ios - iAd 跨 View Controller (单例): Somehow not working

Question

我已经为此苦苦挣扎了很长时间。我的错误在哪里？目前隐藏和显示似乎工作，但每次我“回到”我的 View Controller 时，我都会看到我的 View 向上移动，但那里没有广告。但是我第一次看到 View Controller 时，有一个广告。我究竟做错了什么？
我只想跨 View Controller 展示相同的广告，这就像父 UIViewController 类，许多其他 View Controller 继承自:

#pragma mark View lifecycle
-(void)viewDidLoad
{
    [super viewDidLoad];

    if(![[NSUserDefaults standardUserDefaults] objectForKey:kInAppPurchaseNoAds]){
        self.bannerContainer = ((AppDelegate *)[[UIApplication sharedApplication] delegate]).bannerView;
        self.bannerContainer.frame = CGRectOffset(self.bannerContainer.frame, 0, self.view.frame.size.height);
        [self.view addSubview:self.bannerContainer];
    }
}

//Handle the in app purchases
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    //iAd
    if(![[NSUserDefaults standardUserDefaults] objectForKey:kInAppPurchaseNoAds] && !self.bannerContainer){
        self.bannerContainer.delegate = self;
    }

    if(self.bannerContainer.bannerLoaded){
        [self showBanner];
    }

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(checkIAdPurchase) name:IAPHelperProductPurchasedNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];

    [self hideBanner];
    self.bannerContainer.delegate = nil;

    [[NSNotificationCenter defaultCenter] removeObserver:self name:IAPHelperProductPurchasedNotification object:nil];
}

#pragma mark Check iAd purchase
-(void)checkIAdPurchase
{
    if([[NSUserDefaults standardUserDefaults] objectForKey:kInAppPurchaseNoAds] && self.bannerContainer){
        [self hideBanner];
        [self.bannerContainer removeFromSuperview];
        self.bannerContainer.delegate = nil;
        self.bannerContainer = nil;
    }
}

#pragma mark IAd delegate
- (void)bannerViewDidLoadAd:(ADBannerView *)banner
{
    [self showBanner];
}

- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
{
    [self hideBanner];
}


#pragma mark Show and hide the banner
- (void)showBanner
{
    if(!self.isBannerVisible){
        [self.view layoutIfNeeded];
        [UIView animateWithDuration:0.5
                         animations:^{
                             //Restore the constraint
                             self.mainViewBottomConstraint.constant = 50;
                             //Move the banner on
                             self.bannerContainer.frame = CGRectOffset(self.bannerContainer.frame, 0, -50);
                             [self.view layoutIfNeeded];
                         } completion:^(BOOL finished) {
                             self.isBannerVisible = YES;
                         }];
    }
}

- (void)hideBanner
{
    if(self.isBannerVisible){
        [self.view layoutIfNeeded];
        [UIView animateWithDuration:0.5
                         animations:^{
                             //Restore the constraint
                             self.mainViewBottomConstraint.constant = 0;
                             //Move the banner off
                             self.bannerContainer.frame = CGRectOffset(self.bannerContainer.frame, 0, self.bannerContainer.frame.size.height);
                             [self.view layoutIfNeeded];
                         } completion:^(BOOL finished) {
                             self.isBannerVisible = NO;
                         }];
    }
}

Answer 1

实际上，您正在 AppDelegate 中创建 iAd 实例，而这只是整个应用程序中的一个实例。现在，当您第一次来到 Vc 时，由于 viewdidload 中的代码，它会添加到您的 Vc 中。

现在，当您移动到其他 View Controller 时，该 View Controller 还会在 viewdidload 处添加 iAd。您只有一个 iAd 对象，因此它会一次添加到一个 VC 中。因此，当您移动到其他 Vc 时，iAd 将从该 Vc 中删除并添加到新的 VC..

解决方案:您应该在 ViewWillAppear 中调用 iAD subview 代码...