ios - 使用NSURLSession将图像发送到服务器

嗨，我是ios的新手，我正在尝试使用NSURLSession将一些参数发送到服务器(它们是USERNAME，USERTYPE，USERimage)
但根据我下面的代码图像不会发送到服务器，以及如何将图像发送到服务器，请帮助我我在这里哪里做错了？

我的代码:

    NSError *error;

    NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
    NSURL *url = [NSURL URLWithString:@"[JSON SERVER"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];

    [request addValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [request addValue:@"application/json" forHTTPHeaderField:@"Accept"];

    [request setHTTPMethod:@"POST"];

   UIImage *myImage = [UIImage imageNamed:@"myImage.png"];
NSString *myImage = [UIImagePNGRepresentation(myImage) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];

    NSDictionary *mapData = [[NSDictionary alloc] initWithObjectsAndKeys: @"TEST IOS", @"name",
                         @"IOS TYPE", @"typemap",
                         myImage,@"image"
                         nil];
    NSData *postData = [NSJSONSerialization dataWithJSONObject:mapData options:0 error:&error];
    [request setHTTPBody:postData];


    NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

    }];

    [postDataTask resume];

最佳答案

尝试使用

UIImage *myImage = [UIImage imageNamed:@"myImage.png"];
NSString *base64Image = [UIImagePNGRepresentation(myImage) base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];