# Delegate Usage By implementing Mediation delegate protocols you can get notifications about the success, failure, or lifecycle events of the Mediation SDK and its ad objects. ## Mediation Start Delegate Implement the `HeliumSdkDelegate` protocol to receive notifications about the Mediation SDK’s initialization process.

```
extension AppDelegate: 
```

@interface AppDelegate () <HeliumSdkDelegate>

This will allow you to implement the following method:

func heliumDidStartWithError(_ error: ChartboostMediationSDK.ChartboostMediationError?) {
    if let error = error {
        print("Chartboost Mediation did not start due to error: \(error)")
    } else {
        print("Chartboost Mediation Started Successfully")
    }
}

- (void)heliumDidStartWithError:(nullable ChartboostMediationError *)error {
    if (error)
        NSLog(@"Mediation did not start due to error: %@", error);
    else
        NSLog(@"Mediation Started Successfully");
}

## Interstitial Ad Delegates Implement the `CHBHeliumInterstitialAdDelegate` protocol to receive notifications about interstitial ads loading, displaying, and closing.

extension ViewController: CHBHeliumInterstitialAdDelegate

@interface ViewController () <CHBHeliumInterstitialAdDelegate>

This will allow you to implement the following methods:

func heliumInterstitialAd(
    withPlacementName placementName: String,
    requestIdentifier: String,
    winningBidInfo: [String : Any]?,
    didLoadWithError error: ChartboostMediationSDK.ChartboostMediationError?
) {
    if let error = error {
        print("Interstitial with Placement Name:\(placementName) failed to load with error:\(error.localizedDescription)")
    } else {
        print("Interstitial with Placement Name:\(placementName) didLoad")
    }
}

func heliumInterstitialAd(
    withPlacementName placementName: String,
    didShowWithError error: ChartboostMediationSDK.ChartboostMediationError?
) {
    if let error = error {
        print("Interstitial with Placement Name:\(placementName) failed to show with error:\(error.localizedDescription)")
    } else {
        print("Interstitial with Placement Name:\(placementName) didShow")
    }
}

func heliumInterstitialAd(
    withPlacementName placementName: String,
    didCloseWithError error: ChartboostMediationSDK.ChartboostMediationError?
) {
    if let error = error {
        print("Interstitial with Placement Name:\(placementName) failed to close with error:\(error.localizedDescription)")
    } else {
        print("Interstitial with Placement Name:\(placementName) didClose")
    }
}

func heliumInterstitialAdDidRecordImpression(withPlacementName placementName: String) {
    print("Impression recorded")
}

- (void)heliumInterstitialAdWithPlacementName:(NSString * _Nonnull)placementName
                            requestIdentifier:(NSString * _Nonnull)requestIdentifier
                               winningBidInfo:(NSDictionary<NSString *,id> * _Nullable)winningBidInfo
                             didLoadWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Interstitial with Placement Name:%@ failed to load with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Interstitial with Placement Name:%@ didLoad", placementName);
    }
}

- (void)heliumInterstitialAdWithPlacementName:(NSString * _Nonnull)placementName
                             didShowWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Interstitial with Placement Name:%@ failed to show with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Interstitial with Placement Name:%@ didShow", placementName);
    }
}

- (void)heliumInterstitialAdWithPlacementName:(NSString * _Nonnull)placementName
                            didCloseWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Interstitial with Placement Name:%@ failed to close with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Interstitial with Placement Name:%@ didClose", placementName);
    }
}

- (void)heliumInterstitialAdDidRecordImpressionWithPlacementName:(NSString *)placementName
{
    NSLog(@"Impression recorded");
}

## Rewarded Ad Delegates Implement the `CHBHeliumRewardedAdDelegate` protocol to receive notifications about rewarded ads loading, displaying, and closing.

@interface ViewController () <CHBHeliumRewardedAdDelegate>

extension ViewController: CHBHeliumRewardedAdDelegate

This will allow you to implement the following methods:

func heliumRewardedAd(
        withPlacementName placementName: String,
        requestIdentifier: String,
        winningBidInfo: [String : Any]?,
        didLoadWithError error: ChartboostMediationSDK.ChartboostMediationError?
    ) {
        if let error = error {
            print("Rewarded with Placement Name:\(placementName) failed to load with error:\(error.localizedDescription)")
        } else {
            print("Rewarded with Placement Name:\(placementName) didLoad")
        }
    }

