It seems more a behavior controlled by the operating systems than the app but maybe you can replicate it inside your own app. It's just a guess.
Could you test it please? I think it's just a matter of changing a theme in your app from Material Design to Cupertino.
I don't know how, I don't have an iPhone...
I'll check tonight if I can come up with demo that could work on the emulator or something.
, I did a test. The dialog blurs the background. I think this is the issue when they implemented it: github.com/flutter/flutter/pull/18381
Screenshots from the iOS Simulator:
Screenshot from my Android Phone:
Since widgets are rendered by a 2D library you can effectively use iOS widgets on Android and viceversa, even if you shouldn't :D
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