ios - UIWebView 上的双击识别 - Swift 3
<p><p>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。 </p>
<p>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。</p>
<pre><code>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")
}
}
</code></pre>
<p> <a href="/image/pTouz.png" rel="noreferrer noopener nofollow"><img src="/image/pTouz.png" alt="This picture contains webview in orange"/></a>
<a href="/image/P0MMI.png" rel="noreferrer noopener nofollow"><img src="/image/P0MMI.png" alt="Attribute Inspector for UIWebView"/></a> </p>
<p>代码有什么问题？</p>
<p>我不擅长敏捷。 </p>
<p>提前致谢</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我想你需要添加</p>
<pre><code>webView.delegate = self
</code></pre>
<p>还将 UIWebViewDelegate 添加到您的类(class)中</p>
<p>编辑:</p>
<p>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:</p>
<pre><code>func gestureRecognizer(_: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith:UIGestureRecognizer) -> Bool {
return true
}
func gestureRecognizer(_: UIGestureRecognizer, shouldReceive:UITouch) -> Bool {
return true
}
</code></pre>
<p>编辑 2:</p>
<p>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:</p>
<pre><code>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")
}
</code></pre></p>
<p style="font-size: 20px;">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：
<a href="https://stackoverflow.com/questions/42550365/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/42550365/
</a>
</p>
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