Undefined symbols for architecture arm64:
"OBJC_CLASS_AFHTTPRequestSerializer", 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