PDFView不会突出显示搜索结果

Question

我正在尝试PDFView，并希望突出显示搜索到的单词。我在这里关注这个小教程（请参阅搜索段落）。

我正在为我的PDF找到匹配项，但是当我设置时pdfView.highlightedSelections = searchedItems什么也没发生。

这是我的代码（VC扩展了PDFDocumentDelegate）

var document: PDFDocument!
var searchedItems: [PDFSelection] = []


override func viewDidLoad() {
    super.viewDidLoad()

    let url = Bundle.main.url(forResource: "test3", withExtension: "pdf")
    document = PDFDocument(url: url!)
    pdfView.document = document
    pdfView.document?.delegate = self
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    pdfView.document?.findString("Product", withOptions: .caseInsensitive)
}

func documentDidEndDocumentFind(_ notification: Notification) {
    pdfView.highlightedSelections = nil
    pdfView.highlightedSelections = searchedItems
}

func documentDidFindMatch(_ notification: Notification) {
    if let selection = notification.userInfo?.first?.value as? PDFSelection {
        selection.color = .yellow
        searchedItems.append(selection)
        print("didFindMatch")
    }
}

Answer 1

好的，我通过在这里阅读以下主题来自己弄清楚：https : //forums.developer.apple.com/thread/93414

似乎highlightedSelections无法按文档所述。我将向Apple提交错误。

PDFSelection本身具有Type的内部数组PDFSelection。有了这个，我可以在其中添加多个选择。之后，我可以pdfView.setCurrentSelection(_:animate:)用来设置此嵌套选择数组。

var document: PDFDocument!
var searchedItem: PDFSelection?

override func viewDidLoad() {
    super.viewDidLoad()

    let url = Bundle.main.url(forResource: "test3", withExtension: "pdf")
    document = PDFDocument(url: url!)
    pdfView.document = document
    pdfView.document?.delegate = self
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
        self.document?.beginFindString("Product", withOptions: .caseInsensitive)        
}

func documentDidEndDocumentFind(_ notification: Notification) {
    pdfView.setCurrentSelection(searchedItem, animate: true)
}

func documentDidFindMatch(_ notification: Notification) {
    if let selection = notification.userInfo?.first?.value as? PDFSelection {
        selection.color = .yellow
        if searchedItem == nil {
            // The first found item sets the object.
            searchedItem = selection
        } else {
            // All other found selection will be nested
            searchedItem!.add(selection)
        }
    }
}

Answer 2

扩展拉法尔的答案，我让它甚至可以处理多个页面文档（和多个搜索词），就像这样。我还无法测试的是这是否适用于跨多个页面的术语：

   private func highlight(searchTerms: [String]?)
   {
      searchTerms?.forEach { term in
         let selections = pdfView?.document?.findString(term, withOptions: [.caseInsensitive])

         selections?.forEach { selection in
            selection.pages.forEach { page in
               let highlight = PDFAnnotation(bounds: selection.bounds(for: page), forType: .highlight, withProperties: nil)
               highlight.endLineStyle = .square
               highlight.color = UIColor.orange.withAlphaComponent(0.5)

               page.addAnnotation(highlight)
            }
         }
      }
   }