Swift 中开关盒的详尽条件

Swift 中开关盒的详尽条件

swift
switch value {
case pattern1:
    // 执行代码块1
case pattern2:
    // 执行代码块2
...
default:
    // 执行默认代码块
}

swift
let score = 85
switch score {
case 0..<60:
    print("不及格")
case 60..<70:
    print("及格")
case 70..<80:
    print("良好")
case 80...100:
    print("优秀")
default:
    print("无效的成绩")
}

swift
enum Permission {
    case read
    case write
    case execute
}
let userPermission = Permission.write
switch userPermission {
case .read:
    print("可以阅读")
case .write:
    print("可以写入")
case .execute:
    print("可以执行")
}

swift
let command = "help"
switch command {
case "start":
    print("启动应用")
case "stop":
    print("停止应用")
case "help":
    print("显示帮助信息")
default:
    print("无效的命令")
}