PLCrashReporter
Reliable, open-source crash reporting for iOS, macOS and tvOS
...However, if you want to use PLCrashReporter directly, grab the latest release at the releases page. Crash reports are output as protobuf-encoded messages, and may be decoded using the CrashReporter library or any Google Protocol Buffers decoder. You can use Atos command-line tool to symbolicate the output.