Could not create a sandbox extension for/

iOS8 Apple launches Wkwebview.

Under iOS9, loadrequest can not load the local HTML file, if you want to use Wkwebview to fit iOS9 below, you need to judge.

iOS9, the HTML file needs to be copied to the TMP path and then loadrequest.

After iOS9, the Loadfileurl:allowingreadaccesstourl method is provided to load the HTML local file.

Be sure to pay attention!!! Need to be in addition to the HTML file JS files and a variety of resources to be copied to the TMP path!

Could not create a sandbox extension for/