Malformed or corrupted AST file: ‘Unable to load module "/Users/topbar/Library/Developer/Xcode/DerivedData/ModuleCache/3TJWGBUKOEC41/Darwin.pcm": module file out of date‘

fatal error: malformed or corrupted AST file: ‘Unable to load module "/Users/topbar/Library/Developer/Xcode/DerivedData/ModuleCache/3TJWGBUKOEC41/Darwin.pcm": module file out of date‘

note: after modifying system headers, please delete the module cache at ‘/Users/topbar/Library/Developer/Xcode/DerivedData/ModuleCache/3TJWGBUKOEC41‘

1 error generated.

一段时间没用，今天编译出现这种情况，

解决办法，

• Clean the project
• Touch the project‘s pch file
• Perform a deep clean (Option+Command+Shift+K)
• iOS Simulator > Reset Content and Settings