Xcode Admob单例-“使用未声明的标识符“ shared””错误

Question

Okay first post ever on any forum but i'll do my best to describe my problem. I'm a beginner at Xcode so i'm sorta expecting an easy solution, but i just can't seem to figure this one out.

In Xcode i am trying to create an Admob singleton to get admob in all my view controllers. Admob will back up iAd, which will be showed should Ad fail.

I followed this guide: http://googleadsdeveloper.blogspot.dk/2012/04/creating-gadbannerview-singleton-in.html

I created a GADMasterViewController .m and .h file

The GADMasterViewController.h looks like this

#import "GADBannerView.h"

@interface GADMasterViewController : UIViewController <GADBannerViewDelegate> {
    GADBannerView *adbanner_;
    BOOL isLoaded_;
    id currentDelegate_;
}



@end

and the GADMasterViewController.m file looks exactly as the one in the guide except i put #import "GADMasterViewController.h" at the top.

Then in my viewController.m where i want the ad to show i put

- (void)bannerView:(GADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error{
    _UIiAd.hidden = YES;

    shared = [GADMasterViewController singleton];
    [shared resetAdview:self]
}

However in viewController.mi get the following errors: https://dl.dropboxusercontent.com/u/63928888/Sk%C3%A6rmbillede%202014-09-15%20kl.%2000.17.02.png

Basically it doesn't recognize the returned "shared" err singleton (or whatever "shared" is) from GADMasterViewController.m

How do i "get" "shared" so my viewController doesn't produce these errors?

Answer 1

You are using shared , but you haven't defined it as a variable (local or otherwise).

So, change

shared = [GADMasterViewController singleton];
[shared resetAdview:self]

to either

GADMasterViewController  *shared = [GADMasterViewController singleton];
[shared resetAdview:self];

or

[[GADMasterViewController singleton] resetAdview:self];

so that you are defining the variable, or so that you don't need a variable.