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StatePattern.swift
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StatePattern.swift
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//
// StatePattern.swift
// Design-Patterns
//
// Created by liupengkun on 2020/5/11.
// Copyright © 2020 刘朋坤. All rights reserved.
//
/*
在状态模式(State Pattern):允许一个对象在其内部状态改变时,改变它的行为。
*/
import UIKit
protocol StateProtocol {
func wakeUp()
func sleeping()
func coding()
func eating()
}
class Coder: StateProtocol {
var state: StatePattern?
func wakeUp() {
state?.wakeUp()
}
func sleeping() {
state?.sleeping()
}
func coding() {
state?.coding()
}
func eating() {
state?.eating()
}
}
class StatePattern: StateProtocol {
var coder:Coder?
init(coder: Coder) {
self.coder = coder
}
func wakeUp() {
print("睡醒了")
coder?.state = StateAwakePattern.init(coder: coder!)
}
func sleeping() {
print("开始睡觉")
coder?.state = StateSleepingPattern.init(coder: coder!)
}
func coding() {
print("开始编码")
coder?.state = StateCodingPattern.init(coder: coder!)
}
func eating() {
print("开始吃饭")
coder?.state = StateEatingPattern.init(coder: coder!)
}
}
class StateAwakePattern: StatePattern {
override func wakeUp() {
print("已经睡醒了,无法更改状态")
}
}
class StateSleepingPattern: StatePattern {
override func sleeping() {
print("已经睡着了,无法更改状态")
}
override func coding() {
print("已经睡着了,无法再 coding")
}
override func eating() {
print("已经睡着了,无法再 eating")
}
}
class StateCodingPattern: StatePattern {
override func wakeUp() {
print("已经睡醒了,无法更改状态")
}
override func coding() {
print("已经在编码了,无法更改状态")
}
}
class StateEatingPattern: StatePattern {
override func wakeUp() {
print("已经睡醒了,无法更改状态")
}
override func eating() {
print("已经在吃饭了,无法更改状态")
}
}