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new example for the Template Pattern
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‎Design-Patterns.playground.zip

6.62 KB
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‎Design-Patterns.playground/Pages/Behavioral.xcplaygroundpage/Contents.swift

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@@ -606,6 +606,77 @@ upper.print("O tempora, o mores!")
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Strategy)
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*/
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/*:
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🍪 Template
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-----------
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The Template Pattern is used when two or more implementations of an
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algorithm exist. The template is defined and then built upon with further
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variations. Use this method when most (or all) subclasses need to implement
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the same behavior. Traditionally, this would be accomplished with abstract
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classes and protected methods (as in Java). However in Swift, because
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abstract classes don't exist (yet - maybe someday), we need to accomplish
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the behavior using interface delegation.
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### Example
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*/
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protocol ICodeGenerator {
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func crossCompile()
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}
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protocol IGeneratorPhases {
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func collectSource()
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func crossCompile()
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}
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class CodeGenerator : ICodeGenerator{
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var delegate: IGeneratorPhases
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init(delegate: IGeneratorPhases) {
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self.delegate = delegate
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}
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//Template method
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final func crossCompile() {
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delegate.collectSource()
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delegate.crossCompile()
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}
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}
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class HTMLGeneratorPhases : IGeneratorPhases {
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func collectSource() {
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print("HTMLGeneratorPhases collectSource() executed")
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}
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func crossCompile() {
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print("HTMLGeneratorPhases crossCompile() executed")
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}
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}
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class JSONGeneratorPhases : IGeneratorPhases {
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func collectSource() {
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print("JSONGeneratorPhases collectSource() executed")
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}
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func crossCompile() {
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print("JSONGeneratorPhases crossCompile() executed")
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}
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}
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/*:
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### Usage
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*/
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let htmlGen : ICodeGenerator = CodeGenerator(delegate: HTMLGeneratorPhases())
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let jsonGen: ICodeGenerator = CodeGenerator(delegate: JSONGeneratorPhases())
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htmlGen.crossCompile()
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jsonGen.crossCompile()
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/*:
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🏃 Visitor
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----------
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‎Design-Patterns.playground/Pages/Structural.xcplaygroundpage/Contents.swift

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@@ -126,9 +126,9 @@ Component
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protocol Shape {
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func draw(fillColor: String)
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}
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/*:
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/*:
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Leafs
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*/
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*/
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final class Square : Shape {
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func draw(fillColor: String) {
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print("Drawing a Square with color \(fillColor)")
@@ -146,11 +146,11 @@ Composite
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*/
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final class Whiteboard : Shape {
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lazy var shapes = [Shape]()
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init(_ shapes:Shape...) {
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self.shapes = shapes
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}
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func draw(fillColor: String) {
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for shape in self.shapes {
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shape.draw(fillColor: fillColor)
@@ -161,7 +161,7 @@ final class Whiteboard : Shape {
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### Usage:
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*/
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var whiteboard = Whiteboard(Circle(), Square())
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whiteboard.draw("Red")
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whiteboard.draw(fillColor: "Red")
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/*:
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🍧 Decorator
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------------
@@ -377,7 +377,7 @@ computer.open(doors: podBay)
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🍬 Virtual Proxy
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----------------
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The proxy pattern is used to provide a surrogate or placeholder object, which references an underlying object.
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The proxy pattern is used to provide a surrogate or placeholder object, which references an underlying object.
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Virtual proxy is used for loading object on demand.
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### Example
@@ -388,7 +388,7 @@ protocol HEVSuitMedicalAid {
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class HEVSuit : HEVSuitMedicalAid {
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func administerMorphine() -> String {
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return "Morphine aministered."
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return "Morphine administered."
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}
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}
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‎README.md

