UISegmented Control Inner view should call API after view has been shown - ios

Question

I have a 'UISegmentedControl' which is programatically added in the view controller named SegmentControllForRides. (i added UISegmentedControl programatically because segment items will be changed some time 2 or 3.UISegmentedControl have three items. items names are ["Request","Upcoming", "Past"]. Each segment will show a viewController.view and hide the others. Each view controller have an API call. My problem is when first the SegmentControllForRides shows it calls the all three (child) viewcontroller API's( i think because views are hidden but loaded in controller thats why API calls goes to server). Each view controller has a UITableView and in UITableViewCell there is a UICollectionView. I tried to call (again) API when view is shown, in that case API call goes but UICollectionView got messed. It shows data of the other cell. For this i tried to
DispatchQueue.main.async {
reloadCollectionView()
}
but this does not help.
I want to call API when child view is shown (not on the SegmentControllForRides load). It is also necessary because first controller API response have the effect of the second controller API call. So Kindly guide me how to call API after the view shown.
I will try provide any further detail.
Here is my class.
import UIKit
class SegmentControllForRides: UIViewController {
// MARK: - Variables
var controller: UIViewController!
var requestedRideViewController: RequestedRideViewController!
var upcomingRideViewController: UpcomingRideViewController!
var myRideViewControllerUpcoming: UIViewController!
var myRideViewControllerPast: UIViewController!
var segmentControll: UISegmentedControl!
var sideMenuOpen = false
// MARK: - Outlets
// MARK: - Life Cycle
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
configure()
}
override func viewWillDisappear(_ animated: Bool) {
if sideMenuOpen {
openCloseSideMenu()
}
}
// MARK: - Actions & Events
#IBAction func segmentControllChanged(_ sender: UISegmentedControl) {
if UserDefaults.standard.bool(forKey: User.isAppUsingAsPassenger) {
switch segmentControll.selectedSegmentIndex {
case 0:
print("segment 1")
myRideViewControllerUpcoming.view.isHidden = false
myRideViewControllerUpcoming.didMove(toParent: self)
myRideViewControllerPast.view.isHidden = true
case 1:
print("segment 2")
myRideViewControllerUpcoming.view.isHidden = true
myRideViewControllerPast.view.isHidden = false
myRideViewControllerPast.didMove(toParent: self)
default:
break
}
} else {
switch segmentControll.selectedSegmentIndex {
case 0:
print("segment 1")
requestedRideViewController.view.isHidden = false
requestedRideViewController.didMove(toParent: self)
upcomingRideViewController.view.isHidden = true
myRideViewControllerPast.view.isHidden = true
case 1:
print("segment 2")
requestedRideViewController.view.isHidden = true
upcomingRideViewController.view.isHidden = false
// upcomingRideViewController.getUpcomingRide()
upcomingRideViewController.didMove(toParent: self)
myRideViewControllerPast.view.isHidden = true
// let myClass : UpcomingRideViewController = self.children[1] as! UpcomingRideViewController
// myClass.myRideTableView.reloadData()
// myClass.getUpcomingRide()
// myClass.viewWillAppear(false)
case 2:
print("Segment 3")
requestedRideViewController.view.isHidden = true
upcomingRideViewController.view.isHidden = true
myRideViewControllerPast.view.isHidden = false
myRideViewControllerPast.didMove(toParent: self)
default:
break
}
}
}
#IBAction func sideMenuClicked(_ sender: UIBarButtonItem) {
openCloseSideMenu()
}
#objc func handleGesture(gesture: UISwipeGestureRecognizer) -> Void {
if gesture.direction == .right {
print("Swipe Right")
if !sideMenuOpen {
openCloseSideMenu()
}
} else if gesture.direction == .left {
print("Swipe Left")
if sideMenuOpen {
openCloseSideMenu()
}
}
}
// MARK: - Helper Methods
private func configure() {
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeLeft.direction = .left
self.view.addGestureRecognizer(swipeLeft)
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(handleGesture))
swipeRight.direction = .right
self.view.addGestureRecognizer(swipeRight)
controller = storyboard!.instantiateViewController(withIdentifier: "SideMenuViewController")
if UserDefaults.standard.bool(forKey: User.isAppUsingAsPassenger) {
let segmentItems = ["Upcoming", "Past"]
segmentControll = UISegmentedControl(items: segmentItems)
segmentControll.frame = CGRect(x:0 ,y: 0, width: view.frame.width, height: 30)
segmentControll.addTarget(self, action: #selector(segmentControllChanged), for: .valueChanged)
segmentControll.selectedSegmentIndex = 0
segmentControll.backgroundColor = .rideelyGray
if #available(iOS 13.0, *) {
segmentControll.selectedSegmentTintColor = .rideelyYellow
} else {
// Fallback on earlier versions
}
view.addSubview(segmentControll)
myRideViewControllerUpcoming = storyboard!.instantiateViewController(withIdentifier: "MyRideViewController")
addChild(myRideViewControllerUpcoming)
myRideViewControllerUpcoming.view.frame = CGRect(x: 0, y: 30, width: view.frame.width, height: view.frame.height - 30) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(myRideViewControllerUpcoming.view)
myRideViewControllerUpcoming.didMove(toParent: self)
