AdMobの実装

GADViewController.m

#import "GADBannerView.h"

// Google AdMob
static NSString *const ADMOB_ID = @"YOUR_ADMOB_ID";
static NSString *const ADMOB_IPAD_ID = @"YOUR_ADMOB_ID";

@interface GADViewController () <GADBannerViewDelegate>

@property (weak, nonatomic) IBOutlet GADBannerView *adBannerView;

@end

@implementation GADViewController

#pragma mark - Admob

- (void)initAdmob
{
    // AdMobの初期化
    if (self.adBannerView == nil){
        GADBannerView *adBannerView = nil;
        if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
            // iPad
            adBannerView = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0,
                                                                           self.view.frame.size.height - GAD_SIZE_728x90.height,
                                                                           GAD_SIZE_728x90.width,
                                                                           GAD_SIZE_728x90.height)];
            adBannerView.adUnitID = ADMOB_IPAD_ID;
        } else {
            // iPhoneなど
            adBannerView = [[GADBannerView alloc] initWithFrame:CGRectMake(0.0,
                                                                           self.view.frame.size.height - GAD_SIZE_320x50.height,
                                                                           GAD_SIZE_320x50.width,
                                                                           GAD_SIZE_320x50.height)];
            adBannerView.adUnitID = ADMOB_ID;
        }
        adBannerView.rootViewController = self;
        adBannerView.delegate = self;
        adBannerView.hidden = YES;
        [self.view addSubview:adBannerView];
        self.adBannerView = adBannerView;
    }
    
    GADRequest *request = [GADRequest request];
    [self.adBannerView loadRequest:request];
}

- (void)adViewDidReceiveAd:(GADBannerView *)adBannerView
{
    // AdMob表示
    adBannerView.hidden = NO;
    adBannerView.frame = CGRectMake(self.view.frame.size.width / 2 - adBannerView.frame.size.width / 2,
                            self.view.frame.size.height - adBannerView.frame.size.height,
                            adBannerView.frame.size.width,
                            adBannerView.frame.size.height);
}

- (void)adView:(GADBannerView *)adBannerView didFailToReceiveAdWithError:(GADRequestError *)error
{
    // AdMobを削除
    [adBannerView removeFromSuperview];
}

@end