Will these warnings in xcode cause issues when I publish my app?
Warnings: Semantic Issue, Format String Issue
They seem minor, but just double checking.
As Apple releases improved versions of the Clang compiler, new issues may be exposed in your code. These are most likely issues that the Unity team will address in future updates when generating the iOS project; I’d image the Unity team strives for zero warnings. The semantic issues are likely areas where Apple has tightened up their code analysis. Format String Issue would be a case where the format specifier does not match the provided argument to one of the printf variants and could be serious.