【iOS异常】导入SDWebImage时SDWebImageDownloaderOperation.m错误

导入工程后编译，sdwebimagedownloaderoperation.m 和 uiimage+multiformat.m 文件报错如下：

no matching function for call to 'cfnumbergetvalue'

解决办法：

builder setting - compile sources as 改为according to fie type，之前是objectc++