How to declare variables? Stuck in x-code

I am stuck with 11 lines of errors in x-code... here is one... webView.userInteractionEnabled=NO; 'webview' undeclared .... here is another one... void (^keyBoardWillHide) (NSNotification *)=^(NSNotification * notif) { unused variable 'keyBoardWillHide'.... i don't know how to declare variables
Get your hands on some good book. and post your code if you want to ask questions
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