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@@ -13,6 +13,14 @@ A short cheat-sheet with Xcode 8.2 Playground ([Design-Patterns.playground.zip](
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* [Creational](#creational)
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* [Structural](#structural)
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```swift
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Behavioral |
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[Creational](Creational) |
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[Structural](Structural)
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```
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Behavioral
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==========
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@@ -126,6 +134,9 @@ atm.canWithdraw(amount: 30) // Can withdraw - 1x20, 2x10
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Chain-Of-Responsibility)
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```swift
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```
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👫 Command
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----------
@@ -291,6 +302,10 @@ var result = expression.evaluate(context)
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Interpreter)
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```swift
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```
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🍫 Iterator
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-----------
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@@ -403,6 +418,9 @@ spamMonster(message: "I'd Like to Add you to My Professional Network", worker: m
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Mediator)
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```swift
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```
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💾 Memento
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----------
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Observer)
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```swift
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```
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🐉 State
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---------
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-State)
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```swift
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```
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💡 Strategy
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-----------
@@ -678,6 +702,87 @@ upper.print("O tempora, o mores!")
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Strategy)
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```swift
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```
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🍪 Template
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-----------
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The Template Pattern is used when two or more implementations of an
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algorithm exist. The template is defined and then built upon with further
714+
variations. Use this method when most (or all) subclasses need to implement
715+
the same behavior. Traditionally, this would be accomplished with abstract
716+
classes and protected methods (as in Java). However in Swift, because
717+
abstract classes don't exist (yet - maybe someday), we need to accomplish
718+
the behavior using interface delegation.
719+
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721+
### Example
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```swift
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protocol ICodeGenerator {
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func crossCompile()
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}
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protocol IGeneratorPhases {
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func collectSource()
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func crossCompile()
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}
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class CodeGenerator : ICodeGenerator{
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var delegate: IGeneratorPhases
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init(delegate: IGeneratorPhases) {
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self.delegate = delegate
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}
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//Template method
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final func crossCompile() {
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delegate.collectSource()
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delegate.crossCompile()
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}
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}
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class HTMLGeneratorPhases : IGeneratorPhases {
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func collectSource() {
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print("HTMLGeneratorPhases collectSource() executed")
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}
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func crossCompile() {
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print("HTMLGeneratorPhases crossCompile() executed")
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}
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}
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class JSONGeneratorPhases : IGeneratorPhases {
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func collectSource() {
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print("JSONGeneratorPhases collectSource() executed")
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}
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func crossCompile() {
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print("JSONGeneratorPhases crossCompile() executed")
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}
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}
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```
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### Usage
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```swift
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let htmlGen : ICodeGenerator = CodeGenerator(delegate: HTMLGeneratorPhases())
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let jsonGen: ICodeGenerator = CodeGenerator(delegate: JSONGeneratorPhases())
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htmlGen.crossCompile()
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jsonGen.crossCompile()
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```
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🏃 Visitor
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----------
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The "family" of objects created by the factory are determined at run-time.
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### Example
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```swift
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```
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Protocols
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@@ -903,6 +1012,10 @@ let deathStar = DeathStar(builder:empire)
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Builder)
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```swift
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```
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🏭 Factory Method
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-----------------
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Prototype)
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```swift
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```
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💍 Singleton
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------------
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>**Further Examples:** [Design Patterns in Swift](https://github.com/kingreza/Swift-Adapter)
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```swift
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```
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🌉 Bridge
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----------
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func draw(fillColor: String)
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}
11931314
```
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Leafs
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11971318
```swift
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final class Square : Shape {
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func draw(fillColor: String) {
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print("Drawing a Square with color \(fillColor)")
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12161337

12171338
final class Whiteboard : Shape {
12181339
lazy var shapes = [Shape]()
1219-
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12201341
init(_ shapes:Shape...) {
12211342
self.shapes = shapes
12221343
}
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func draw(fillColor: String) {
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for shape in self.shapes {
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shape.draw(fillColor: fillColor)
@@ -1234,7 +1355,7 @@ final class Whiteboard : Shape {
12341355
```swift
12351356

12361357
var whiteboard = Whiteboard(Circle(), Square())
1237-
whiteboard.draw("Red")
1358+
whiteboard.draw(fillColor: "Red")
12381359
```
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🍧 Decorator
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14751596
🍬 Virtual Proxy
14761597
----------------
14771598

1478-
The proxy pattern is used to provide a surrogate or placeholder object, which references an underlying object.
1599+
The proxy pattern is used to provide a surrogate or placeholder object, which references an underlying object.
14791600
Virtual proxy is used for loading object on demand.
14801601

14811602
### Example
@@ -1488,7 +1609,7 @@ protocol HEVSuitMedicalAid {
14881609

14891610
class HEVSuit : HEVSuitMedicalAid {
14901611
func administerMorphine() -> String {
1491-
return "Morphine aministered."
1612+
return "Morphine administered."
14921613
}
14931614
}
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15141635
====
15151636

15161637
📖 Descriptions from: [Gang of Four Design Patterns Reference Sheet](http://www.blackwasp.co.uk/GangOfFour.aspx)
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```swift

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