1. 创建webView时使用：作用是允许h5多页面，手势滑动
wkWebView.allowsBackForwardNavigationGestures = true
2. 因为App系统自带侧滑手势返回，所以要这样做：
//监听侧滑手势
let swiperGesture = UISwipeGestureRecognizer(target: self, action: #selector(handleNavigationTransition(_:)))
swiperGesture.delegate = self // 设置手势代理，拦截手势触发
view.addGestureRecognizer(swiperGesture)
navigationController?.interactivePopGestureRecognizer?.isEnabled = true
navigationController?.interactivePopGestureRecognizer?.delegate = self
iOS App用WKWebView加载h5, h5多页面手势返回，h5返回App
原文：https://www.cnblogs.com/liuw-flexi/p/15048684.html