React Native

@import Pyze;
#import <UserNotifications/UserNotifications.h>

@import CoreMotion;

//Let AppDelegate inherit UNUserNotificationCenterDelegate
@interface ALAppDelegate () <UNUserNotificationCenterDelegate>
@end

@implementation ALAppDelegate

//Initialize Pyze
- (BOOL)application:(UIApplication *)application willFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 [Pyze initialize:@"PYZE_APP_KEY" withLogThrottling: PyzelogLevelMinimal];
 return YES;
}

//Register for remote notification
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{
 [[UNUserNotificationCenter currentNotificationCenter] requestAuthorizationWithOptions:(UNAuthorizationOptionAlert +UNAuthorizationOptionSound) completionHandler:^(BOOL granted, NSError * _Nullable error) {}];
 [UNUserNotificationCenter currentNotificationCenter].delegate = self;
 [[UNUserNotificationCenter currentNotificationCenter] setNotificationCategories:[PyzeNotification getPyzeDefaultNotificationCategories]];
 [[UIApplication sharedApplication] registerForRemoteNotifications];
 [PyzeNotification initWithLaunchOptions:launchOptions];
 return YES;
}

//Set remote notification token to Pyze
- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
 [Pyze setRemoteNotificationDeviceToken:deviceToken];
}

//Notify Pyze when push received.
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler{
 [Pyze processReceivedRemoteNotification:userInfo withState:[[UIApplication sharedApplication] applicationState] withCompletionHandler:completionHandler];
}

//Let pyze handle the remote notification action
-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)(void))completionHandler{
 [PyzeNotification handlePushNotificationResponseWithUserinfo:response.notification.request.content.userInfo actionIdentifier:response.actionIdentifier];
 completionHandler();
}

//Enable app to view notification in foreground
-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {
 completionHandler(UNNotificationPresentationOptionAlert);
}

@end

#import "NotificationService.h"

@interface NotificationService ()

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

@end

@implementation NotificationService

- (NSURL *) attachmentFileURLWithTempLocation:(NSURL *)location name:(NSString *)fileName {
 NSFileManager *fileManager = [NSFileManager defaultManager];
 NSError *error;
 NSArray * domainDirectories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 NSString *documentsDirectory = [domainDirectories objectAtIndex:0];
 NSString *attachmentLocalFilePath = [documentsDirectory stringByAppendingPathComponent:@"/Pyze/"];
 if(![fileManager fileExistsAtPath:attachmentLocalFilePath]) [fileManager createDirectoryAtPath:attachmentLocalFilePath withIntermediateDirectories:NO attributes:nil error:&error];
 attachmentLocalFilePath =  [attachmentLocalFilePath stringByAppendingFormat:@"/%@",fileName];
 if([fileManager fileExistsAtPath:attachmentLocalFilePath]) {
     [fileManager removeItemAtPath:attachmentLocalFilePath error:&error];
     if (error) NSLog(@"Error in removing file : %@", error.debugDescription);
 }
 [fileManager moveItemAtPath:[location path] toPath:attachmentLocalFilePath error:&error];
 if (error) NSLog(@"Error in moving file to location : %@", error.debugDescription);
 NSURL *mediaFileURL = [NSURL fileURLWithPath:attachmentLocalFilePath];
 return mediaFileURL;
}

- (NSURLSessionDownloadTask *) loadAttachmentsWithURLString:(NSString *)urlString {
 NSURL *mediaURL = [NSURL URLWithString:urlString];
 NSURLSessionDownloadTask *task = [[NSURLSession sharedSession] downloadTaskWithURL:mediaURL completionHandler:^(NSURL * _Nullable location, NSURLResponse * _Nullable response, NSError * _Nullable error) {
       if (!error) {
           NSURL *mediaFileURL = [self attachmentFileURLWithTempLocation:location name:[response suggestedFilename]];
           UNNotificationAttachment *attachment = [UNNotificationAttachment attachmentWithIdentifier:[response suggestedFilename] URL:mediaFileURL options:nil error:&error];
           if (attachment) self.bestAttemptContent.attachments = @[attachment];
           self.contentHandler(self.bestAttemptContent);
       }
   }];
 return task;
}

#pragma mark - UNNotificationServiceExtension delegate

- (void)didReceiveNotificationRequest:(UNNotificationRequest *)request withContentHandler:(void (^)(UNNotificationContent * _Nonnull))contentHandler {
 self.contentHandler = contentHandler;
 self.bestAttemptContent = [request.content mutableCopy];
 self.bestAttemptContent.title = self.bestAttemptContent.title;
 self.bestAttemptContent.subtitle = self.bestAttemptContent.subtitle;
 NSString *mediaUrlString = request.content.userInfo[@"mediaUrl"];
 NSURLSessionDownloadTask *task = [self loadAttachmentsWithURLString:mediaUrlString];
 [task resume];
}

- (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);
}

@end