the same problem make crazy.finally, i find put the 'import xxx.h' in implementation instead of interface can fix the problem.And if you use Cocoapods to manager your project.you can add
s.user_target_xcconfig = { 'CLANG_ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES' => 'YES' }
in your 'xxx.podspec' file.