application state being called from background thread

[romk1n]

We getting this warning in the log can you guys check your code?

Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]

[djih]

@romk1n thanks for reporting. What version of the SDK are you on?

[TimothyDavidW]

Hi I am also experiencing this on 4.0.1 after updating to ios11.

Backtrace:
4 Amplitude_iOS 0x000000010537c8f4 -[Amplitude initializeApiKey:userId:setUserId:] + 684
5 Amplitude_iOS 0x000000010537c580 -[Amplitude initializeApiKey:] + 84

line 480 in the amplitude.m is where this is occurring.

[romk1n]

@djih sorry missed your message it is latest and previous version. Thanks.

[danielgalasko]

Any update on this? Its actually crashing our CI now for some reason

[djih]

@danielgalasko @romk1n I have a fix on a branch. I've tested it myself in our demo app but if you guys have a chance can you test it out? To install via Cocoapods: pod 'Amplitude-iOS', :git => 'https://github.com/Amplitude/Amplitude-iOS.git', :branch => 'main-thread-violation'. Otherwise I will just merge it and release a new version EOD today, thanks

[djih]

This is fixed with v4.0.2 thanks!

[danielgalasko]

awesome stuff!!! Thanks for the release @djih 🙌

[romk1n]

@djih thanks, I just tried new version and still receiving the warning [reports] Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]

[djih]

@romk1n do you have more information like stack trace? When investigating the issue I was able to reproduce the warning in our iOS Demo app, and I verified that the fix stops the warning.