    func heliumRewardedAd(
        withPlacementName placementName: String,
        didShowWithError error: ChartboostMediationSDK.ChartboostMediationError?
    ) {
        if let error = error {
            print("Rewarded with Placement Name:\(placementName) failed to show with error:\(error.localizedDescription)")
        } else {
            print("Rewarded with Placement Name:\(placementName) didShow")
        }
    }

    func heliumRewardedAd(
        withPlacementName placementName: String,
        didCloseWithError error: ChartboostMediationSDK.ChartboostMediationError?
    ) {
        if let error = error {
            print("Rewarded with Placement Name:\(placementName) failed to close with error:\(error.localizedDescription)")
        } else {
            print("Rewarded with Placement Name:\(placementName) didClose")
        }
    }

    func heliumRewardedAdDidGetReward(withPlacementName placementName: String) {
        print("Got Reward for RV with placementName:\(placementName)")
    }

    func heliumRewardedAdDidRecordImpression(withPlacementName placementName: String) {
        print("Impression recorded")
    }

- (void)heliumRewardedAdWithPlacementName:(NSString * _Nonnull)placementName
                        requestIdentifier:(NSString * _Nonnull)requestIdentifier
                           winningBidInfo:(NSDictionary<NSString *,id> * _Nullable)winningBidInfo
                         didLoadWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Rewarded with Placement Name:%@ failed to load with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Rewarded with Placement Name:%@ didLoad", placementName);
    }
}

- (void)heliumRewardedAdWithPlacementName:(NSString * _Nonnull)placementName
                         didShowWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Rewarded with Placement Name:%@ failed to show with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Rewarded with Placement Name:%@ didShow", placementName);
    }
}

- (void)heliumRewardedAdWithPlacementName:(NSString * _Nonnull)placementName
                        didCloseWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Rewarded with Placement Name:%@ failed to close with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Rewarded with Placement Name:%@ didClose", placementName);
    }
}

- (void)heliumRewardedAdDidGetRewardWithPlacementName:(NSString * _Nonnull)placementName
{
    NSLog(@"Got Reward for RV with placementName:%@", placementName);
}

- (void)heliumRewardedAdDidRecordImpressionWithPlacementName:(NSString *)placementName
{
    NSLog(@"Impression recorded");
}

## Banner Ad Delegates Implement the `CHBHeliumBannerAdDelegate` protocol to receive notifications about banner ads loading, displaying, and closing.

extension ViewController: HeliumBannerAdDelegate

@interface ViewController () <CHBHeliumBannerAdDelegate>

This will allow you to implement the following methods:

func heliumBannerAd(
        placementName: String,
        requestIdentifier: String,
        winningBidInfo: [String : Any]?,
        didLoadWithError error: ChartboostMediationSDK.ChartboostMediationError?
    ) {
        if let error = error {
            print("Banner with Placement Name:\(placementName) failed to load with error:\(error.localizedDescription)")
        } else {
            print("Banner with Placement Name:\(placementName) didLoad")
        }
    }

    func heliumBannerAd(
        placementName: String,
        didClickWithError error: ChartboostMediationError?
    ) {
        if let error = error {
            print("Banner with Placement Name:\(placementName) didClick with error:\(error.localizedDescription)")
        } else {
            print("Banner with Placement Name:\(placementName) didClick")
        }
    }

    func heliumBannerAdDidRecordImpression(placementName: String) {
        print("Impression recorded")
    }

- (void)heliumBannerAdWithPlacementName:(NSString * _Nonnull)placementName
                      requestIdentifier:(NSString * _Nonnull)requestIdentifier
                         winningBidInfo:(NSDictionary<NSString *,id> * _Nullable)winningBidInfo
                       didLoadWithError:(ChartboostMediationError * _Nullable)error
{
    if (error)
    {
        NSLog(@"Banner with Placement Name:%@ failed to load with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Banner with Placement Name:%@ didLoad", placementName);
    }
}

- (void)heliumBannerAdWithPlacementName:(NSString *)placementName
                      didClickWithError:(ChartboostMediationError *)error
{
    if (error)
    {
        NSLog(@"Banner with Placement Name:%@ didClick with error:%@", placementName, error.description);
    }
    else
    {
        NSLog(@"Banner with Placement Name:%@ didClick", placementName);
    }
}

- (void)heliumBannerAdDidRecordImpressionWithPlacementName:(NSString *)placementName
{
    NSLog(@"Impression recorded");
}

Note: - (void)heliumBannerAdWithPlacementName:(NSString _)placementName didLoadWinningBidWithInfo:(NSDictionary _)bidInfo will only return information for non-refresh banner configurations.