for anyone having the same issues:
@iktomi Thanks the clang setting for the lambda is working. We need to add this in IOSPlatformCompilerPreSetup.h as well as MacPlatformCompilerPreSetup.h (look for those in engine Folder,open These and edit them in visual Studio) Just add this at the end of those files:
// Apple LLVM 9.1.0 (Xcode 9.3)
#if (clang_major > 9) || (clang_major == 9 && clang_minor >= 1)
#pragma clang diagnostic ignored “-Wunused-lambda-capture”
#endif