如何在 PDF 中获取选定的单词，以便我可以读出该单词？ [Swift, PDF套件]

Question

我正在 Swift 中为 iOS 创建一个 PDF 查看器。通过该应用程序，我想创建一个功能，让学习者可以点击 PDF 中的每个单词来听到每个单词的发音。

我成功地展示了一个 PDF 文件并朗读了一段文字。但是，我正在努力将它们连接在一起。

如果你能告诉我如何修改以下代码，当用户点击一个词时，该词通过使用文本到语音程序发音，我将不胜感激。

非常感谢！

ViewController.swift

import UIKit
import PDFKit
import AVFoundation

class ViewController: UIViewController {
    @IBOutlet weak var pdfView: PDFView!

    override func viewDidLoad() {
        super.viewDidLoad()
        if let url = Bundle.main.url(forResource: "pdf", withExtension: "pdf"){
            if let pdfDocument = PDFDocument(url:url){
                pdfView.autoScales = true
                pdfView.document = pdfDocument
                } 
    
let wordTouched = "test"
        //playing the word 
                    let utterance = AVSpeechUtterance(string: wordTouched)
                    utterance.voice = AVSpeechSynthesisVoice(language: "en-US")

                    let synth = AVSpeechSynthesizer()
                    synth.speak(utterance)

我知道有几个关于如何 select PDF 中所有文本的讨论 ()。我想得到一个用户点击的单词，并将其发送到 AVSpeechSynthesizer().

Answer 1

将 UITapGestureRecognizer 添加到 pdfView:

let tapgesture = UITapGestureRecognizer(target: self, action: #selector(tapGesture(_:)))
pdfView.addGestureRecognizer(tapgesture)

处理点击手势：

@objc func tapGesture(_ gestureRecognizer: UITapGestureRecognizer) {
    let point = gestureRecognizer.location(in: pdfView)

    if let page = pdfView.page(for: point, nearest: false) {
        //convert point from pdfView coordinate system to page coordinate system
        let convertedPoint = pdfView.convert(point, to: page)

        //ensure that there is no link/url at this point
        if page.annotation(at: convertedPoint) == nil {
            //get word at this point
            if let selection = page.selectionForWord(at: convertedPoint) {
                if let wordTouched = selection.string {
                    //pronounce word
                    let utterance = AVSpeechUtterance(string: wordTouched)
                    utterance.voice = AVSpeechSynthesisVoice(language: "en-US")

                    let synth = AVSpeechSynthesizer()
                    synth.speak(utterance)

                    //if you also want to show selection of this word for one second
                    pdfView.currentSelection = selection
                    DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                        self.pdfView.clearSelection()
                    }
                }
            }
        }
    }
}

如何在 PDF 中获取选定的单词，以便我可以读出该单词？ [Swift, PDF套件]

How can I get a selected word in PDF so that I can have the word pronounced? [Swift, PDFKit]

pdf

pdfkit

ios

avspeechsynthesizer

swift

ViewController.swift