测评页 导航栏渐白

galaxy/galaxy/Classes/Modules/InteractionH5(与H5交互)/YHH5WebViewVC.swift

@@ -122,6 +122,7 @@ private extension YHH5WebViewVC {
         webview = DWKWebView(frame: .zero)
         webview.scrollView.contentInsetAdjustmentBehavior = .never
         webview.navigationDelegate = self
+        webview.scrollView.delegate = self
         
         let api = YHJsApi()
         api.delegate = self
@@ -306,3 +307,20 @@ extension YHH5WebViewVC {
     }
 }
 
+
+
+//MARK: - UIScrollViewDelegate
+extension YHH5WebViewVC : UIScrollViewDelegate {
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        if scrollView.contentOffset.y > 0 {
+            var alpha =  scrollView.contentOffset.y / (k_Height_NavigationtBarAndStatuBar)
+            if alpha > 1.0 {
+                alpha = 1.0
+            }
+            gk_navBarAlpha = alpha
+            
+        } else {
+            gk_navBarAlpha = 0.0
+        }
+    }
+}