because there is a iframe in webview, and lead pageshow only fire once

[Serlight]

Hi @marcuswestin

In advance Thanks for this great SDK.

Now when i import webviewjavascriptbridge in wkwebview, pageshow only fire first go back,

U can get the web code from PR,

do as below,

1. I start a web server python -m SimpleHTTPServer 8000

and then when to next webview, first will show pageshow alert, but next not.

I test it when web contain a iframe the pageshow will be fire first goback()

how can deal this scene，（iframe is needed）

Thanks for improving WebViewJavascriptBridge!

Cheers,
@marcuswestin