Hero Transitions (aka matchedGeometryEffect)

[davdroman]

I believe there's real potential for the library to introduce Hero Transitions for push and pop.

This would be made possible by allowing access to the subviews of the origin and destination TransientViews.

TransientView in itself is only a wrapper around the UIView being animated, so one could easily expose further "child" TransientViews by tagging them with a SwiftUI modifier to be extracted. This can either be via the existing accessibility identifiers or an entirely new strongly-typed ID type:

// rough API idea
// fromView is of type TransientView.
fromView.subview(withAccessibilityIdentifier: "logo") // specific subview as TransientView that can now be animated
fromView["logo"] // theoretical shorthand syntax for the above

// identifiers could be made to be strongly typed and specifically applied to views via a modifier 
.navigationTransitionID(.logo) // .logo could be a user-defined enum case conforming to some vended protocol

[Christopher-A]

@davdroman Have you had any time to think more on this? As SwiftUI matures, designs are getting more complex and a matched geometry effects across navigation transitions are a hotly requested feature.

[davdroman]

@Christopher-A before I delve into hero transitions, I need to do some preliminary work to enable custom transitions for more modes of presentation (.sheet, .fullScreenCover, etc.). Cautiously optimistic to have it all ready by end of summer.

[davdroman]

An update on this.

I won't be able to make it for end of summer anymore, as I'm now winding down to become a dad in about a month and my life is about to be quite hectic for a good few months. I'll still carve some time out for general maintenance and bugfixing, but I won't have time to incorporate new features until sometime next year.

I hope this isn't too much of a disappointment, and thank you for your understanding.

[Christopher-A]

Congratulations! Fatherhood will be the hardest thing you will ever do. Thankfully it’s also the best!