Macros

This macro provides conformance of the CaseIterable protocol to enums, including those with associated values.

In the example below, applying @AutoCaseIterable to this enum provides automatic CaseIterable conformance, even though these cases have associated values.

For associated values, default values are chosen in this order:

1. A default value written on the case parameter (case x(Foo = .bar)) is used verbatim. This is the recommended way to handle nested enums and Swift types which have no default init() available, such as URL.
2. Optional types use nil.
3. Numeric types use 0.
4. String uses "".
5. Bool uses false.
6. Other types use .init() (works for structs whose properties are all Optional or have default values).

Usage:

   @AutoCaseIterable
   enum InterfaceType {
      case inputField(value: String)
      case modeButton(mode: Mode)
      case media(URL = URL(string: "https://apple.com")!)
      case divider
    }