PDFView (UIViewer) [Swift, iOS 15, PDFKit] 中无法识别屏幕边缘手势

Question

我正在显示一个 PDF 文件，并想添加一个屏幕边缘手势来移动页面。

当 PDF 的全部内容显示在屏幕上时，以下代码可以正常工作。但是，当 PDF 被缩放时，屏幕边缘手势甚至无法激活。

override func viewDidLoad(){
        super.viewDidLoad()


    //set up gesture to swipe from the edge
    let leftScreenEdgeRecognizer = UIScreenEdgePanGestureRecognizer (
        target: self, action: #selector(TextDocumentViewController.leftEdgePanGestureHandler(_ : )))
    leftScreenEdgeRecognizer.edges = UIRectEdge.left
    
    let rightScreenEdgeRecognizer = UIScreenEdgePanGestureRecognizer (
        target: self, action: #selector(TextDocumentViewController.rightEdgePanGestureHandler(_ : )))
    rightScreenEdgeRecognizer.edges = UIRectEdge.right
    
    //register the gesture
    pdfView.addGestureRecognizer(leftScreenEdgeRecognizer)
    pdfView.addGestureRecognizer(rightScreenEdgeRecognizer)
}



//gesture functions here
@objc func leftEdgePanGestureHandler(_ sender: UIScreenEdgePanGestureRecognizer){     
        if(sender.state == UIGestureRecognizer.State.ended){
        print ("Left Edge")
        pdfView.goToPreviousPage(sender)
    }
    
}

@objc func rightEdgePanGestureHandler(_ sender: UIScreenEdgePanGestureRecognizer){
        if(sender.state == UIGestureRecognizer.State.ended){
        print ("right Edge")
        pdfView.goToNextPage(sender)
    }
}

我厌倦了添加类似的代码，

 func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
            return true
        }

但是，这根本不起作用。

Answer 1

感谢为我的旧问题提供的答案，我能够解决这个问题。我完全忘记了这篇文章。在通过尝试和错误了解了更多关于多个手势检测的信息后，我意识到我可以通过以下方式解决这个发布的问题：

启用多手势激活：

class ViewController: UIViewController, UIGestureRecognizerDelegate,  UIDocumentPickerDelegate, PDFViewDelegate {
// ... other things
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, 
    shouldRecognizeSimultaneouslyWith otherGestureRecognizer: 
    UIGestureRecognizer) -> Bool {
            return true
        }
}

确保正确设置delegate。

override func viewDidLoad(){
        super.viewDidLoad()

        //set gesture
        leftScreenEdgeRecognizer.delegate = self
        rightScreenEdgeRecognizer.delegate = self
}