WKWebview allowsBackForwardNavigationGestures 和 UINavigationController interactivePopGestureRecognizer 都启用

Question

我嵌入在导航控制器中的视图控制器包含一个 WKWebview，我想在其上启用以下逻辑：

如果 webview 中存在后退项目，做出左屏幕边缘手势应该在 webview 中返回一页（当 allowsBackForwardNavigationGestures 设置为 yes 时 webview 的正常行为）。当没有任何返回项时，它应该在导航控制器（interactivePopGestureRecognizer）中弹出一页。我同时启用了这两个功能并得到了随机结果，有时我在 web 视图中返回一页，有时我在导航堆栈中返回我的主页。我尝试了以下逻辑：

-(void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation {

  if (webView.backForwardList.backItem) {
    MYappDelegate.mainNavigationController.interactivePopGestureRecognizer.enabled = NO;
    self.webView.allowsBackForwardNavigationGestures = YES;
  } else {
    MYappDelegate.mainNavigationController.interactivePopGestureRecognizer.enabled = YES;
    self.webView.allowsBackForwardNavigationGestures = NO;
  }
}

但是当我滑动时它崩溃了，我得到 "WKCompositingView unrecognized selector sent to instance."

有什么地方出错了吗？我猜在哪个手势优先方面存在冲突，但我无法弄清楚在哪里添加此逻辑，以便 webview 和包含其视图控制器的导航控制器都能和平地生活。

Answer 1

我有同样的问题。请尝试以下方式：

首先，向 WebView 添加自定义手势：

    let swipe = UISwipeGestureRecognizer(target: self, action: #selector(goBack))
    swipe.direction = UISwipeGestureRecognizerDirection.right
    swipe.delegate = self.navigationController
    webView.addGestureRecognizer(swipe)

然后，添加一个UIGestureDelegate方法来同时处理手势，

extension UINavigationController: UIGestureRecognizerDelegate{
public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRequireFailureOf otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return gestureRecognizer is UIScreenEdgePanGestureRecognizer
}

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

}

但是有一个小缺陷，就是滑动效果和原生的不一样，在没有触摸的情况下滑动显示新的viewController

Answer 2

也许你可以为 canGoback 使用一个观察者，比如

RACObserve(self.wk_webView, canGoBack)

如果值为真，则执行

if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
    self.navigationController.interactivePopGestureRecognizer.enabled = NO;
}

Answer 3

_webView.allowsBackForwardNavigationGestures = YES;

-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
    self.navigationController.interactivePopGestureRecognizer.enabled = _webView.canGoBack ? NO : YES;
}

WKWebview allowsBackForwardNavigationGestures 和 UINavigationController interactivePopGestureRecognizer 都启用

WKWebview allowsBackForwardNavigationGestures and UINavigationController interactivePopGestureRecognizer both enabled

uinavigationcontroller

ios

wkwebview