原文网址：https://stackoverflow.com/questions/54515175/undefined-symbols-for-architecture-arm64-jsclasscreate
Undefined symbols for architecture arm64:
"_JSClassCreate", referenced from:
void std::__1::__call_once_proxy<std::__1::tuple<facebook::jsc::JSCRuntime::createObject(std::__1::shared_ptr<facebook::jsi::HostObject>)::$_0&&> >(void*) in libReact.a(JSCRuntime.o)
void std::__1::__call_once_proxy<std::__1::tuple<facebook::jsc::JSCRuntime::createFunctionFromHostFunction(facebook::jsi::PropNameID const&, unsigned int, std::__1::function<facebook::jsi::Value (facebook::jsi::Runtime&, facebook::jsi::Value const&, facebook::jsi::Value const*, unsigned long)>)::$_1&&> >(void*) in libReact.a(JSCRuntime.o)
"_JSContextGetGlobalObject", referenced from:
facebook::jsc::JSCRuntime::global() in libReact.a(JSCRuntime.o)
facebook::jsc::JSCRuntime::createFunctionFromHostFunction(facebook::jsi::PropNameID const&, unsigned int, std::__1::function<facebook::jsi::Value (facebook::jsi::Runtime&, facebook::jsi::Value const&, facebook::jsi::Value const*, unsigned long)>)::HostFunctionMetadata::initialize(OpaqueJSContext const*, OpaqueJSValue*) in libReact.a(JSCRuntime.o)
"_JSEvaluateScript", referenced from:
facebook::jsc::JSCRuntime::evaluateJavaScript(std::__1::unique_ptr<facebook::jsi::Buffer const, std::__1::default_delete<facebook::jsi::Buffer const> >, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> > const&) in libReact.a(JSCRuntime.o)
"_JSGlobalContextCreateInGroup", referenced from:
facebook::jsc::JSCRuntime::JSCRuntime() in libReact.a(JSCRuntime.o)
facebook::jsc::JSCRuntime::JSCRuntime() in libReact.a(JSCRuntime.o)
"_JSGlobalContextRelease", referenced from:
facebook::jsc::JSCRuntime::JSCRuntime() in libReact.a(JSCRuntime.o)
facebook::jsc::JSCRuntime::~JSCRuntime() in libReact.a(JSCRuntime.o)
facebook::jsc::JSCRuntime::JSCRuntime() in libReact.a(JSCRuntime.o)
"_JSGlobalContextRetain", referenced from:
facebook::jsc::JSCRuntime::JSCRuntime(OpaqueJSContext*) in libReact.a(JSCRuntime.o)
解决方法：
Make sure JavaScriptCore.framework is added to Link Binary With Libraries