Oh, I didn't know that on iOS the apps is responsible for picking another app to open an resource.
In Android, the app just throws an intent to open something, the OS opens the list of app capable of handling it, the user picks the wanted one (either 'only this time' or 'use this as default next time'). The OS, not the app, then remembers the choice.
> Oh, I didn't know that on iOS the apps is responsible for picking another app to open an resource.
I don't think they are responsible, but you can invoke a specific app if you need. Google's apps keep showing this sheet with "browser choice" quite often, conveniently forgetting that the user keeps setting "don't ask me again".
The choices are: Chrome, Google, Safari, Default system browser.
In Android, the app just throws an intent to open something, the OS opens the list of app capable of handling it, the user picks the wanted one (either 'only this time' or 'use this as default next time'). The OS, not the app, then remembers the choice.