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9bc996374f
git-subtree-dir: submodules/AsyncDisplayKit git-subtree-mainline: d06f423e0ed3df1fed9bd10d79ee312a9179b632 git-subtree-split: 02bedc12816e251ad71777f9d2578329b6d2bef6
109 lines
3.4 KiB
Swift
109 lines
3.4 KiB
Swift
//
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// PhotoFeedTableViewController.swift
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// Texture
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//
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// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
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// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
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// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
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//
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import UIKit
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class PhotoFeedTableViewController: UITableViewController {
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var activityIndicator: UIActivityIndicatorView!
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var photoFeed = PhotoFeedModel(photoFeedModelType: .photoFeedModelTypePopular)
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init() {
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super.init(nibName: nil, bundle: nil)
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navigationItem.title = "UIKit"
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}
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required init?(coder aDecoder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func viewDidLoad() {
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super.viewDidLoad()
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navigationController?.hidesBarsOnSwipe = true
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setupActivityIndicator()
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configureTableView()
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fetchNewBatch()
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}
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func fetchNewBatch() {
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activityIndicator.startAnimating()
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photoFeed.updateNewBatchOfPopularPhotos() { additions, connectionStatus in
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switch connectionStatus {
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case .connected:
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self.activityIndicator.stopAnimating()
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self.addRowsIntoTableView(newPhotoCount: additions)
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case .noConnection:
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self.activityIndicator.stopAnimating()
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break
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}
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}
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}
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// Helper functions
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func setupActivityIndicator() {
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let activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
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activityIndicator.translatesAutoresizingMaskIntoConstraints = false
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self.activityIndicator = activityIndicator
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self.tableView.addSubview(activityIndicator)
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NSLayoutConstraint.activate([
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activityIndicator.centerXAnchor.constraint(equalTo: self.tableView.centerXAnchor),
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activityIndicator.centerYAnchor.constraint(equalTo: self.tableView.centerYAnchor)
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])
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}
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func configureTableView() {
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tableView.register(PhotoTableViewCell.self, forCellReuseIdentifier: "photoCell")
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tableView.allowsSelection = false
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tableView.rowHeight = UITableViewAutomaticDimension
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tableView.separatorStyle = .none
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}
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}
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extension PhotoFeedTableViewController {
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func addRowsIntoTableView(newPhotoCount newPhotos: Int) {
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let indexRange = (photoFeed.numberOfItems - newPhotos..<photoFeed.numberOfItems)
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let indexPaths = indexRange.map { IndexPath(row: $0, section: 0) }
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tableView.insertRows(at: indexPaths, with: .none)
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}
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// TableView Data Source
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override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return photoFeed.numberOfItems
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}
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override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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guard let cell = tableView.dequeueReusableCell(withIdentifier: "photoCell", for: indexPath) as? PhotoTableViewCell else { fatalError("Wrong cell type") }
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cell.photoModel = photoFeed.itemAtIndexPath(indexPath)
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return cell
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}
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override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
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return PhotoTableViewCell.height(
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for: photoFeed.itemAtIndexPath(indexPath),
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withWidth: self.view.frame.size.width
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)
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}
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override func scrollViewDidScroll(_ scrollView: UIScrollView) {
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let currentOffSetY = scrollView.contentOffset.y
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let contentHeight = scrollView.contentSize.height
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let screenHeight = UIScreen.main.bounds.height
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let screenfullsBeforeBottom = (contentHeight - currentOffSetY) / screenHeight
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if screenfullsBeforeBottom < 2.5 {
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self.fetchNewBatch()
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}
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}
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}
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