iOS AFNetworking 图片上传

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    
    __weak  typeof(self) weakSelf = self;
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        
        UIImage *newImage = [info[UIImagePickerControllerEditedImage] scaleToFitSizeIfNeed:CGSizeMake(1280.0f, 1280.0f)];
        NSData *data = UIImageJPEGRepresentation(newImage, 0.5f);
        NSString *path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"avatar.jpg"];
        [data writeToFile:path atomically:YES];  
        NSString *URL = [NSString stringWithFormat:@"%@%@",URL_HEAD,@"file/upload"];

        AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
        manager.responseSerializer = [AFHTTPResponseSerializer serializer];//设置服务器允许的请求格式内容
        [manager POST:URL parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>  _Nonnull formData) {
            [formData appendPartWithFileData:data name:@"file" fileName:@"avatar.jpg" mimeType:@"image/jpg"];

        } progress:^(NSProgress * _Nonnull uploadProgress) {
            
        } success:^(NSURLSessionDataTask * _Nonnull task, id  _Nullable responseObject) {
            NSDictionary *JSON = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingAllowFragments error:nil];

            NSMutableDictionary *dic = [NSMutableDictionary dictionary];
            [dic setObject:@"user/changeAvatar" forKey:HSOBJ_URL];
            [dic setObject:JSON[@"file_name"] forKey:@"file_name"];
            dic = [[HSNetUrlProcess createCompDictWithParm:dic] mutableCopy];
            
            [AFNetworkTool HVDataCache:dic NetBlock:^(NSDictionary *json) {
                
                FLLoginDataModel * currentUser = [FLLoginDataModel mj_objectWithKeyValues:json];
                currentUser.isLogin = YES;
                [currentUser saveCurrentUser];
                [SVProgressHUD showSuccessWithStatus:@"头像修改成功"];
                [self.navigationController popViewControllerAnimated:YES];
            } ErrorCode:^(int errorCode) {
                
            } Fail:^{
                
            } Setting:nil];
            
        } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
          
        }];
     
    
    });
    [self dismissViewControllerAnimated:YES completion:nil];
}

更改图片的size（用于限制上传图片大小）
UIImage+PPCategory.h(下面的方法在这里)

- (UIImage *)scaleToFitSizeIfNeed:(CGSize)bounds
{
    CGFloat factor1 = bounds.width/self.size.width;
    CGFloat factor2 = bounds.height/self.size.height;
    CGFloat factor = MIN(factor1, factor2);
    if (factor >= 1) {
        return self;
    }
    //      return [self scaleByFactor:factor];
    CGFloat resultWidth = self.size.width * factor;
    CGFloat resultHeight = self.size.height * factor;
    return [self scaleToSize:CGSizeMake(resultWidth, resultHeight)];
}