如何在Swift中编写一个空案例？

Question

由于swift没有通过case语句switch,如何在不出错的情况下编写空的case语句？

let a = 50
switch a {
case 0..10:
case 10..100:
    println("between 10 and 100")
default:
    println("100 and above")
}

如何让第一种情况停止开关？

Answer 1

let a = 50
switch a {
case 0..10:
    break // Break the switch immediately
case 10..100:
    println("between 10 and 100")
default:
    println("100 and above")
}

关键字break是可选的,但在这种情况下不是:)

Answer 2

为了防止错误:

Case label in a switch should have at least one executable statement

...使用()案例标签,如下例所示.也适用于default标签.

let a = 1
switch a {
case 1:
    ()
case 2:
    println("2")
default:
    ()
}