About PDFKit learning project on iOS 11, Like iBooks.app.
书库页面获取PDF相关数据, 可以通过KVC获取。
- PDF书名
if let title = documentAttributes["Title"] as? String {
cell.title = title
}- PDF作者
if let author = documentAttributes["Author"] as? String {
cell.author = author
}- 获取第一页作为封面，封面已经做了缓存
let thumbnailCache = NSCache<NSURL, UIImage>()
private let downloadQueue = DispatchQueue(label: "com.jovins.pdfview.thumbnail")
if let page = document.page(at: 0), let key = document.documentURL as NSURL? {
cell.url = key
if let thumbnail = thumbnailCache.object(forKey: key) {
cell.image = thumbnail
} else {
downloadQueue.async {
let imgWidth: CGFloat = (UIScreen.main.bounds.width - 48)/2 - 24
let imgHeight: CGFloat = 190
let thumbnail = page.thumbnail(of: CGSize(width: imgWidth, height: imgHeight), for: .cropBox)
self.thumbnailCache.setObject(thumbnail, forKey: key)
if cell.url == key {
DispatchQueue.main.async {
cell.image = thumbnail
}
}
}
}
}初始化一个DocumentModel模型存储PDFDocument数据。
struct DocumentModel {
var title: String = ""
var author: String = ""
var coverImage: UIImage?
var url: URL?
}class BookManager {
static let shared = BookManager()
func getDocument(_ pdfDoc: PDFDocument?) -> DocumentModel {
var model = DocumentModel()
if let document = pdfDoc, let documentAttributes = document.documentAttributes {
if let title = documentAttributes["Title"] as? String {
model.title = title
} else {
model.title = "No Title"
}
if let author = documentAttributes["Author"] as? String {
model.author = author
} else {
model.author = "No Author"
}
if document.pageCount > 0, let page = document.page(at: 0) {
let imgWidth: CGFloat = (UIScreen.main.bounds.width - 48)/2 - 24
let imgHeight: CGFloat = 190
let thumbnail = page.thumbnail(of: CGSize(width: imgWidth, height: imgHeight), for: .cropBox)
model.coverImage = thumbnail
}
if let url = document.documentURL {
model.url = url
}
}
return model
}
}
图一是PDF浏览详情页
private lazy var pdfView: PDFView = {
let view = PDFView()
view.backgroundColor = Device.bgColor
view.autoScales = true
view.displayMode = .singlePage
view.displayDirection = .horizontal
view.usePageViewController(true, withViewOptions: [UIPageViewController.OptionsKey.spineLocation: 20])
return view
}()
self.pdfView.document = self.document图二是该PDF的所有页面
/// 该页面的核心代码
if let doc = self.document, let page = doc.page(at: indexPath.item) {
let pageNumber = indexPath.item
cell.pageNumber = pageNumber
let key = NSNumber(value: pageNumber)
if let thumbnail = self.thumbnailCache.object(forKey: key) {
cell.image = thumbnail
} else {
let cellSize = CGSize(width: (UIScreen.main.bounds.width - 16 * 4)/3, height: 140)
downloadQueue.async {
let thumbnail = page.thumbnail(of: cellSize, for: .cropBox)
self.thumbnailCache.setObject(thumbnail, forKey: key)
if cell.pageNumber == pageNumber {
DispatchQueue.main.async {
cell.image = thumbnail
}
}
}
}
}图三是该PDF的目录
/// 该页面核心代码
let outline = self.lines[indexPath.item]
cell.titleString = outline.label
cell.pageString = outline.destination?.page?.label
var indentationLevel = -1
var parent = outline.parent
while let _ = parent {
indentationLevel += 1
parent = parent?.parent
}
cell.indentationLevel = indentationLevel图四是浏览时收藏的页面。
/// 获取收藏页
if let documentURL = self.document?.documentURL?.absoluteString, let bookmarks = UserDefaults.standard.array(forKey: documentURL) as? [Int] {
self.bookmarks = bookmarks
self.collection.reloadData()
}
// 显示收藏
let pageNumber = self.bookmarks[indexPath.item]
if let page = self.document?.page(at: pageNumber) {
cell.pageNumber = pageNumber
let key = NSNumber(value: pageNumber)
if let thumbnail = self.thumbnailCache.object(forKey: key) {
cell.image = thumbnail
} else {
let cellSize = CGSize(width: (UIScreen.main.bounds.width - 16 * 4)/3, height: 140)
downloadQueue.async {
let thumbnail = page.thumbnail(of: cellSize, for: .cropBox)
self.thumbnailCache.setObject(thumbnail, forKey: key)
if cell.pageNumber == pageNumber {
DispatchQueue.main.async {
cell.image = thumbnail
}
}
}
}
}打印，直接调取系统方法。
let printInteractionController = UIPrintInteractionController.shared
printInteractionController.printingItem = self.document?.dataRepresentation()
printInteractionController.present(animated: true, completionHandler: nil)
在浏览页存储历史记录
private func storgeHistoryList() {
if let documentURL = self.document?.documentURL?.absoluteString {
let cache = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0].absoluteString
let key = cache.appending("com.jovins.ibook.storgeHistory")
if var documentURLs = UserDefaults.standard.array(forKey: key) as? [String] {
if !documentURLs.contains(documentURL) {
// 不存在则存储
documentURLs.append(documentURL)
UserDefaults.standard.set(documentURLs, forKey: key)
}
} else {
// 第一次存储
UserDefaults.standard.set([documentURL], forKey: key)
}
}
}获取已浏览的记录
fileprivate func refreshData() {
let cache = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)[0].absoluteString
let key = cache.appending("com.jovins.ibook.storgeHistory")
if let documentURLs = UserDefaults.standard.array(forKey: key) as? [String] {
var urls: [URL] = []
for str in documentURLs {
if let url = URL(string: str) {
urls.append(url)
}
}
self.documents = urls.compactMap { PDFDocument(url: $0) }
self.tableView.reloadData()
}
}通过PDFDocument设置代理，然后调用beginFindString可以实现搜索功能。
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
let searchText = searchBar.text!.trimmingCharacters(in: CharacterSet.whitespaces)
if searchText.count < 3 {
return
}
self.searchResults.removeAll()
self.tableView.reloadData()
if let document = self.document {
document.cancelFindString()
document.delegate = self
document.beginFindString(searchText, withOptions: .caseInsensitive)
}
}
/// 代理实现的方法，可以获取到搜索结果
func didMatchString(_ instance: PDFSelection) {
self.searchResults.append(instance)
self.tableView.reloadData()
}该项目未来会增加txt、epub浏览功能。
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