WKWebView local file in iframe

Question

I have a WKWebView that loads a local html file called "start.html". Inside this file, I load another local document in an iframe.

But I am not allowed to use js from start.html for iframe content, and iframe content is not allowed to load js file.

Before WKWebView, I use UIWebView, but I have to migrate to improve performance

In UIWebView, I never had crossdomain security issues.

When I add the sandbox='allow-same-origin' attribute to the iframe, I can successfully execute js code from start.html, like this

 $("#frame")[0].contentWindow.document.getElementsByClassName('password_field')[0].value = password_field 

but the js code and HTTP requests inside the iframe (the file loaded in the iframe is a js player) is not allowed to run, I get the abstract of errors:

 Blocked a frame with origin "null" from accessing a frame with origin "null". Protocols, domains, and ports must match. 

What is the difference between UIWebVIew and WKWebView. Is there a solution to allow js code and http requests inside an iframe?

Answer 1

WKWebView only allowed to read local content stored in a directory provided by NSTemporaryDirectory() .

See my answer here for more details.