在swift中有速记条件语法吗?

Question

这是用swift写这个的最短方式吗?

if currentStep == .confirmSignInAttempt1 || currentStep == .confirmSignInAttempt2 || currentStep == .confirmSignInAttempt3

Answer 1

可以使用

if [.confirmSignInAttempt1,.confirmSignInAttempt2,.confirmSignInAttempt3].contains(currentStep)

Answer 2

您可以使用自定义操作符:

if currentStep =|| [.confirmSignInAttempt1, .confirmSignInAttempt2, .confirmSignInAttempt3] { ... }

使用一个简单的中缀操作符实现

infix operator =||
func =||<T: Comparable>(lhs: T, rhs: [T]) -> Bool { rhs.contains(lhs) }