MMF help states: It is advisable to use "Can payments be made?" in any event where you want to query the store for information or request for payments.
Instead of using this condition along with any Appstore request, can we put all Appstore events in a group and continuously check if payments can be made or not? This would allow to enable the Appstore group or show an error message, depending on the current state. Seems to be more elegant and effective to me, does anything speak against it?
Apple does not really give any information about how efficient the test if purchases are available is. I would myself only do it at the start of the frame and before any purchases.
You can do the grouping just fine, but I would maybe only do it once a second maybe (and when the user wants to do anything related to the store)
Thanks for the advice! Just want to be sure about these details, should also be interesting for others who want to use in-app-purchase:
I'll check for connection problems only in intervalls (to show error message/disable buy buttons).
I'll check for "Can Payments be made"
- on start of frame (enabling buy buttons and product info requests)
- in intervalls after a disconnection was detected (to allow Appstore requests again, covering special cases where connection was interrupted, WLAN was just started and took some time to initialize etc.)
- when requesting payment, product info or using restore transactions
but NOT in addition to events like "On any item event", "On specific item event" or "Restore payment finished/failed"
Did I get this right?
Yes that seems correct
The events "On any item event" and similar wouldn't even fire if the device didn't have internet connection (with exception of the failure events).
In either way, the triggered events doesn't need the 'Can payments be made' condition. It should only be used before attempting to access the store.
Ok, thanks for checking this!
Does an app get rejected if it shows purchases whilst offline?
I don't know but I wouldn't think so. You should at least notify the user that purchases cannot be made at the current time in some way. Maybe grey out the purchase buttons and display a notification icon and string at the bottom of the screen?
I made a separate screen for the Appstore stuff. It shows a "Loading data from Appstore" message by default and the buy button only appears after a successful "On Request Response" along with the item description and price. Hope that's ok for approval.
I'm having a problem with "Can Payments Be Made." I have an event like this:
Can Payments Be Made?-----> Make purchase button visible
Very simple. But even when I set my phone to Airplane mode the purchase button is visible. I'm using this because if I don't, when I do a "request information" while in airplane mode (to simulate no internet connection) the app crashes (iPhone4). So I don't even want to be able to get to the Purchase screen if there's no internet.
Anyone have any ideas on what I might be doing wrong?
Can't check my code right now to see how I cover connection problems. I'm wondering if we interpret this condition correctly, look at these docs. Are we wrong, is it only about the general setting (IAPs can be deactivated) but not about connection issues?
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