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I'm using a custom iOS NavigationRenderer to intercept navigation and make adjustments to pages before they are rendered. I can override OnPushAsync(), OnPopViewAsync() and OnPopToRoot(), but there is no OnInsertPageBefore() method.
I have been able to create a workaround that works for my particular use case. I only ever insert new pages at the root, and I always navigate to them via the Navigation#PopToRootAsync() method, which means I can adjust it in my renderer by overriding OnPopToRoot().
If nothing else, there should be a protected virtual OnInsertPageBefore(Page, Page) in iOS NavigationRenderer for the sake of consistency.
Thank you for your feedback! As this has been classified as an enhancement request, it would be best suited as a UserVoice suggestion or a proposal in our Evolution forum for future consideration. When submitting a proposal on the Evolution forum, be sure to first read the contribution guidelines so your proposal is ready for discussion with the Forms team and community.