我正在尝试使用AFNetworking3.0以这种方式下载图像:-(UIImage*)loadImage:(NSString*)link{__blockUIImage*image=[UIImageimageNamed:@"no_user_profile_pic.png"];AFHTTPSessionManager*manager=[AFHTTPSessionManagermanager];manager.responseSerializer=[AFImageResponseSerializerserializer];[managerGET:[linkstringByAddingPerc