如何在底部放置AdMob横幅？

Question

How can I place the banner form AdMob on the bottom of the screen? I'm using AdMob as a Relay for when the iAd banner fails to load, but the AdMob banner appears at the top of the screen. I've looked up many ways to do it but non of them work.

here is my code: .h

@interface Class_ScoreViewController : UIViewController <UITextFieldDelegate,ADBannerViewDelegate>
{
    GADBannerView *bannerViewAdMob_;
    ADBannerView *adView;
}
@property (nonatomic,retain) IBOutlet ADBannerView *adView;

.m

@synthesize adView;
- (void)bannerViewDidLoadAd:(ADBannerView *)banner{
    NSLog(@"-----------Displaying Ad-------------");
    [adView setHidden:NO];
    bannerViewAdMob_.hidden = YES;
}

-(void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error{
    NSLog(@"------------Ad Error-------------");
    [adView setHidden:YES];
    CGSize screenSize = [[UIScreen mainScreen] bounds].size;


    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        if (screenSize.height > 480.0f) {
            //iPhone 5
            bannerViewAdMob_ = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height- 89 -GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)];

        }
        else{
            //iPhone 4
            bannerViewAdMob_ = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height-GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)];


        }
    // Create a view of the standard size at the top of the screen.
    // Available AdSize constants are explained in GADAdSize.h.
    bannerViewAdMob_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner];

    // Specify the ad's "unit identifier". This is your AdMob Publisher ID.
    bannerViewAdMob_.adUnitID = @"xxxxxxxxxxxxxxx";

    // Let the runtime know which UIViewController to restore after taking
    // the user wherever the ad goes and add it to the view hierarchy.
    bannerViewAdMob_.rootViewController = self;
    [self.view addSubview:bannerViewAdMob_];

    // Initiate a generic request to load it with an ad.
    [bannerViewAdMob_ loadRequest:[GADRequest request]];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    adView.delegate = self;
    [adView setHidden:YES];
}

Answer 1

you're overriding your variable, check the

 if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        if (screenSize.height > 480.0f)
            bannerViewAdMob_ = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height- 89 -GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)];
        else
            bannerViewAdMob_ = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0, self.view.frame.size.height-GAD_SIZE_320x50.height, GAD_SIZE_320x50.width, GAD_SIZE_320x50.height)];

    bannerViewAdMob_ = [[GADBannerView alloc] initWithAdSize:kGADAdSizeBanner]; // here is you overwrite

to place it properly - set frame/bounds properties after you call initWithAdSize