iOS Undefined symbols for archit

Undefined symbols for architecture arm64:
"OBJC_CLASS_YYCache", referenced from: objc-class-ref in LFNetworking.o "_OBJC_CLASS__AFHTTPRequestSerializer", referenced from:
objc-class-ref in LFNetworking.o
"OBJC_CLASS_AFJSONResponseSerializer", referenced from: objc-class-ref in LFNetworking.o "_OBJC_CLASS__AFHTTPSessionManager", referenced from:
objc-class-ref in LFNetworking.o
ld: symbol(s) not found for architecture arm64

出现这种错误有多种可能：

1.Build Setting->Architectures查看是否包含arm64指令集

arm64.png

2.如果用CocoaPods导入的库，Build Setting->Linking->Other Linker Flags，添加$(inherited)

cocoapods.png

暂时列出这几种，以后遇到了再补充