ios xcode foundation frame run error

If you accidentally modify the system library files, do not panic, look at the following solutions.

 

first: Of course it is used "command + Z"

If not, look below：

1、enter preferences(command + ,) , click location button

 

2、select first row(Default Data), and then click Right arrow enter the path，you can look at the DerivedData file , Select all the files inside DerivedData and delete.

 

 

 

3、last: clean and build your project.....

If not, reinstall Xcode.