ios - UIWebView 上的双击识别 - Swift 3

我正在尝试通过 UIWebView 实现手势识别器来检测双击。但是没有认可。

我在网上查看了一些教程，我可以编译成这个。代码如下。但是没有成功。

class PageContentViewController: UIViewController, UIGestureRecognizerDelegate, UIWebViewDelegate  {

@IBOutlet weak var webView: UIWebView!

var pageIndex: Int = 0
var strTitle: String!
var flag : Int = 0

override func viewDidLoad() {
    super.viewDidLoad()
    webView.delegate = self

    DispatchQueue.main.async {
    let req = URLRequest(url: URL(fileURLWithPath: Bundle.main.path(forResource: self.strTitle+"/index" , ofType: "html")!))
    self.webView.loadRequest(req)
    self.view.addSubview(self.webView)

    }

    let tapGestureRecognizer = UITapGestureRecognizer(target:self, action:#selector(self.goToback))
    tapGestureRecognizer.delegate? = self
    tapGestureRecognizer.numberOfTapsRequired = 2
    webView.isUserInteractionEnabled = true
    webView.addGestureRecognizer(tapGestureRecognizer)
    webView.scrollView.addGestureRecognizer(tapGestureRecognizer)
    webView.gestureRecognizerShouldBegin(tapGestureRecognizer)
}


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


func goToback(){
    print("On the Back")
}

}

代码有什么问题？

我不擅长敏捷。

提前致谢

---

Best Answer-推荐答案

我想你需要添加

webView.delegate = self

还将 UIWebViewDelegate 添加到您的类(class)中

编辑:

您的 shouldRecognizeSimultaneouslyWith 和 shouldReceive 看起来有点奇怪，可能是复制粘贴错误？它应该看起来像:

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

编辑 2:

我复制了你的确切代码并删除了gestureRecognizerShould begin并且它工作，我也能够删除一些其他代码，不确定你的项目中是否需要它，但这是对我有用的:

class ViewController: UIViewController, UIGestureRecognizerDelegate, UIWebViewDelegate  {

@IBOutlet weak var webView: UIWebView!

override func viewDidLoad() {
    super.viewDidLoad()
    webView.delegate = self

    DispatchQueue.main.async {
        let req = URLRequest(url: URL(fileURLWithPath: Bundle.main.path(forResource: self.strTitle+"/index" , ofType: "html")!))
        self.webView.loadRequest(req)
    }

    let tapGestureRecognizer = UITapGestureRecognizer(target:self, action:#selector(self.goToback))
    tapGestureRecognizer.delegate = self
    tapGestureRecognizer.numberOfTapsRequired = 2
    webView.isUserInteractionEnabled = true
    webView.addGestureRecognizer(tapGestureRecognizer)
}


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


func goToback() {
    print("On the Back")
}

关于ios - UIWebView 上的双击识别 - Swift 3，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42550365/