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.

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copywithzone method didnot work with uiwebview

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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.