"But my colleague finds a very interesting fact that Facebook and Instagram can access the same app group."
They are both owned by Facebook (or Meta, as they call themselves now)
Solublepeter
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It is worsened by the awful bug-reporting system. If they had a way to say "We know about this problem, it will be fixed in the next update" that would save so much developer angst.
McCunes audiolooper is in Objective C, the question was about Swift