EXC_BAD_ACCESS. The error is generally caused by automatic release, which is essentially a memory management problem.
SIGABRT. errors are generally caused by Invalid methods or attributes of the object or type.
For example, [NSNull null] length will cause this problem, because this object does not have the length method
App + lib development application:
When the ios release version is generated, if the lib is changed and the app is not changed, it is possible that the generated app is the referenced old lib. We recommend that you add a space somewhere in the app code and re-compile the app, the generated app references the latest lib;
In the debug or Simulator version, you need to delete the original production file, otherwise there will be old app and old lib;
Xcode symbol not found
The index file of the Project is corrupted ~ /Library/Developer/Xcode/DerivedData: Delete the folder of the project.
