentInset
let y = offset.y
_ = size.height
let reload_distance: CGFloat = 100.0
if y < reload_distance && !isLoading {
return true
}
return false
}
}
And for using it in Controller
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if PaginationManager.shared.isPaging(scrollView) {
if !(paymentsData?.result?.payments?.isEmpty ?? true), totalPages > paymentsData?.result?.payments?.count ?? 0 {
guard PaginationManager.shared.isLoading else { return }
track("######Loading: \(viewModel.isLoading)")
//Call your service to fetch new data with an updated page number below
}
}
}
After calling the service again check for appending the data in payments or if it is the first page then replace it with new data and inside the service response update the current page count by 1
You can also create isLoading var in your class if multiple service calls are there.