Migrating to v3 of the Apple runtime should be fairly straightforward. See the sections below on concerns you may need to look out for to change to your app if you upgrade.

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Enums Naming

Starting in v3, the Layout option enums have changed to match enum naming conventions from the other runtimes for consistency. See below for what you should change Fit and Alignment options to. There are also a few other enums for parameters that have changed slightly regarding loop modes and direction.
FitBeforeAfter
Fill.fitFill.fill
Contain.fitContain.contain
Cover.fitCover.cover
Fit Width.fitFitWidth.fitWidth
Fit Height.fitFitHeight.fitHeight
Scale Down.fitScaleDown.scaleDown
None.fitNone.noFit
AlignmentBeforeAfter
Top Left.alignmentTopLeft.topLeft
Top Center.alignmentTopCenter.topCenter
Top Right.alignmentTopRight.topRight
Center Left.alignmentCenterLeft.centerLeft
Center.alignmentCenter.center
Center Right.alignmentCenterRight.centerRight
Bottom Left.alignmentBottomLeft.bottomLeft
Bottom Center.alignmentBottomCenter.bottomCenter
Bottom Right.alignmentBottomRight.bottomRight
Loop ModeBeforeAfter
One ShotloopOneShotoneShot
LooploopLooploop
Ping PongloopPingPongpingPong
AutoloopAutoautoLoop
DirectionBeforeAfter
BackwardsdirectionBackwardsbackwards
ForwardsdirectionForwardsforwards
AutodirectionAutoautoDirection

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Default playing behavior

One changed default behavior in v3 is what plays in the Rive canvas. Before v3, if no state machine or specific animation was specified when setting up the RiveViewModel, the first animation made in the Rive file would play. With v3, if no state machine or specific animation is specified, the first state machine (if one is created) in the Rive file will play. So if you prefer to keep your existing default behavior of the first animation, simply set the animationName property on RiveViewModel when creating it.