当我尝试使用Xcode进行编译时，出现以下错误:Undefinedsymbolsforarchitecturei386:"_CGImageSourceCopyPropertiesAtIndex",referencedfrom:-[SDWebImageDownloaderconnection:didReceiveData:]inSDWebImageDownloader.o"_CGImageSourceCreateImageAtIndex",referencedfrom:-[SDWebImageDownloaderconnection:didReceiveData:]inSDWebImag

当我尝试使用Xcode进行编译时，出现以下错误:Undefinedsymbolsforarchitecturei386:"_CGImageSourceCopyPropertiesAtIndex",referencedfrom:-[SDWebImageDownloaderconnection:didReceiveData:]inSDWebImageDownloader.o"_CGImageSourceCreateImageAtIndex",referencedfrom:-[SDWebImageDownloaderconnection:didReceiveData:]inSDWebImag