ios:xxxx was compiled with optimization - stepping may behave oddly; variables may not be available.

The error that appears is the problem with the xcode run mode, in the edit scheme

To solve this issue, try following steps:

1. Go to Product Menu

2. Select Scheme From Product Menu

3. Select Edit Scheme From Scheme Option

4. Select Info under Rum mode

5. Select Build Configuration as Debug not a Release Mode