book

Pro Design Patterns in Swift

Name: Pro Design Patterns in Swift
Author: Adam Freeman
ISBN: 9781484203941

by Adam Freeman

January 2015

Intermediate to advanced

592 pages

13h 5m

English

Apress

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Cover
Title
Copyright
Dedication
Contents at a Glance
Contents
About the Author
About the Technical Reviewer
Part I: Getting Ready
Chapter 1: Understanding Design Patterns
Putting Design Patterns into ContextIntroducing Design PatternsUnderstanding the Structure of a Design PatternQuantifying the Value of Design PatternsUsing a Design Pattern After the Problem OccurredUnderstanding the Limitations of Design PatternsAbout This BookWhat Do You Need to Know?What Software Do You Need?What Is the Structure of This Book?Where Can You Get the Example Code?Summary

Chapter 2: Getting Used to Xcode
Working with Xcode PlaygroundsCreating a PlaygroundDisplaying the Value History of a VariableUsing the Value TimelineDisplaying UI Components in a PlaygroundWorking with OS X Command Line Tool ProjectsCreating a Command-Line ProjectUnderstanding the Xcode LayoutAdding a New Swift FileSummary
Chapter 3: Creating the SportsStore App
Creating an Unstructured iOS App ProjectCreating the ProjectUnderstanding the Xcode LayoutDefining the DataCreating the Basic LayoutAdding the Basic ComponentsConfiguring Auto LayoutTesting the Basic LayoutImplementing the Total LabelCreating the ReferenceUpdating the DisplayImplementing the Table CellsDefining the Custom Table Cell and LayoutSetting the Table Cell Layout ConstraintsCreating the Table Cell Class and OutletsImplementing the Data Source ProtocolRegistering the Data SourceTesting the Data SourceHandling the Editing ActionsHandling the EventsTesting the SportsStore AppSummary
Part II: The Creation Patterns
Chapter 4: The Object Template Pattern
Preparing the Example ProjectUnderstanding the Problem Addressed by the PatternUnderstanding the Object Template PatternImplementing the Object Template PatternUnderstanding the Benefits of the PatternThe Benefit of DecouplingThe Benefit of EncapsulationThe Benefit of an Evolving Public PresentationUnderstanding the Pitfalls of the PatternExamples of the Object Template Pattern in CocoaApplying the Pattern to the SportsStore AppPreparing the Example ApplicationCreating the Product ClassApplying the Product ClassExpanding the Summary DisplaySummary
Chapter 5: The Prototype Pattern
Understanding the Problem Addressed by the PatternIncurring Expensive InitializationsCreating Template DependenciesUnderstanding the Prototype PatternImplementing the Prototype PatternCloning Reference TypesUnderstanding Shallow and Deep CopyingCopying ArraysUnderstanding the Benefits of the Prototype PatternAvoiding Expensive InitializationsSeparating Object Creation from Object UseUnderstanding the Pitfalls of the Prototype PatternUnderstanding the Deep vs. Shallow PitfallUnderstanding the Exposure Distortion PitfallUnderstanding the Nonstandard Protocol PitfallExamples of the Prototype Pattern in CocoaUsing Cocoa ArraysUsing the NSCopying Property AttributeApplying the Pattern to the SportsStore AppPreparing the Example ApplicationImplementing NSCopying in the Product ClassCreating the Logger ClassLogging Changes in the View ControllerTesting the ChangesSummary
Chapter 6: The Singleton Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Shared Resource Encapsulation ProblemUnderstanding the Singleton PatternImplementing the Singleton PatternThe Quick Singleton ImplementationCreating a Conventional Singleton ImplementationDealing with ConcurrencyUnderstanding the Pitfalls of the Singleton PatternUnderstanding the Leakage PitfallUnderstanding the Shared Code File PitfallUnderstanding the Concurrency PitfallsExamples of the Singleton Pattern in CocoaApplying the Pattern to the SportsStore ApplicationProtecting the Data ArrayProtecting the CallbackDefining the SingletonSummary
Chapter 7: The Object Pool Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Object Pool PatternImplementing the Object Pool PatternDefining the Pool ClassConsuming the Pool ClassUnderstanding the Pitfalls of the Object Pool PatternExamples of the Object Pool Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationCreating the (Fake) ServerCreating the Object PoolApplying the Object PoolSummary
Chapter 8: Object Pool Variations
