ios - 检测用户何时向左或向右滑动以在 WKWebView 上前后移动
<p><p>我正在使用 WKWebView，我允许前后导航手势:</p>
<pre><code>myWkWebView.allowsBackForwardNavigationGestures = true
</code></pre>
<p>现在，用户有两种返回方式:按下按钮或向左滑动。行为会有所不同，所以我想知道如何知道用户何时向左/向右滑动，以便我可以处理这个问题。</p>
<p>我查看了 WKNavigationDelegate 引用 (<a href="https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKNavigationDelegate_Ref/" rel="noreferrer noopener nofollow">https://developer.apple.com/library/ios/documentation/WebKit/Reference/WKNavigationDelegate_Ref/</a>)，但找不到任何有用的东西。</p>
<p>有什么想法吗？</p>
<p><strong>编辑</strong></p>
<p>我忘了说我也尝试过添加滑动手势识别器，这样:</p>
<pre><code> let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(MyVC.respondToSwipeLeftOrRight(_:)))
swipeRight.direction = UISwipeGestureRecognizerDirection.Right
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(MyVC.respondToSwipeLeftOrRight(_:)))
swipeLeft.direction = UISwipeGestureRecognizerDirection.Left
self.view.addGestureRecognizer(swipeRight)
self.view.addGestureRecognizer(swipeLeft)
myWkWebView.scrollView.panGestureRecognizer.requireGestureRecognizerToFail(swipeRight)
myWkWebView.scrollView.panGestureRecognizer.requireGestureRecognizerToFail(swipeLeft)
</code></pre>
<p>但是每次我向左或向右滑动时它们都不会触发。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><pre><code>private var currentBackForwardItem: WKBackForwardListItem?
private func handleBackForwardWebView(navigationAction: WKNavigationAction) {
if navigationAction.navigationType == .BackForward {
let isBack = webView.backForwardList.backList
.filter { $0 == currentBackForwardItem }
.count == 0
if isBack {
} else {
}
}
currentBackForwardItem = webView.backForwardList.currentItem
}
func webView(webView: WKWebView, decidePolicyForNavigationAction navigationAction: WKNavigationAction, decisionHandler: (WKNavigationActionPolicy) -> Void) {
handleBackForwardWebView(navigationAction)
decisionHandler(.Allow)
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 检测用户何时向左或向右滑动以在 WKWebView 上前后移动，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/37251895/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/37251895/
</a>
</p>
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