Create SwiftUI View extensions to apply each shader more easily

[Paul Hudson]

The goal here is to make the shaders easily to apply by wrapping them in View extensions. So, rather than writing this:

Image(systemName: "figure.walk.circle")
    .font(.system(size: 300))
    .colorEffect(
        ShaderLibrary.checkerboard(
            .color(.red),
            .float(50)
        )
    )

Users might* instead write this:

Image(systemName: "figure.walk.circle")
    .font(.system(size: 300))
    .checkerboardEffect(size: 50, replacement: .red)

I've put the asterisk next to "might" because that's just a suggestion for the spelling. Other options that come to mind:

• .checkerboard() <-- Might mean some shaders clash with other modifiers?
• .infernoEffect(.checkerboard(size: 50, replacement: .red)) <-- uses enum associated values, and means we have only one top-level View modifier rather than one for each shader.

Two tips:

1. You don't need to convert them all. In fact, it's better to convert a small number at a time then commit that change, to avoid clashes with other developers.
2. You're welcome to submit other API naming ideas – I'd rather have a discussion about it and reach a consensus than just dive in with the first option that comes to mind 🙂

Thank you!