说明是BocAasPayManager类里需要引用AlipaySDK,而你的工程里还没有导入AlipaySDK,所以导入AlipaySDK就可以了。
Undefined symbols for architecture x86_64:
"_OBJC_CLASS_$_AlipaySDK", referenced from:
objc-class-ref in BocAasPaySDK(BocAasPayManager.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)