PDFView没有突出显示搜索结果

Question

我正在试用PDFView，并想突出显示搜索到的单词。我在跟踪这个小教程就在这里 (见搜索段落)。

我正在为我的PDF得到匹配，但是当我设置pdfView.highlightedSelections = searchedItems时，什么都不会发生。

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

好吧，我自己看了这篇文章：https://forums.developer.apple.com/thread/93414

highlightedSelections似乎不像文档所描述的那样工作。我会在苹果公司注册一个窃听器。

PDFSelection本身有一个PDFSelection类型的内部数组。有了这个，我可以在其中添加多个选择。之后，我可以使用pdfView.setCurrentSelection(_:animate:)来设置这个嵌套的选择数组。

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

扩展到Rafal的答案，我让它工作，即使多页文档(和多个搜索词)，就像这样。我还不能测试的是，这是否适用于跨越多个页面的术语：

   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)
            }
         }
      }
   }

Answer 3

唯一适用于我的解决方案是PDFAnnotation和.highlight类型：

let selections = pdfView?.document?.findString("PDFKit, my dear!", withOptions: [.caseInsensitive])
// Simple scenario, assuming your pdf is single-page.
guard let page = selections?.first?.pages.first else { return }

selections?.forEach({ selection 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)
})