IOS Rich notification didReceiveNotificationRequest is not fired

I'm developing an iPhone application using objective-c. The basic push notification is working properly. Now I want to add rich notification in my app but I cannot get the didReceiveNotificationRequest fired in the NotificationService.

Here is the notification payload I receive on Appdelegate:

https://image.ibb.co/ndA2Qo/grab.png

Here is the NotificationService.m file;

#import "NotificationService.h"
#import "Common.h"

@interface NotificationService ()

@property (nonatomic, strong) void (^contentHandler)(UNNotificationContent *contentToDeliver);
@property (nonatomic, strong) UNMutableNotificationContent *bestAttemptContent;

@end

@implementation NotificationService

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
self.contentHandler = contentHandler;
self.bestAttemptContent = [request.content mutableCopy];
NSLog(@"didReceiveNotificationRequest");
// Modify the notification content here...
// load the attachment
NSDictionary *userInfo = request.content.userInfo;
NSString *imageURL = [userInfo valueForKey:@"thumbnail_image"];
NSArray *parts = [imageURL componentsSeparatedByString:@"."];
NSString *extension = [parts lastObject];
[self loadAttachmentForUrlString:imageURL
                        withExtension:extension
               completionHandler:^(UNNotificationAttachment *attachment) {
                   if (attachment) {
                       self.bestAttemptContent.attachments = [NSArray arrayWithObject:attachment];
                   }
                   //self.bestAttemptContent.title = [NSString stringWithFormat:@"%@ [modified]", self.bestAttemptContent.title];

                   self.contentHandler(self.bestAttemptContent);
               }];



}

- (void)serviceExtensionTimeWillExpire {
// Called just before the extension will be terminated by the system.
// Use this as an opportunity to deliver your "best attempt" at modified content, otherwise the original push payload will be used.
self.contentHandler(self.bestAttemptContent);
}

- (void)loadAttachmentForUrlString:(NSString *)urlString withExtension:(NSString *)extension completionHandler:(void(^)(UNNotificationAttachment *))completionHandler  {

__block UNNotificationAttachment *attachment = nil;
NSURL *attachmentURL = [NSURL URLWithString:urlString];

NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session downloadTaskWithURL:attachmentURL
            completionHandler:^(NSURL *temporaryFileLocation, NSURLResponse *response, NSError *error) {
                if (error != nil) {
                    NSLog(@"%@", error.localizedDescription);
                } else {
                    NSFileManager *fileManager = [NSFileManager defaultManager];
                    NSURL *localURL = [NSURL fileURLWithPath:[temporaryFileLocation.path stringByAppendingString:extension]];
                    [fileManager moveItemAtURL:temporaryFileLocation toURL:localURL error:&error];

                    NSError *attachmentError = nil;
                    attachment = [UNNotificationAttachment attachmentWithIdentifier:@"" URL:localURL options:nil error:&attachmentError];
                    if (attachmentError) {
                        NSLog(@"%@", attachmentError.localizedDescription);
                    }
                }
                completionHandler(attachment);
            }] resume];
}

@end

What am I missing?

Please advice,

Semih

You are downloading the image in background thread which is causing the issue in Rich Push Notification case. If you want you can try with this framework

Also Add "content-available":1 in your aps

OR you can try downloading like this,

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent *))contentHandler {

    self.contentHandler = contentHandler;
    self.bestAttemptContent = [request.content mutableCopy];

    self.bestAttemptContent.title = [NSString stringWithFormat:@"%@",request.content.title];
    self.bestAttemptContent.body = [NSString stringWithFormat:@"%@",request.content.body];

    NSString *attachmentUrlString = [NSString stringWithFormat:@"%@",[request.content.userInfo valueForKey:@"thumbnail_image"]];

    if (![attachmentUrlString isKindOfClass:[NSString class]]) {
        [self failEarly];
        return;
    }

    NSURL *url = [NSURL URLWithString:attachmentUrlString];
    if (!url) {
        [self failEarly];
        return;
    }

    NSData *data = [NSData dataWithContentsOfURL:url];
    if (!data) {
        [self failEarly];
        return;
    }

    NSString *identifierName = [self getIdentifierName:attachmentUrlString];
    NSString *tmpSubFolderName = [[NSProcessInfo processInfo] globallyUniqueString];

    self.bestAttemptContent.attachments = [NSArray arrayWithObject:[self create:identifierName andData:data withOptions:nil andTmpFolderName:tmpSubFolderName]] ;
    self.contentHandler(self.bestAttemptContent);

}

-(void)failEarly {
    self.contentHandler(self.bestAttemptContent);
}

-(NSString *)getIdentifierName:(NSString *)fileURL
{
    NSString *identifierName = @"image.jpg";

    if (fileURL) {
        identifierName = [NSString stringWithFormat:@"file.%@",fileURL.lastPathComponent];
    }

    return identifierName;
}

-(UNNotificationAttachment *)create:(NSString *)identifier andData:(NSData *)data withOptions:(NSDictionary *)options andTmpFolderName:(NSString *)tmpSubFolderName {

    NSString *fileURLPath = NSTemporaryDirectory();
    NSString *tmpSubFolderURL = [fileURLPath stringByAppendingPathComponent:tmpSubFolderName];
    NSError *error;
    [[NSFileManager defaultManager] createDirectoryAtPath:tmpSubFolderURL withIntermediateDirectories:TRUE attributes:nil error:&error];
    if(!error) {
        NSString *fileURL = [tmpSubFolderURL stringByAppendingPathComponent:identifier];
        [data writeToFile:fileURL atomically:YES];
        UNNotificationAttachment *attachment = [UNNotificationAttachment attachmentWithIdentifier:identifier URL:[NSURL fileURLWithPath:fileURL] options:options error:&error];
        return attachment;
    }
    return nil;
}

- (void)serviceExtensionTimeWillExpire {
    self.contentHandler(self.bestAttemptContent);
}