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I use that rainbow for a waiting animation. This will be fun to play with.

The "signature" SFSymbol showcases this effect so well.

Another great example: "scribble.variable" with a .green.gradient foregroundStyle. Showcasing another new addition to iOS 26. Gradient foregroundStyles on symbols!

This effect is flexible! For example, you can tell the effect to draw each layer individually by applying the symbol effect like this: .symbolEffect(.drawOn.individually, isActive: isShowing)