$ pod install
Analyzing dependencies
dyld: lazy symbol binding failed: Symbol not found: _ffi_prep_closure_loc
Referenced from: /usr/local/lib/ruby/gems/2.7.0/gems/ffi-1.14.2/lib/ffi_c.bundle
Expected in: /usr/lib/libffi.dylib
dyld: Symbol not found: _ffi_prep_closure_loc
Referenced from: /usr/local/lib/ruby/gems/2.7.0/gems/ffi-1.14.2/lib/ffi_c.bundle
Expected in: /usr/lib/libffi.dylib
Abort trap: 6解決方案：
gem install ffi -- --disable-system-libffi