Copy webview instance to other uiwebview instance

I have a webview and I need to copy to a uiwebview variable or instance. But it's crashing at that point.

The crash is:

[uiwebview copywithZone开发者_开发技巧:] unrecognized selector sent.

copywithzone method didnot work with uiwebview

Once check that, have you used any method named copyWithZone. because of that only, it is giving error. why because, the UIWebView doesn't support that method.