animation+ex.swift

private struct EquatableArray: Equatable {
    private var values = [Any]()
    private var compares = [(Any) -> Bool]()

    mutating func append<T: Equatable>(_ value: T) {
        values.append(value)
        compares.append { ($0 as? T) == value }
    }

    static func == (lhs: EquatableArray, rhs: EquatableArray) -> Bool {
        lhs.values.count == rhs.values.count && zip(lhs.compares, rhs.values).allSatisfy { $0($1) }
    }
}

extension View {
    /// A version of `.animation(_:value:)` that accepts multiple equatable values.
    ///
    /// Usage:
    ///
    ///     .animation(.spring(), values: boolValue, intValue, enumValue, stringValue, ...)
    public func animation<each T: Equatable>(_ animation: Animation?, values: repeat each T) -> some View {
        var equatableArray = EquatableArray()
        for value in repeat each values {
            equatableArray.append(value)
        }
        return self.animation(animation, value: equatableArray)
    }
}