Run a method when AFMultipartFormData is finished uploading

Question

I'm sending multiple images to server using

AFMultipartFormData

using a for loop to fetch one image at a time:

NSString *string = [NSString stringWithFormat:@"%@/API/Upload",BaseURLString];

    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

    [manager setRequestSerializer:[AFHTTPRequestSerializer serializer]];

    [manager setResponseSerializer:[AFHTTPResponseSerializer serializer]];

    NSError *error;

    NSString *mystring = @"noName";

//FOR Loop Start

    for(NSData *eachImage in dataStringArray) {



        NSURLRequest *request = [manager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:string parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {



            [formData appendPartWithFormData:eachImage name:@"myImage"];

            [formData appendPartWithFormData:[mystring dataUsingEncoding:NSUTF8StringEncoding]

                                        name:@"FileName"];

        } error:&error];



        NSURLSessionDataTask *task = [manager dataTaskWithRequest:request uploadProgress:nil downloadProgress:nil completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {

            if (error) {

                NSLog(@"%@", error.localizedDescription);

                return;

            }



            [uploadedImageIDs addObject:[[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]];



        }];

        [task resume];

    }//for end

        [self makeJSON:uploadedImageIDs];

But somehow it calls

makeJSON

method before. As there are multiple images so I need it to call after the uploading is finished for all images.

Answer 1

Network processing will run by asynchronous so you need to count in network completionHanlder for knowing when all task finished. Like this

NSString *string = [NSString stringWithFormat:@"%@/API/Upload",BaseURLString];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    [manager setRequestSerializer:[AFHTTPRequestSerializer serializer]];
    [manager setResponseSerializer:[AFHTTPResponseSerializer serializer]];
    NSError *error;
    NSString *mystring = @"noName";
    NSInteger count = 0;

//FOR Loop Start
    for(NSData *eachImage in dataStringArray) {

        NSURLRequest *request = [manager.requestSerializer multipartFormRequestWithMethod:@"POST" URLString:string parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {

            [formData appendPartWithFormData:eachImage name:@"myImage"];
            [formData appendPartWithFormData:[mystring dataUsingEncoding:NSUTF8StringEncoding]
                                        name:@"FileName"];
        } error:&error];

        NSURLSessionDataTask *task = [manager dataTaskWithRequest:request uploadProgress:nil downloadProgress:nil completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
            if (error) {
                NSLog(@"%@", error.localizedDescription);
                return;
            }
            count++
            [uploadedImageIDs addObject:[[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding]];
            if (count == dataStringArray.count) {
              [self makeJSON:uploadedImageIDs];

            }
        }];
        [task resume];
    }//for end

Run a method when AFMultipartFormData is finished uploading

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