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samples/add_to_app/books/ios_books/IosBooks/ViewController.swift

136 lines
4.8 KiB

// Copyright 2020 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import Flutter
import UIKit
class ViewController: UITableViewController, BKHostBookApi {
private var books: [BKBook] = []
private var api: BKFlutterBookApi!
private var editingIndex: Int = -1
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "Books"
let appDelegate = UIApplication.shared.delegate as! AppDelegate
BKHostBookApiSetup(appDelegate.engine.binaryMessenger, self)
api = BKFlutterBookApi.init(binaryMessenger: appDelegate.engine.binaryMessenger)
if let url = URL(
string: "https://www.googleapis.com/books/v1/volumes?q=greenwood+tulsa&maxResults=15")
{
self.loadBooks(url: url) { (newBooks) in
if let newBooks = newBooks {
self.books = newBooks
self.tableView.reloadData()
}
}
}
}
/**
Loads a JSON file from the supplied URL, parses it and calls the callback with the array of
parsed books on the main thread.
*/
func loadBooks(url: URL, completion: @escaping ([BKBook]?) -> Void) {
URLSession.shared.dataTask(with: url) { data, response, error in
if let data = data {
do {
if let json = try JSONSerialization.jsonObject(with: data, options: [])
as? [String: Any]
{
var newBooks: [BKBook] = []
for item in json["items"] as! [[String: Any]] {
let volumeInfo = item["volumeInfo"] as! [String: Any]
let title = volumeInfo["title"] as! String
let subtitle = volumeInfo["subtitle"] as! String?
let authors = (volumeInfo["authors"] as! [String]).joined(separator: " & ")
let pageCount = volumeInfo["pageCount"] as! Int32
let publishedDate = volumeInfo["publishedDate"] as! String
let summary = volumeInfo["description"] as! String?
let imageLinks = volumeInfo["imageLinks"] as! [String: Any]
let thumbnail: BKThumbnail = BKThumbnail.init()
thumbnail.url = imageLinks["thumbnail"] as! String?
let book: BKBook = BKBook.init()
book.author = authors
book.title = title
book.subtitle = subtitle
book.title = title
book.pageCount = NSNumber.init(value: pageCount)
book.publishDate = publishedDate
book.summary = summary
book.thumbnail = thumbnail
newBooks.append(book)
}
DispatchQueue.main.async {
completion(newBooks)
}
}
} catch let error {
print("json decode error: \(error)")
completion(nil)
}
}
}.resume()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.books.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath)
-> UITableViewCell
{
let cell: BookCell = self.tableView.dequeueReusableCell(withIdentifier: "BookCell") as! BookCell
let bookInfo = books[indexPath.row]
cell.title.text = bookInfo.title
cell.subtitle.text = bookInfo.subtitle
if let author = bookInfo.author {
cell.byLine.text = "by: \(author)"
}
weak var weakSelf = self
let editAction = UIAction(title: "Edit") { (action) in
if let weakSelf = weakSelf {
weakSelf.editItem(index: indexPath.row)
}
}
cell.editButton.removeTarget(nil, action: nil, for: .allEvents)
cell.editButton.addAction(editAction, for: UIControl.Event.touchUpInside)
return cell
}
/**
Presents the FlutterViewController that edits the book at the supplied index.
*/
func editItem(index: Int) {
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let flutterViewController = FlutterViewController.init(
engine: appDelegate.engine, nibName: nil, bundle: nil)
self.editingIndex = index
api.displayBookDetailsBook(self.books[index]) { (error) in
if let error = error {
print(error)
}
}
self.present(flutterViewController, animated: true, completion: nil)
}
/**
Called by Pigeon when the FlutterViewController is dismissed without accepting any edits.
*/
func cancelWithError(_ error: AutoreleasingUnsafeMutablePointer<FlutterError?>) {
self.editingIndex = -1
self.dismiss(animated: true, completion: nil)
}
/**
Called by Pigeon when edits to the book are accepted in the FlutterViewController.
*/
func finishEditingBook(_ input: BKBook, error: AutoreleasingUnsafeMutablePointer<FlutterError?>) {
self.books[editingIndex] = input
self.tableView.reloadData()
self.editingIndex = -1
self.dismiss(animated: true, completion: nil)
}
}