Which SDK are you using? Assuming 6.11.1 (the latter), as a rule, you should implement your class as a delegate for GADBannerViewDelegate or GADInterstitialDelegate (refer to Google Docs ):
YourClass.h:
@interface YourClass : SuperClass <GADBannerViewDelegate, GADInterstitialDelegate> {
}
YourClass.m:
- (void)adViewWillPresentScreen:(GADBannerView *)adView {
<your code here>
}
- (void)adViewWillLeaveApplication:(GADBannerView *)adView {
<your code here>
}
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