SKProductsRequestDelegate methods no longer called from main thread

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Created Sep ’19

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Up until recently it seemed reasonable to assume that all StoreKit observer and delegate methods were called on the main thread. I'm not sure if this was documented, but I had ASSERTs in the relevant methods to check this was the case and they never fired.

Since updating to iPadOS 13.1 I have discovered that the productsRequest:didReceiveResponse: and requestDidFinish: methods of SKProductsRequestDelegate are no longer called from the main thread. It's best to assume that request:didFailWithError: is also affected, although I haven't tested it.

Given that these methods are typically used to update application state, it's now necessary to ensure this is performed in a thread-safe manner. I think the least intrusive solution would be to schedule the work to be performed on the main thead using dispatch_async(dispatch_get_main_queue(), ...).

I'd be interested to know if anyone else can confirm this.

Answered by Macho Man Randy Savage in 385181022

The Storekit methods on macOS were always called on a background thread. Always thought it was strange that they called the methods on the main thread on iOS and on a background thread on macOS. Guess it's the same on both platforms now?

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Answer 1

zath OP

Sep ’19

We're seeing the same thing in our application, and indeed it also applies to the request:didFailWithError: delegate function.

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Answer 2

Macho Man Randy Savage OP

Sep ’19

Accepted Answer

The Storekit methods on macOS were always called on a background thread. Always thought it was strange that they called the methods on the main thread on iOS and on a background thread on macOS. Guess it's the same on both platforms now?

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Answer 3

rainrambler OP

Oct ’19

We just started seeing this in our appn as well. Looks like a behavior change and at least a bug in the developer documentation; observed on iOS 13.1.2, iPhone SE

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Answer 4

futile OP

Oct ’19

Thanks for confirming this behaviour. Out of interest, have you seen anything in the developer documentation which explicitly mentions the threading model for SKProductsRequestDelegate?

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Answer 5

wulilio OP

Nov ’19

i run to this only on macOS

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Answer 6

risingtide OP

Jul ’20

The doc for SKProductsRequestDelegate (https://developer.apple.com/documentation/storekit/skproductsrequestdelegate) mentions threading considerations.

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