Datadog RUM - swizzle() - main thread UI responsiveness issue about dd-sdk-ios HOT 5 CLOSED

Hi @asetiyadi-MLB 👋

This code path is invoked when a user touches the screen and the warning appears to be from the previousImplementation. The previousImplementation is calling the implementation of UIApplication.sendEvent, so I suspect that something is blocking the main thread there.

Do you override the UIApplication.sendEvent yourself? if not, do you use any other third-party library that could be swizzling the UIApplication.sendEvent method?

Do you have by any chance a sample project that reproduces the issue? it could be helpful to validate that the problem is coming from the Datadog SDK.

Thanks for your help!

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@maxep We did not override UIApplication.sendEvent and does not look like any other third party library use it from the global search as shown below.

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Hi @asetiyadi-MLB 👋

I'm unable to reproduce the runtime warning, I have tested with multiple sample projects. Do you have one that reproduces this that you could share with us?

Thank you for your help on this!

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@maxep Sorry for the delay in responding.
I have also tried to create a new sample project and use 2.7.1 and not able to reproduce the issue. Certainly is still happening on my main project. Based on your observation, what are the possible causes for this that I can pursue and dig deeper into?

FYI .. we use other third party SPMs like Firebase and OneSignal. I did check your initial suggestion if any other third party is using UIApplication.sendEvent and none other than Datadog.

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Hey @asetiyadi-MLB

It's hard to tell, but it might be something on a Button or gesture callback that perform I/O operation in sync, such as reading or writing a file.

I'm closing this ticket since it doesn't seem to be related to our SDK, but feel free to add any finding.

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