myRideViewControllerUpcoming.view.frame = CGRect(x: 0 - self.view.frame.width, y: 30, width: view.frame.width, height: view.frame.height - 30)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.myRideViewControllerUpcoming.view.frame = CGRect(x: 0, y: 30, width: self.view.frame.width, height: self.view.frame.height - 30)
}, completion:nil)
myRideViewControllerUpcoming.view.isHidden = false
myRideViewControllerPast = storyboard!.instantiateViewController(withIdentifier: "MyRideViewController")
addChild(myRideViewControllerPast)
myRideViewControllerPast.view.frame = CGRect(x: 0, y: 30, width: view.frame.width, height: view.frame.height - 30) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(myRideViewControllerPast.view)
myRideViewControllerPast.didMove(toParent: self)
myRideViewControllerPast.view.frame = CGRect(x: 0 - self.view.frame.width, y: 30, width: view.frame.width, height: view.frame.height - 30)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.myRideViewControllerPast.view.frame = CGRect(x: 0, y: 30, width: self.view.frame.width, height: self.view.frame.height - 30)
}, completion:nil)
myRideViewControllerPast.view.isHidden = true
} else {
let segmentItems = ["Request","Upcoming", "Past"]
segmentControll = UISegmentedControl(items: segmentItems)
segmentControll.frame = CGRect(x:0 ,y: 0, width: view.frame.width, height: 30)
segmentControll.addTarget(self, action: #selector(segmentControllChanged), for: .valueChanged)
segmentControll.selectedSegmentIndex = 0
segmentControll.backgroundColor = .rideelyGray
if #available(iOS 13.0, *) {
segmentControll.selectedSegmentTintColor = .rideelyYellow
} else {
// Fallback on earlier versions
}
view.addSubview(segmentControll)
requestedRideViewController = (storyboard!.instantiateViewController(withIdentifier: "RequestedRideViewController") as! RequestedRideViewController)
addChild(requestedRideViewController)
requestedRideViewController.view.frame = CGRect(x: 0, y: 30, width: view.frame.width, height: view.frame.height) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(requestedRideViewController.view)
requestedRideViewController.didMove(toParent: self)
requestedRideViewController.view.frame = CGRect(x: 0 - self.view.frame.width, y: 30, width: view.frame.width, height: view.frame.height)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.requestedRideViewController.view.frame = CGRect(x: 0, y: 30, width: self.view.frame.width, height: self.view.frame.height - 30)
}, completion:nil)
requestedRideViewController.view.isHidden = false
upcomingRideViewController = (storyboard!.instantiateViewController(withIdentifier: "UpcomingRideViewController") as! UpcomingRideViewController)
addChild(upcomingRideViewController)
upcomingRideViewController.view.frame = CGRect(x: 0, y: 30, width: view.frame.width, height: view.frame.height - 30) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(upcomingRideViewController.view)
upcomingRideViewController.didMove(toParent: self)
upcomingRideViewController.view.frame = CGRect(x: 0 - self.view.frame.width, y: 30, width: view.frame.width, height: view.frame.height)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.upcomingRideViewController.view.frame = CGRect(x: 0, y: 30, width: self.view.frame.width, height: self.view.frame.height - 30)
}, completion:nil)
upcomingRideViewController.view.isHidden = true
myRideViewControllerPast = storyboard!.instantiateViewController(withIdentifier: "MyRideViewController")
addChild(myRideViewControllerPast)
myRideViewControllerPast.view.frame = CGRect(x: 0, y: 30, width: view.frame.width, height: view.frame.height - 30) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(myRideViewControllerPast.view)
myRideViewControllerPast.didMove(toParent: self)
myRideViewControllerPast.view.frame = CGRect(x: 0 - self.view.frame.width, y: 30, width: view.frame.width, height: view.frame.height - 30)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.myRideViewControllerPast.view.frame = CGRect(x: 0, y: 30, width: self.view.frame.width, height: self.view.frame.height - 30)
}, completion:nil)
myRideViewControllerPast.view.isHidden = true
}
}
private func openCloseSideMenu() {
if sideMenuOpen {
sideMenuOpen = false
controller.removeFromParent()
controller.view.removeFromSuperview()
} else {
sideMenuOpen = true
addChild(controller)
controller.view.frame = CGRect(x: 0, y: 0, width: view.frame.width * 0.8, height: view.frame.height) // or, better, turn off `translatesAutoresizingMaskIntoConstraints` and then define constraints for this subview
view.addSubview(controller.view)
controller.didMove(toParent: self)
controller.view.frame = CGRect(x: 0 - self.view.frame.width, y: 0, width: view.frame.width * 0.8, height: view.frame.height)
UIView.animate(withDuration: 0.3, animations: { () -> Void in
self.controller.view.frame = CGRect(x: 0, y: 0, width: self.view.frame.width * 0.8, height: self.view.frame.height)
}, completion:nil)
}
}
}

Answer 1

You need to configure your api calls in segmentControllChanged, there are many ways you can achieve this . One way that will best suit is
You can use flag for each controller to check when the segment is scrolled then only you hit the api explicitly otherwise don't hit it.
1 example for this
CODE -
switch segmentControll.selectedSegmentIndex {
case 1:
print("segment 1")
myRideViewControllerUpcoming.isVisible = true
// call your myRideViewControllerUpcoming api method here
}