这是swift3.0官方文档协议那一节给出的协议
protocol ExampleProtocol {
var simpleDescription: String { get }
func adjust()
}
所留练习: 写一个实现这个协议的枚举 用的很多方法 都没实现(本人悟性比较低), 最后在网上找了相关文章 终于实现了 记录下来以便以后查看
enum SimpleEnum: ExampleProtocol {
case Result(String)
case Failure(String)
var simpleDescription: String{
get {
switch self {
case .Result("123"):
return "13"
case .Failure("zhang"):
return "zhang"
default:
return "get error"
}
}
set {
switch self {
case .Result("123"):
self = .Result("12")
case .Failure("zhang"):
self = .Failure("zhang")
default:
self = .Failure("1333")
}
}
}
// case sime
mutating func adjust() {
switch self {
case let .Result(text):
self = .Result(text + " (first case adjusted)")
case let .Failure(text):
self = .Failure(text + " (second case adjusted)")
}
}
}
var enumConformToProtocolTest = SimpleEnum.Failure("zhang")
//enumConformToProtocolTest.simpleDescription
enumConformToProtocolTest.adjust()
enumConformToProtocolTest.simpleDescription
print(enumConformToProtocolTest)
enumConformToProtocolTest = SimpleEnum.Result("ThirdVal")
enumConformToProtocolTest.simpleDescription
enumConformToProtocolTest.adjust()
enumConformToProtocolTest.simpleDescription
