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107 lines
3.6 KiB
107 lines
3.6 KiB
//
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// PagedView.swift
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// GME Remit
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//
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// Created by Armaan Shrestha on 21/08/2022.
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// Copyright © 2022 Gobal Money Express Co. Ltd. All rights reserved.
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//
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import UIKit
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protocol PagedViewDelegate: AnyObject {
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func didMoveToPage(index: Int)
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}
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class PagedView: UIView, UICollectionViewDelegateFlowLayout, UICollectionViewDataSource {
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// MARK: - Initialization
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init(pages: [UIView] = []) {
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self.pages = pages
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super.init(frame: .zero)
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self.setupUI()
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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// MARK: - Properties
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public weak var delegate: PagedViewDelegate?
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public var pages: [UIView] {
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didSet {
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self.collectionView.reloadData()
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}
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}
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private lazy var collectionView: UICollectionView = {
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let layout = UICollectionViewFlowLayout()
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layout.scrollDirection = .horizontal
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let collectionView = UICollectionView(
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frame: .zero,
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collectionViewLayout: layout
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)
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collectionView.showsHorizontalScrollIndicator = false
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collectionView.isPagingEnabled = true
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collectionView.register(PageCollectionViewCell.self, forCellWithReuseIdentifier: "PageCollectionViewCell")
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collectionView.delegate = self
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collectionView.dataSource = self
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collectionView.translatesAutoresizingMaskIntoConstraints = false
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return collectionView
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}()
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// MARK: - UI Setup
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func setupUI() {
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self.translatesAutoresizingMaskIntoConstraints = false
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self.addSubview(collectionView)
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collectionView.backgroundColor = .white
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NSLayoutConstraint.activate([
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collectionView.widthAnchor
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.constraint(equalTo: self.widthAnchor),
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collectionView.heightAnchor
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.constraint(equalTo: self.heightAnchor),
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collectionView.centerXAnchor
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.constraint(equalTo: self.centerXAnchor),
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collectionView.centerYAnchor
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.constraint(equalTo: self.centerYAnchor)
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])
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}
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// MARK: - Data Source
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func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
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return pages.count
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}
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func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
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let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PageCollectionViewCell", for: indexPath) as! PageCollectionViewCell
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let page = self.pages[indexPath.item]
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cell.view = page
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return cell
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}
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// MARK: - Actions
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public func moveToPage(at index: Int) {
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self.collectionView.scrollToItem(at: IndexPath(item: index, section: 0), at: .centeredHorizontally, animated: true)
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}
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// MARK: - Delegate
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func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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let page = Int(self.collectionView.contentOffset.x / self.collectionView.frame.size.width)
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self.delegate?.didMoveToPage(index: page)
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}
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// MARK: - Layout Delegate
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
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return CGSize(width: self.collectionView.frame.width,
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height: self.collectionView.frame.height)
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}
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func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
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return 0
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}
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}
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