iphone - Check if delegate still exists before calling respondsToSelector -

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i have made uiview sub class deal iads , admob. view controller sub class delegate , works ok. however, view controller disappears before ad has been fetched. resolve set delegate nil in view controller's dealloc implementation.

the problem have respondstoselector: method ran @ same time view controller getting deallocated. causes crash. know how may rearrange this?

the ad view on 10 different view controllers 1 place create ad code.

many thanks

one easy way retaining view until had chance set delegate nil, , release it. can ensure object still alive , prevent crashes.


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