Cache videos in view controller using plugin - ios

Question

I started learning swift a few weeks ago and I am now moving on to something a little trickier: I would like to build a simple app which uses a UIPageViewController. Each page shall contain a video which is loaded from a server using a plugin called Player. Since I want individual videos to be player on the pages, I use an array which stores all the URLs. These URLs are then used to set a value in another class. If the value in this class was set (didSet), I load the video using the plugin. All that works perfectly fine! To get an idea of what I did you can click this link to this youtube tutorial which I used as an orientation.
However, I encountered a problem which I had already suspected: The videos are reloaded whenever one hits a page one has already been on and the video has already been loaded on once. Obviously, I don't want the videos to reload every time which is why I looked for a caching library for swift under awesome-swift. The first one suggested (HanekeSwift) somehow didn't work for me and gave me a bunch of errors every time I tried to include it. Thus, I tried to approach my problem using the second option provided: Carlos which didn't cause any errors (which is a library by a German news agency so it sounds and also looks very professional). Nevertheless, as I am quite new to swift, I cannot quite put my finger on this plugin. I don't understand a lot of things since I am quite new...
What would I have to add to my code to cache the videos? Do I need to create another class for that? How would you recommend me to do it? I'll provide what i have till now below... And sorry for the long (and newby) question but I really couldn't figure it out.
Code
PageViewController
//viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
//set datasourcee to self for now
dataSource = self
view.backgroundColor = .white
let postViewController = PostViewController()
postViewController.video = videos.first
let viewControllers = [postViewController]
//set first view controller
setViewControllers(viewControllers, direction: .forward, animated: true, completion: nil)
}
//videos array
let videos = ["https://link.to/testvideo.mov", "https://link.to/testvideo.mov", "https://link.to/testvideo.mov", "https://link.to/testvideo.mov"]
//after page
func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
let currentIndexString = (viewController as! PostViewController).index
let currentIndex = indec.index(of: currentIndexString!)
//next page possible?
if currentIndex! < indec.count - 1 {
let postViewController = PostViewController()
postViewController.video = videos[currentIndex! + 1]
return postViewController
}
return nil
}
//before page
func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
let currentIndexString = (viewController as! PostViewController).index
let currentIndex = indec.index(of: currentIndexString!)
//previous page possible?
if currentIndex! > 0 {
//template
let postViewController = PostViewController()
postViewController.video = videos[currentIndex! - 1]
return postViewController
}
return nil
}
PostViewController
var video:String? {
didSet {
print(video ?? String())
setupPlayer()
}
}
//orienting myself by the example provided by "Player" plugin from here on (https://github.com/piemonte/Player/blob/master/Project/Player/ViewController.swift)
fileprivate var player = Player()
deinit {
self.player.willMove(toParentViewController: self)
self.player.view.removeFromSuperview()
self.player.removeFromParentViewController()
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .blue
}
func setupPlayer() {
self.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
self.player.playerDelegate = self as? PlayerDelegate
self.player.playbackDelegate = self as? PlayerPlaybackDelegate
self.player.view.frame = self.view.bounds
self.addChildViewController(self.player)
self.view.addSubview(self.player.view)
self.player.didMove(toParentViewController: self)
self.player.url = URL(string: video!)
self.player.playbackLoops = true
}