Preparing the Example ProjectUnderstanding the Object Pool Pattern VariationsUnderstanding the Object Creation StrategyUnderstanding the Object Reuse StrategyUnderstanding the Empty Pool StrategyUnderstanding the Allocation StrategyUnderstanding the Pitfalls of the Pattern VariationsUnderstanding the Expectation Gap PitfallUnderstanding the Over- and Under-utilization PitfallsExamples of the Pattern Variations in CocoaApplying a Pattern Variation to SportsStoreSummary
Chapter 9: The Factory Method Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Factory Method PatternImplementing the Factory Method PatternDefining a Global Factory MethodUsing a Base ClassVariations on the Factory Method PatternUnderstanding the Pitfalls of the PatternExamples of the Factory Method Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationImplementing the Factory Method PatternConsuming the Factory Method PatternSummary
Chapter 10: Abstract Factory Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Abstract Factory PatternImplementing the Abstract Factory PatternCreating the Abstract FactoryCreating the Concrete FactoriesCompleting the Abstract FactoryConsuming the Abstract Factory PatternVariations on the Abstract Factory PatternHiding the Abstract Factory ClassApplying the Singleton Pattern to the Concrete FactoriesApplying the Prototype Pattern to the Implementation ClassesUnderstanding the Pitfalls of the PatternExamples of the Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Implementation Protocols and ClassesDefining the Abstract and Concrete Factory ClassesConsuming the Factories and Implementation ClassesSummary
Chapter 11: The Builder Pattern
Preparing the Example ProjectUnderstanding the Problems That the Pattern SolvesUnderstanding the Builder PatternImplementing the Builder PatternDefining the Builder ClassConsuming the BuilderUnderstanding the Impact of the PatternVariations on the Builder PatternUnderstanding the Pitfalls of the Builder PatternExamples of the Builder Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Builder ClassUsing the Builder ClassSummary
Part III: The Structural Patterns
Chapter 12: The Adapter Pattern
Preparing the Example ProjectCreating the Data SourcesDefining the ApplicationUnderstanding the Problem That the Pattern SolvesUnderstanding the Adapter PatternImplementing the Adapter PatternVariations on the Adapter PatternDefining an Adapter as a Wrapper ClassCreating a Two-Way AdapterUnderstanding the Pitfalls of the Adapter PatternExamples of the Adapter Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Adapter ClassUsing the Adapted FunctionalitySummary
Chapter 13: The Bridge Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Bridge PatternImplementing the Bridge PatternDealing with the MessagesDealing with the ChannelsCreating the BridgeAdding a New Message Type and ChannelVariations on the Bridge PatternCollapsing the BridgeUnderstanding the Pitfalls of the Bridge PatternExamples of the Bridge Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationUnderstanding the ProblemDefining the Bridge ClassSummary
Chapter 14: The Decorator Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Decorator PatternImplementing the Decorator PatternVariations on the Decorator PatternCreating Decorators with New FunctionalityCreating Consolidated DecoratorsUnderstanding the Pitfalls of the Decorator PatternThe Side-Effect PitfallExamples of the Decorator Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationCreating the DecoratorsApplying the DecoratorsSummary
Chapter 15: The Composite Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Composite PatternImplementing the Composite PatternApplying the PatternUnderstanding the Pitfalls of the Composite PatternExamples of the Composite Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Composite ClassApplying the PatternSummary
Chapter 16: The Façade Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Façade PatternImplementing the Façade PatternApplying the FaçadeVariations on the Façade PatternUnderstanding the Pitfalls of the Façade PatternExamples of the Façade Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationCreating the Façade ClassApplying the Façade ClassSummary
Chapter 17: The Flyweight Pattern
Preparing the Example ProjectUnderstanding the Problems That the Pattern SolvesUnderstanding the Flyweight PatternImplementing the Flyweight PatternCreating the Flyweight ProtocolCreating the Flyweight Implementation ClassAdding Concurrency ProtectionsCreating the Flyweight Factory ClassApplying the FlyweightVariations on the Flyweight PatternUnderstanding the Pitfalls of the Flyweight PatternUnderstanding the Extrinsic Duplication PitfallUnderstanding the Mutable Extrinsic Data PitfallUnderstanding the Concurrent Access PitfallUnderstanding the Over-optimization PitfallUnderstanding the Misapplication PitfallExamples of the Flyweight Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationCreating the Flyweight Protocol and Implementation ClassCreating the Flyweight FactoryApplying the FlyweightSummary
