错误提示
This app contains an app extension with an illegal bundle identifier. App extension bundle identifiers must have a prefix consisting of their containing application's bundle identifier followed by a '.'.
新换了一个测试机出现这个问题，clean也无法解决
cd ~/Library/Developer/Xcode/DerivedData
find . -name "*.appex" -exec rm -fr {} \;//删除了DerivedData文件夹的内容
然后在重新构建项目就完全么有问题了
