使用AFNetWorking3.0进行图片上传，把image图片转为data 数据。

    NSString *postUrl = @"url";//URL
    NSData *imageData = UIImageJPEGRepresentation(image, 0.1);//image为要上传的图片(UIImage)
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    [manager POST:postUrl parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
        //
        NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
        formatter.dateFormat = @"yyyyMMddHHmmss";
        NSString *fileName = [NSString stringWithFormat:@"%@.png",[formatter stringFromDate:[NSDate date]]];
        //二进制文件，接口key值，文件路径，图片格式
        [formData appendPartWithFileData:imageData name:@"file" fileName:fileName mimeType:@"image/jpg/png/jpeg"];
    } progress:^(NSProgress * _Nonnull uploadProgress) {
        
    } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
        //
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
        //
    }];