Main Thread Checker warning with CoreMotion, only appearing on 2018 model iPhones Main Thread Checker warning with CoreMotion, only appearing on 2018 model iPhones ios ios

Main Thread Checker warning with CoreMotion, only appearing on 2018 model iPhones


ios iphone xcode core-motion

New answer when using iOS 13

I have tested this just now with the newly released iOS 13 version (17A577) on a 2018 device and it no longer produces the threading error.

Previous answer when using iOS 12

This is a known issue that has been reported to Apple with a radar linked here.

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