Handling Data between ViewControllers in SJSegmentedViewController - ios

Question

I am using library SJSegmentedViewController for my project, github link to pod
Problem:
I have main view controller (FilterVC) on which I have a button "APPLY", on its action I want to access an array stored in another viewcontroller (FilterSkillVC), I am doing this using delegation, but still what I get is an empty instance
UPDATED
MY FilterVC code
import UIKit
import SJSegmentedScrollView
protocol FilterVCDelegate {
func btnApply()
}
class FilterVC: UIViewController {
var selectedSegment: SJSegmentTab?
var segmentedVC : SJSegmentedViewController?
var vcDelegate : FilterVCDelegate?
#IBOutlet weak var containerView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
segmentViewInitialization()
}
#IBAction func btnApply(_ sender: Any) {
vcDelegate?.btnApply()
}
}
extension FilterVC {
var titles: [String] {
return [SegmentTitles.skillSet.rawValue,
SegmentTitles.cuisines.rawValue,
SegmentTitles.others.rawValue ]
}
var tabs: [String] {
return [StoryboardId.skillSet.rawValue,
StoryboardId.skillSet.rawValue,
StoryboardId.others.rawValue ]
}
func segmentViewInitialization() {
segmentedVC = CSSegment.setupTabs(storyboard: self.storyboard, tabs: tabs, titles: titles) as? SJSegmentedViewController
segmentedVC?.delegate = self
segmentedVC?.selectedSegmentViewHeight = 2.0
segmentedVC?.segmentTitleColor = .white
segmentedVC?.selectedSegmentViewColor = AppColor.secondary.value
segmentedVC?.segmentBackgroundColor = AppColor.primary.value
segmentedVC?.segmentViewHeight = 64.0
segmentedVC?.segmentShadow = SJShadow.light()
segmentedVC?.segmentTitleFont = AppFont.avenirMedium.size(14.0)
containerView.addSubview((segmentedVC?.view)!)
segmentedVC?.view.frame = containerView.bounds
}
}
extension FilterVC: SJSegmentedViewControllerDelegate {
func didMoveToPage(_ controller: UIViewController, segment: SJSegmentTab?, index: Int) {
if index != tabs.count-1 {
let filterVC = controller as! FilterSkillVC
filterVC.updateCurrentHeader(currentTab:SegmentTitles(rawValue: titles[index])!)
}
if selectedSegment != nil {
selectedSegment?.titleColor(.white)
}
if (segmentedVC?.segments.count)! > 0 {
selectedSegment = segmentedVC?.segments[index]
selectedSegment?.titleColor(AppColor.secondary.value)
}
}
}
My Skill VC code
import UIKit
class FilterSkillVC: UIViewController {
#IBOutlet var tblView: UITableView!
var instance = FilterVC()
lazy var arraySkills = [JSTags]()
lazy var arrayCuisines = [JSTags]()
var arrayID = [String]()
var currentHeader: SegmentTitles = .skillSet
override func viewDidLoad() {
super.viewDidLoad()
apiSkillCall()
apiCuisineCall()
registerCell(cellId: .filterListCell, forTableView: tblView)
tblView.tableFooterView = UIView()
// let instance = FilterVC()
instance.vcDelegate = self
}
func updateCurrentHeader(currentTab : SegmentTitles){
currentHeader = currentTab
tblView.reloadData()
}
//MARK: ----- Custom Methods
func countForHeader() -> NSInteger {
switch currentHeader {
case .skillSet:
return arraySkills.count
case .cuisines:
return arrayCuisines.count
default:
return 0
}
}
func titleForHeader(_ index: NSInteger) -> (name: String?, obj: AnyObject?) {
switch currentHeader {
case .skillSet:
return (name: arraySkills[index].name, obj: arraySkills[index])
case .cuisines:
return (name: arrayCuisines[index].name, obj: arrayCuisines[index])
default:
return (name: nil, obj: nil)
}
}
//MARK: ----- Handle Response Methods
func handleSkillsResponse(response: Response) {
switch response{
case .success(let response):
if let skills = response as? [JSTags] {
self.arraySkills = skills
}
case .failure(let str):
Alerts.shared.show(alert: .oops, message: /str, type: .error)
case .dataNotExist(let str):
Alerts.shared.show(alert: .oops, message: str, type: .info)
}
tblView.reloadData()
}
func handleCuisineResponse(response: Response) {
switch response{
case .success(let response):
if let cuisines = response as? [JSTags] {
self.arrayCuisines = cuisines
tblView.reloadData()
}
case .failure(let str):
Alerts.shared.show(alert: .oops, message: /str, type: .error)
case .dataNotExist(let str):
Alerts.shared.show(alert: .oops, message: str, type: .info)
}
}
//MARK: API Methods
func apiSkillCall() {
APIManager.shared.request(with: ProfileEndPoint.fetchSkills()) { (response) in
self.handleSkillsResponse(response: response)
}
}
func apiCuisineCall() {
APIManager.shared.request(with: ProfileEndPoint.fetchCuisines()) { (response) in
self.handleCuisineResponse(response: response)
}
}
}
extension FilterSkillVC : UITableViewDelegate, UITableViewDataSource, FilterListCellDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return countForHeader()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: CellIdentifiers.filterListCell.rawValue) as! FilterListCell
let filter = titleForHeader(indexPath.row)
cell.lblFilterLabel.text = filter.name
//Mark: Cell delegate
cell.delegate = self
return cell
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 70
}
//Mark: FilterCellDelegate Method
func buttonTapped(cell: FilterListCell) {
if let indexPath = self.tblView.indexPath(for: cell) {
print("Button tapped on row \(indexPath.row)")
if currentHeader == .skillSet {
arraySkills[indexPath.row].isSelected = !arraySkills[indexPath.row].isSelected
}
else {
arrayCuisines[indexPath.row].isSelected = !arrayCuisines[indexPath.row].isSelected
}
}
}
}
extension FilterSkillVC : FilterVCDelegate {
func btnApply() {
for object in arraySkills {
if object.isSelected {
arrayID.append((object.id) ?? "")
}
}
for object in arrayCuisines {
if object.isSelected {
arrayID.append((object.id) ?? "")
}
}
}
}

Answer 1

You are losing the reference to the instance as soon as the viewDidLoad method is completed.
Make instance a global Variable.
Like so :
import UIKit
class FilterSkillVC: UIViewController {
#IBOutlet var tblView: UITableView!
var instance = FilterVC() //New line added here.
lazy var arraySkills = [JSTags]()
lazy var arrayCuisines = [JSTags]()
var arrayID = [String]()
var currentHeader: SegmentTitles = .skillSet
override func viewDidLoad() {
super.viewDidLoad()
apiSkillCall()
apiCuisineCall()
registerCell(cellId: .filterListCell, forTableView: tblView)
tblView.tableFooterView = UIView()
//let instance = FilterVC() //Commented this.
instance.vcDelegate = self
}
More updates :
In the didMoveToPage method, you are getting a reference to a FilterVC (from a storyboard ??), now this instance of FilterVC is different from the instance of filterVC we created.
Please add this change and try :
func didMoveToPage(_ controller: UIViewController, segment: SJSegmentTab?, index: Int) {
if index != tabs.count-1 {
let filterVC = controller as! FilterSkillVC
filterVC.updateCurrentHeader(currentTab:SegmentTitles(rawValue: titles[index])!)
self.vcDelegate = filterVC // <== Updated this line.
}