Facebook Native Ads FBNativeAdsManagerDelegate implementation methods did not called

Question

FBNativeAdsManagerDelegate in Facebook Native Ads working properly in UIViewController class but when used in custom NSObject class its not working i.e. its delegate methods nativeAdsLoaded and nativeAdsFailedToLoadWithError did not get called.

CustomFBAd.h file

@import FBAudienceNetwork;

#import <Foundation/Foundation.h>

@protocol OnFBNativeAdLoadedDelegate<NSObject>

- (void)onFBNativeAdLoaded:(UIView *)adView;

@end

@interface CustomFBAd : NSObject

@property (nonatomic,weak) id <OnFBNativeAdLoadedDelegate>delegate;

-(void)requestNativeAd:(NSString *)FaceBookPlacementID;
@end

CustomFBAd.m file

#import "CustomFBAd.h"

@interface CustomFBAd ()<FBNativeAdsManagerDelegate,FBNativeAdDelegate>

@property (nonatomic, strong) FBNativeAdsManager *manager;
@property (nonatomic, weak) FBNativeAdScrollView *scrollView;

@end
@implementation CustomFBAd

-(void)requestNativeAd:(NSString *)FaceBookPlacementID{
    if(FaceBookPlacementID.length != 0){
        FBNativeAdsManager *manager = [[FBNativeAdsManager alloc] initWithPlacementID:FaceBookPlacementID forNumAdsRequested:5];
        manager.delegate = self;
        [FBAdSettings addTestDevice:@"cf1bb93becbe6e31f26fdf7d80d19b4ae225afaa"];
        [manager loadAds];
        self.manager = manager;
    }
}

#pragma mark - FBNativeAdDelegate implementation

- (void)nativeAdDidClick:(FBNativeAd *)nativeAd
{
    //    NSLog(@"Native ad was clicked.");
}

- (void)nativeAdDidFinishHandlingClick:(FBNativeAd *)nativeAd
{
    //    NSLog(@"Native ad did finish click handling.");
}

- (void)nativeAdWillLogImpression:(FBNativeAd *)nativeAd
{
    //    NSLog(@"Native ad impression is being captured.");
}

#pragma mark FBNativeAdsManagerDelegate

-(void)nativeAdDidLoad:(FBNativeAd *)nativeAd
{

}

- (void)nativeAdsLoaded
{
    NSLog(@"Native ads loaded, constructing native UI...");

    if (self.scrollView) {
        [self.scrollView removeFromSuperview];
        self.scrollView = nil;
    }

    FBNativeAdScrollView *scrollView = [[FBNativeAdScrollView alloc] initWithNativeAdsManager:self.manager withType:FBNativeAdViewTypeGenericHeight120];
    scrollView.xInset = 0;
    scrollView.delegate = self;
    self.scrollView = scrollView;

    [self.delegate onFBNativeAdLoaded:self.scrollView];
}

- (void)nativeAdsFailedToLoadWithError:(NSError *)error
{
    NSLog(@"Native ads failed to load with error: %@", error);
}

@end

As stated in above code I did set FBNativeAdsManager's delegate in requestNativeAd method as

manager.delegate = self;

And also used as FBNativeAdsManagerDelegate,FBNativeAdDelegate

@interface CustomFBAd ()<FBNativeAdsManagerDelegate,FBNativeAdDelegate>

And call this code as

    CustomFBAd *objFBAd = [[CustomFBAd alloc]init];
    objFBAd.delegate = self;
    [objFBAd requestNativeAd:@"my_FB_placement_Id"];

any clue (Note : same code works if I use it in UIViewController)? Thanks

Answer 1

Finally it works after making strong reference of CustomFBAd it works like a charm(Thanks to @MuhammadZohaibEhsan).So init CustomFBAd as

@property(nonatomic, strong) CustomFBAd * objFBAd;

And change

    CustomFBAd *objFBAd = [[CustomFBAd alloc]init];
    objFBAd.delegate = self;
    [objFBAd requestNativeAd:@"my_FB_placement_Id"];

to

    self.objFBAd = [[CustomFBAd alloc]init];
    self.objFBAd.delegate = self;
    [self.objFBAd requestNativeAd:@"my_FB_placement_Id"];