基本用法

let number = 3
switch number {
case 1:
    print("One!")
case 2:
    print("Two!")
case 3:
    print("Three!")
default:
    print("Not One, Two or Three")
}

switch 语句也适用于整数以外的数据类型。它们适用于任何数据类型。这是一个打开字符串的示例:

let string = "Dog"
switch string {
case "Cat", "Dog":
  print("Animal is a house pet.")
default:
  print("Animal is not a house pet.")
}

这将打印以下内容:

Animal is a house pet.