definitions for all of solid principles, more examples

Design Patterns in Swift/Solid/Dependency Inversion Principle.playground/Pages/Worker and manager.xcplaygroundpage/Contents.swift

@@ -0,0 +1,37 @@
+import Foundation
+
+//The Dependency Inversion Principle states that:
+///1. High-level modules should not depend on low-level modules. Both should depend on abstractions.
+///2. Abstractions should not depend upon details. Details should depend upon abstractions.
+
+protocol IWorker {
+
+    func work()
+}
+
+class Worker: IWorker { //low-level
+
+    func work() {
+
+    }
+}
+
+class SuperWorker: IWorker {
+
+    func work() {
+
+    }
+}
+
+class Manager { //high-level
+
+    var worker: IWorker!
+
+    func setWoker(_ worker: IWorker) {
+        self.worker = worker
+    }
+
+    func manage() {
+        worker.work()
+    }
+}

Design Patterns in Swift/Solid/Dependency Inversion Principle.playground/contents.xcplayground

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='5.0' target-platform='ios'>
-    <timeline fileName='timeline.xctimeline'/>
+<playground version='6.0' target-platform='ios'>
+    <pages>
+        <page name='Worker and manager'/>
+        <page name='Relatioship example'/>
+    </pages>
 </playground>

Design Patterns in Swift/Solid/Dependency Inversion Principle.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Design Patterns in Swift/Solid/Interface Segregation Principle.playground/Contents.swift

@@ -1,4 +1,6 @@
-import UIKit
+import Foundation
+
+//No client should be forced to depend on methods it does not use.
 
 class Document {
 

Design Patterns in Swift/Solid/Interface Segregation Principle.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Design Patterns in Swift/Solid/Liskov Substitution Principle.playground/Contents.swift

@@ -1,5 +1,6 @@
-import UIKit
+import Foundation
 
+//Child classes should never break the parent class' type definitions.
 ///Example where is substitution principle is broken
 
 class Rectangle: CustomStringConvertible {

Design Patterns in Swift/Solid/Liskov Substitution Principle.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Design Patterns in Swift/Solid/Open-Closed Principle.playground/Contents.swift → Design Patterns in Swift/Solid/Open-Closed Principle.playground/Pages/Filtering and Specification.xcplaygroundpage/Contents.swift

@@ -1,4 +1,4 @@
-import UIKit
+import Foundation
 
 enum Color {
 

Design Patterns in Swift/Solid/Open-Closed Principle.playground/Pages/Shapes.xcplaygroundpage/Contents.swift

@@ -0,0 +1,49 @@
+import Foundation
+
+//Software entities (classes, modules, functions, etc) should be open for extension, but closed for modification.
+
+protocol Shape {
+
+    func getArea() -> Double
+}
+
+class Rectangle: Shape {
+
+    var length: Double
+    var height: Double
+
+    init(_ length: Double, _ height: Double) {
+        self.length = length
+        self.height = height
+    }
+
+    func getArea() -> Double {
+        return length * height
+    }
+}
+
+class Circle {
+
+    var radius: Double
+
+    init(_ radius: Double) {
+        self.radius = radius
+    }
+
+    func getArea() -> Double {
+        return radius * radius * 3.14
+    }
+}
+
+class AreaManager {
+
+    func calculateArea(shapes: [Shape]) -> Double {
+        var area: Double = 0.0
+
+        for shape in shapes {
+            area += shape.getArea()
+        }
+
+        return area
+    }
+}

Design Patterns in Swift/Solid/Open-Closed Principle.playground/contents.xcplayground

@@ -1,4 +1,7 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<playground version='5.0' target-platform='ios'>
-    <timeline fileName='timeline.xctimeline'/>
+<playground version='6.0' target-platform='ios'>
+    <pages>
+        <page name='Shapes'/>
+        <page name='Filtering and Specification'/>
+    </pages>
 </playground>

Design Patterns in Swift/Solid/Open-Closed Principle.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

Design Patterns in Swift/Solid/Single Responsibility Principle.playground/Contents.swift

@@ -1,5 +1,6 @@
 import Foundation
-import UIKit
+
+//A class should have one, and only one, reason to change.
 
 class Journal: CustomStringConvertible {
 

Design Patterns in Swift/Solid/Single Responsibility Principle.playground/playground.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>