为PDFView添加手势识别器

Question

我正在尝试使用PDFKit为PDFView添加手势识别器。我使用以下代码：

class ViewController: UIViewController, PDFDocumentDelegate {


@IBOutlet weak var pdfView: PDFView?

/// - Tag: SetDelegate
override func viewDidLoad() {
    super.viewDidLoad()

    if let documentURL = Bundle.main.url(forResource: "test", withExtension: "pdf") {
        if let document = PDFDocument(url: documentURL) {

            // Center document on gray background
            pdfView?.autoScales = true
            pdfView?.backgroundColor = UIColor.lightGray
            // 1. Set delegate
            document.delegate = self
            pdfView?.document = document
        }
    }
   func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: pdfView)
            print(currentPoint)
        }
    }

    func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: pdfView)
            print(currentPoint)
        }
    }

    func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let currentPoint = touch.location(in: pdfView)
            print(currentPoint)
        }
    }


}

// 2. Return your custom PDFPage class
/// - Tag: ClassForPage
func classForPage() -> AnyClass {
    return WatermarkPage.self
  }

}

PDFView上附有一个文档（PDFDocument（）反过来打开PDFPage。当代码编译时，无法识别触摸。识别PDF页面触摸的最佳方法是什么？

Answer 1

您可以使用以下内容：

let panAnnotationGesture = UIPanGestureRecognizer(target: self, action: #selector(didPanAnnotation(sender:)))
pdfView.addGestureRecognizer(panAnnotationGesture)

和

@objc func didPanAnnotation(sender: UIPanGestureRecognizer) {
        let touchLocation = sender.location(in: pdfView)
    ...
}