iOS AFNetworking上传图片到服务器

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager POST:url parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData>  formData) {
NSData *imageData = UIImagePNGRepresentation(image);
[formData appendPartWithFileData:imageData name:@"img" fileName:@"23456789.jpg" mimeType:@"image/jpeg"];
<p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; line-height: normal; font-family: Menlo; color: rgb(29, 148, 33);"><span style="white-space:pre">	</span>//@"img" <span style="line-height: normal; font-family: 'Heiti SC Light';">服务器上的</span>img <span style="line-height: normal; font-family: 'Heiti SC Light';">字段</span> <span style="line-height: normal; font-family: 'Heiti SC Light';">容易出错</span></p><p style="margin-top: 0px; margin-bottom: 0px; font-size: 18px; line-height: normal; font-family: Menlo; color: rgb(29, 148, 33);"><span style="font-variant-ligatures: no-common-ligatures; color: #000000">        </span>//@"23456789.jpg" <span style="line-height: normal; font-family: 'Heiti SC Light';">图片名</span> <span style="line-height: normal; font-family: 'Heiti SC Light';">随便填</span></p>
//@"image/jpeg" 图片类型
} success:^(AFHTTPRequestOperation * _Nonnull operation, id  responseObject) {
HeadImage *headImage = [HeadImage objectWithJSONData:responseObject];
success(headImage);
} failure:^(AFHTTPRequestOperation * _Nonnull operation, NSError * error) {
NSLog(@"%@",error);
failure(error);
}];