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ViewController.swift
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ViewController.swift
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//
// ViewController.swift
// PrettyConstraintsExamples
//
// Created by Hardik Parmar on 30/10/20.
//
import UIKit
import PrettyConstraints
import AVKit
class ViewController: UIViewController {
let containerView:UIView = {
let view = UIView()
return view
}()
lazy var collectionView:UICollectionView = {
let layout = UICollectionViewFlowLayout.init()
layout.scrollDirection = .vertical
layout.minimumLineSpacing = 10
layout.minimumInteritemSpacing = 0
layout.footerReferenceSize = .zero
layout.headerReferenceSize = .zero
let collectionView = UICollectionView.init(frame: .zero, collectionViewLayout: layout)
collectionView.isPagingEnabled = false
collectionView.isScrollEnabled = true
collectionView.backgroundColor = .white
collectionView.showsVerticalScrollIndicator = true
collectionView.showsHorizontalScrollIndicator = false
collectionView.register(VideoCollectionViewCell.self, forCellWithReuseIdentifier: "cell")
collectionView.delegate = self
collectionView.dataSource = self
return collectionView
}()
override func viewDidLoad() {
super.viewDidLoad()
self.setUpUI()
self.setUpDataSource()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.playFirstVisibleVideo()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.playFirstVisibleVideo(false)
}
func setUpUI() {
self.view.backgroundColor = .white
self.view.addSubview(containerView)
containerView.applyConstraints(.fitInSafeArea(self.view.safeAreaLayoutGuide))
containerView.addSubview(collectionView)
collectionView.applyConstraints(.fitInView(containerView))
}
var dataSource:[String] = []
func setUpDataSource() {
dataSource = [
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4",
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4",
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4",
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4",
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4",
"https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4"
]
collectionView.reloadData()
}
}
extension ViewController: UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return dataSource.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as? VideoCollectionViewCell else {
return UICollectionViewCell()
}
cell.configure(dataSource[indexPath.item])
return cell
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.frame.width, height: 240)
}
}
extension ViewController: UIScrollViewDelegate {
func scrollViewDidScroll(_ scrollView: UIScrollView) {
playFirstVisibleVideo()
}
}
extension ViewController {
func playFirstVisibleVideo(_ shouldPlay:Bool = true) {
// 1.
let cells = collectionView.visibleCells.sorted {
collectionView.indexPath(for: $0)?.item ?? 0 < collectionView.indexPath(for: $1)?.item ?? 0
}
// 2.
let videoCells = cells.compactMap({ $0 as? VideoCollectionViewCell })
if videoCells.count > 0 {
// 3.
let firstVisibileCell = videoCells.first(where: { checkVideoFrameVisibility(ofCell: $0) })
// 4.
for videoCell in videoCells {
if shouldPlay && firstVisibileCell == videoCell {
videoCell.play()
}
else {
videoCell.pause()
}
}
}
}
func checkVideoFrameVisibility(ofCell cell: VideoCollectionViewCell) -> Bool {
var cellRect = cell.containerView.bounds
cellRect = cell.containerView.convert(cell.containerView.bounds, to: collectionView.superview)
return collectionView.frame.contains(cellRect)
}
}