fix: prevent memory leak on macOS, closes #536

src/webview/wkwebview/mod.rs

@@ -476,6 +476,9 @@ r#"Object.defineProperty(window, 'ipc', {
         let ns_window = window.ns_window() as id;
         let _: () = msg_send![ns_window, setContentView: webview];
 
+        let interop = NSString::new("interop");
+        let _: () = msg_send![manager, addScriptMessageHandler:webview name:interop];
+
         // make sure the window is always on top when we create a new webview
         let app_class = class!(NSApplication);
         let app: id = msg_send![app_class, sharedApplication];
@@ -650,6 +653,10 @@ impl Drop for InnerWebView {
       // So we need to override the process by navigating to `about:blank`.
       self.navigate("about:blank");
 
+      // To prevent memory leak, we need to remove webview by script message handler.
+      let interop = NSString::new("interop");
+      let _: () = msg_send![self.manager, removeScriptMessageHandlerForName: interop];
+
       let _: Id<_> = Id::from_ptr(self.webview);
       #[cfg(target_os = "macos")]
       let _: Id<_> = Id::from_ptr(self.ns_window);