I am new to swift iOS and I just wanna ask if there is a way to like remove or deallocate a page after being swiped because it's eating up too much ram every time I swipe to the next page. I am working on 64 pages so if I don't apply deallocation then the app might freeze or crash.
ViewController.swift
import UIKit
class ViewController: UIViewController, UIPageViewControllerDataSource {
// MARK: - Variables
private var pageViewController: UIPageViewController?
// Initialize it right away here
private var contentImages = [
"CQ print version_Page_1.jpg",
"CQ print version_Page_2.jpg",
"CQ print version_Page_3.jpg",
"CQ print version_Page_4.jpg",
"CQ print version_Page_5.jpg",
"CQ print version_Page_6.jpg",
"CQ print version_Page_7.jpg",
"CQ print version_Page_8.jpg",
"CQ print version_Page_9.jpg",
"CQ print version_Page_10.jpg",
"CQ print version_Page_11.jpg",
"CQ print version_Page_12.jpg",
"CQ print version_Page_13.jpg",
"CQ print version_Page_14.jpg",
"CQ print version_Page_15.jpg",
"CQ print version_Page_16.jpg",
"CQ print version_Page_17.jpg",
"CQ print version_Page_18.jpg",
"CQ print version_Page_19.jpg",
"CQ print version_Page_20.jpg",
"CQ print version_Page_21.jpg",
"CQ print version_Page_22.jpg",
"CQ print version_Page_23.jpg",
"CQ print version_Page_24.jpg",
"CQ print version_Page_25.jpg",
"CQ print version_Page_26.jpg",
"CQ print version_Page_27.jpg",
"CQ print version_Page_28.jpg",
"CQ print version_Page_29.jpg",
"CQ print version_Page_30.jpg",
"CQ print version_Page_31.jpg",
"CQ print version_Page_32.jpg",
"CQ print version_Page_33.jpg",
"CQ print version_Page_34.jpg",
"CQ print version_Page_35.jpg",
"CQ print version_Page_36.jpg",
"CQ print version_Page_37.jpg",
"CQ print version_Page_38.jpg",
"CQ print version_Page_39.jpg",
"CQ print version_Page_40.jpg",
"CQ print version_Page_41.jpg",
"CQ print version_Page_42.jpg",
"CQ print version_Page_43.jpg",
"CQ print version_Page_44.jpg",
"CQ print version_Page_45.jpg",
"CQ print version_Page_46.jpg",
"CQ print version_Page_47.jpg",
"CQ print version_Page_48.jpg",
"CQ print version_Page_49.jpg",
"CQ print version_Page_50.jpg",
"CQ print version_Page_51.jpg",
"CQ print version_Page_52.jpg",
"CQ print version_Page_53.jpg",
"CQ print version_Page_54.jpg",
"CQ print version_Page_55.jpg",
"CQ print version_Page_56.jpg",
"CQ print version_Page_57.jpg",
"CQ print version_Page_58.jpg",
"CQ print version_Page_59.jpg",
"CQ print version_Page_60.jpg",
"CQ print version_Page_61.jpg",
"CQ print version_Page_62.jpg",
"CQ print version_Page_63.jpg",
"CQ print version_Page_64.jpg"];
//var contentImages = [String]()
// MARK: - View Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
createPageViewController()
setupPageControl()
}
private func createPageViewController() {
let pageController = self.storyboard!.instantiateViewControllerWithIdentifier("PageController") as! UIPageViewController
pageController.dataSource = self
if contentImages.count > 0 {
let firstController = getItemController(0)!
let startingViewControllers: NSArray = [firstController]
pageController.setViewControllers(startingViewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: false, completion: nil)
}
pageViewController = pageController
addChildViewController(pageViewController!)
self.view.addSubview(pageViewController!.view)
pageViewController!.didMoveToParentViewController(self)
}
private func setupPageControl() {
let appearance = UIPageControl.appearance()
appearance.pageIndicatorTintColor = UIColor.grayColor()
appearance.currentPageIndicatorTintColor = UIColor.whiteColor()
appearance.backgroundColor = UIColor.darkGrayColor()
}
// MARK: - UIPageViewControllerDataSource
func pageViewController(pageViewController: UIPageViewController, viewControllerBeforeViewController viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! PageItemController
if itemController.itemIndex > 0 {
return getItemController(itemController.itemIndex-1)
}
return nil
}
func pageViewController(pageViewController: UIPageViewController, viewControllerAfterViewController viewController: UIViewController) -> UIViewController? {
let itemController = viewController as! PageItemController
if itemController.itemIndex+1 < contentImages.count {
return getItemController(itemController.itemIndex+1)
}
return nil
}
private func getItemController(itemIndex: Int) -> PageItemController? {
if itemIndex < contentImages.count {
let pageItemController = self.storyboard!.instantiateViewControllerWithIdentifier("ItemController") as! PageItemController
pageItemController.itemIndex = itemIndex
pageItemController.imageName = contentImages[itemIndex]
return pageItemController
}
return nil
}
// MARK: - Page Indicator
func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
return contentImages.count
}
func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
return contentImages.count
}
}
PageItemController.swift
import UIKit
class PageItemController: UIViewController {
// MARK: - Variables
var itemIndex: Int = 0
var imageName: String = "" {
didSet {
if let imageView = contentImageView {
imageView.image = UIImage(named: imageName)
}
}
}
@IBOutlet var contentImageView: UIImageView?
// MARK: - View Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
contentImageView!.image = UIImage(named: imageName)
}
}
If this memory issue is related to images then,
As the documentation says:
So instead of using
you should use
For more memory management concept you can refer this link : Swift Managing Memory