swift - switch 语句：在 swift 中从 if 语句转换为 switch 语句

Question

我正在尝试从下面的 if 语句转换为 switch 语句，但我不断收到错误。

let meal = "breakfast"

if meal == "breakfast" {
    print("Good morning!")
} else if meal == "lunch" {
    print("Good afternoon!")
} else if meal == "dinner" {
    print("Good evening!")
} else {
    print("Hello!")
} 

这是我的 switch 语句：

switch meal {
let meal = "breakfast"

    case 1: 
        print("Good morning!”)
    case 2: 
        print("Good afternoon!")
    case 3: 
        print("Good evening!")
}

标签： swiftswitch-statementcontrol-flow

Answer 1

  let meal = "breakfast"

   switch meal {

   case "breakfast":

         print("Good morning")

   case "lunch":

          print("Good afternoon!")

   case "dinner":
          print("Good evening!")
   default:

          print("default case")
   }

将此开关块放入您的代码中:)