gistfile1.m

@synthesize share;
....

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
            sourceApplication:(NSString *)sourceApplication
            annotation:(id)annotation {
    // Handle Google+ share dialog URL.
    if ([share handleURL:url
                     sourceApplication:sourceApplication
                     annotation:annotation]) {
        return YES;
    }
    
    return NO;
}