🅿️CaseIterable+ext

🌀Extensions

case.next()

extension CaseIterable where Self: Equatable {
    /// next case (circular)
    public func next() -> Self {
        let cases = Self.allCases
        let i = cases.firstIndex(of: self)!
        var j = cases.index(after: i)
        if j == cases.endIndex { j = cases.startIndex }
        return cases[j]
    }
}

🔗 Learn SwiftUI using Swift Playgrounds

CaseIterable.randomCase

extension CaseIterable {
	static var randomCase: AllCases.Element {
		return allCases.randomElement()!
	}
}

🔗 Enumerating enum cases in Swift

📘參考資料

1. CaseIterable - Swift