Amazon S3 Integration iOS

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
{
    
    NSString *S3AccessKey = @"";
    NSString *S3SecretKey = @"";
    
    // Initialize based on static credential provider
    AWSStaticCredentialsProvider *credentialsProvider = [[AWSStaticCredentialsProvider alloc] initWithAccessKey:S3AccessKey secretKey:S3SecretKey];
    AWSServiceConfiguration *configuration = [[AWSServiceConfiguration alloc] initWithRegion:AWSRegionUSWest2 credentialsProvider:credentialsProvider];
    AWSServiceManager.defaultServiceManager.defaultServiceConfiguration = configuration;
    return YES;
}

UploadImageView.m

/*
 * Method to upload the file
 * @localPath - image path
 * @fileName - Name of the file
 */

-(void) uploadFile : (NSString*) localPath withFileName:(NSString*) fileName{
  
  AWSS3TransferManagerUploadRequest *uploadRequest = [AWSS3TransferManagerUploadRequest new];
        uploadRequest.contentType = @"image/png";
        uploadRequest.body = [NSURL fileURLWithPath:localPath];
        uploadRequest.key = fileName;
        uploadRequest.bucket = @"your-bucket name";
        
        [uploadRequest setUploadProgress:^(int64_t bytesSent, int64_t totalBytesSent, int64_t totalBytesExpectedToSend){
            
            CGFloat progressDone = ((CGFloat)totalBytesSent)/((CGFloat)totalBytesExpectedToSend);
            dispatch_async(dispatch_get_main_queue(),
                           ^{
                               NSLog(@"Progress %f",progressDone);
                           });
        }];
        AWSS3TransferManager *transferManager = [AWSS3TransferManager defaultS3TransferManager];
        [indicator startAnimating];
        [[transferManager upload:uploadRequest] continueWithBlock:^id(AWSTask *task)
         {
             if (task.result)
             {
                 __block NSString *url = [NSString stringWithFormat:@"%@",uploadRequest.key];
                 NSLog(@"%@",url);
                 [self presignedUrl : fileName];
                 [indicator stopAnimating];
                 dispatch_async(dispatch_get_main_queue(), ^{
                 });
             } else  if (task.error) {
                 [indicator stopAnimating];
                 if ([task.error.domain isEqualToString:AWSS3TransferManagerErrorDomain])
                 {
                     switch (task.error.code)
                     {
                         case AWSS3TransferManagerErrorCancelled:
                         case AWSS3TransferManagerErrorPaused:break;
                         default:NSLog(@"Upload failed: [%@]", task.error);break;
                     }
                 }
                 else
                 {
                     NSLog(@"Upload failed: [%@]", task.error);
                 }
             }
             return nil;
         }];

}

/*
 * Method to generate presigned url to store the image path
 * in DB or download the file
 */
-(void) presignedUrl :(NSString*) image {
    AWSS3GetPreSignedURLRequest *getPreSignedURLRequest = [AWSS3GetPreSignedURLRequest new];
    getPreSignedURLRequest.bucket = @"your-bucket";
    getPreSignedURLRequest.key = image;
    getPreSignedURLRequest.HTTPMethod = AWSHTTPMethodGET;
    getPreSignedURLRequest.expires = [NSDate dateWithTimeIntervalSinceNow:3600]; //please change validity as per your 
    
    [[[AWSS3PreSignedURLBuilder defaultS3PreSignedURLBuilder] getPreSignedURL:getPreSignedURLRequest]
     continueWithBlock:^id(AWSTask *task) {
         
         if (task.error) {
             NSLog(@"Error: %@",task.error);
         } else {
             
             NSURL *presignedURL = task.result;
             NSLog(@"download presignedURL is: \n%@", presignedURL);
         }
         return nil;
     }];

}