marlonjames71

import Foundation

// This is so I didn't have to repeat myself for all of the for loops below.
extension FormatStyle where Self == IntegerFormatStyle<Int> {
    static func compactCount(significantDigits digits: Int = 3) -> Self {
        .number.precision(.significantDigits(digits)).notation(.compactName)
    }
}

// OR

marlonjames71

extension Collection {
    subscript (safe index: Index) -> Element? {
        return indices.contains(index) ? self[index] : nil
    }
}

func shorten(_ number: Int, afterDigitPlacement placement: Int = 3) -> String {
    let symbols = ["K", "M", "B"]
    let placementCount = String(number).count

marlonjames71

// Bigger iPhones = any Max, any Plus, iPhone XR, iPhone 11

switch (UITraitCollection.current.horizontalSizeClass, UITraitCollection.current.verticalSizeClass) {

    case (.compact, .compact):
    // Smaller iPhones in landscape

    case (.compact, .regular):
    // Bigger iPhones in portrait
    // iPads in portrait during any split screen,

marlonjames71

extension UIView {

    /// Sets `translatesAutoresizingMaskIntoConstraints` to false.
    ///
    ///     // Example Usage:
    ///
    ///     private lazy var captionLabel: UILabel = {
    ///         let label = UILabel().forAutoLayout()
    ///         label.text = viewModel.captionText
    ///         label.textAlignment = .center

marlonjames71

class PagedMediaViewController: UIPageViewController {

	// MARK: - Properties

	private var mediaItems: [MediaItem]
	private var currentIndex: Int


	// MARK: - Init

marlonjames71

extension PagedMediaViewController: UIPageViewControllerDelegate {
	
	func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) {
		guard
			let mediaVCs = pageViewController.viewControllers as? [MediaViewController],
			let currIndex = mediaItems.firstIndex(of: mediaVCs[0].mediaItem)
		else { return }

		currentIndex = currIndex
	}

marlonjames71

extension PagedMediaViewController: UIPageViewControllerDataSource {

	pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
		guard currentIndex > 0 else { return nil }
		return mediaViewControllerAtIndex(currentIndex - 1)
	}


	pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
		guard currentIndex < mediaItems.count - 1 else { return nil }

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override func viewDidLoad() {
	super.viewDidLoad()
	dataSource = self
	delegate = self
	
	if let firstMediaVC = mediaViewControllerAtIndex(currentIndex) {
		let viewControllers = [firstMediaVC]
		setViewControllers(viewControllers, direction: .forward, animated: false, completion: nil)
	}
}

marlonjames71

private func mediaViewControllerAtIndex(_ index: Int) -> MediaViewController? {
	// returns nil if the index is out of bounds, this way the app won't crash.
	// You can also put a print statement before you return.
	guard (0...mediaItems.count).contains(index) else { return nil }

	let item = mediaItems[index]

	switch item.mediaType {  
	case .video:  
		return VideoViewController(mediaItem: item)  

marlonjames71

// For one dimensional array
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
	let item = mediaItems[indexPath.item]
	let pagedMediaViewController = PagedMediaController(mediaItem: item, currentIndex: indexPath.item)
	pagedMediaViewController.modalPresentationStyle = .overFullScreen
	present(pagedMediaViewController, animated: true)
}

//	In case you're dealing with a two dimensional array like I was dealing with since the collection view's items
//	had sections