Chapter 18: The Proxy Pattern
Preparing the Example ProjectUnderstanding the Problems That the Pattern SolvesUnderstanding the Remote Object ProblemUnderstanding the Expensive Operation ProblemUnderstanding the Restricted Access ProblemUnderstanding the Proxy PatternSolving the Remote Object ProblemSolving the Expensive Operation ProblemSolving the Restricted Access ProblemImplementing the Proxy PatternImplementing the Remote Object ProxyImplementing the Expensive Operation ProxyImplementing the Access Restriction ProxyVariations on the Proxy PatternImplementing a Reference Counting ProxyUnderstanding the Pitfalls of the Proxy PatternExamples of the Proxy Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Protocol, Factory Method, and Proxy ClassUpdating the Product Data StoreSending Stock Level UpdatesSummary
Part IV: The Behavioral Patterns
Chapter 19: The Chain of Responsibility Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Chain of Responsibility PatternImplementing the Chain of Responsibility PatternCreating and Providing the Chain of ResponsibilityApplying the Chain of Responsibility PatternVariations on the Chain of Responsibility PatternApplying the Factory Method PatternIndicating Whether Responsibility Was Taken for the RequestNotifying All Links in the ChainUnderstanding the Pitfalls of the PatternExamples of the Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationDefining the Chain and its LinksSummary
Chapter 20: The Command Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Command PatternImplementing the Command PatternDefining the Command ProtocolDefining the Command Implementation ClassApplying the Command PatternApplying Concurrent ProtectionsUsing the Undo FeatureVariations on the Command PatternCreating Composite CommandsUsing Commands as MacrosUsing Closures as CommandsUnderstanding the Pitfalls of the Command PatternExamples of the Command Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationImplementing the Undo FeatureSummary
Chapter 21: The Mediator Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Mediator PatternImplementing the Mediator PatternDefining the Meditator ClassConforming to the Peer ProtocolImplementing Concurrency ProtectionsVariations on the Mediator PatternPutting More Logic Into the MediatorGeneralizing the Mediator-Peer RelationshipUnderstanding the Pitfalls of the Mediator PatternThe Single Protocol PitfallExamples of the Mediator Pattern in CocoaApplying the Pattern to the SportsStore ApplicationSummary
Chapter 22: The Observer Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Observer PatternImplementing the Observer PatternCreating the Base Subject ClassConforming to the Subject ProtocolConforming to the Observer ProtocolConsuming the PatternVariations on the Observer PatternGeneralizing NotificationsUsing Weak ReferencesDealing with Short-Lived SubjectsUnderstanding the Pitfalls of the Observer PatternExamples of the Observer Pattern in CocoaUser Interface EventsObserving Property ChangesApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationApplying the PatternSummary
Chapter 23: The Memento Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Memento PatternImplementing the Memento PatternImplementing the Memento ClassUsing the MementoVariations on the Memento PatternUnderstanding the Pitfalls of the Memento PatternExamples of the Memento Pattern in CocoaApplying the Pattern to the SportsStore ApplicationPreparing the Example ApplicationImplementing the PatternSummary
Chapter 24: The Strategy Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Strategy PatternImplementing the Strategy PatternDefining the Strategies and the Context ClassConsuming the PatternVariations on the Strategy PatternUnderstanding the Pitfalls of the Strategy PatternExamples of the Strategy Pattern in CocoaCocoa Protocol-Based StrategiesCocoa Selector-Based StrategiesApplying the Pattern to the SportsStore ApplicationSummary
Chapter 25: The Visitor Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Visitor PatternImplementing the Visitor PatternConforming to the Shape ProtocolCreating the VisitorsApplying the VisitorsVariations on the Visitor PatternUnderstanding the Pitfalls of the Visitor PatternExamples of the Visitor Pattern in CocoaApplying the Pattern to the SportsStore ApplicationSummary
Chapter 26: The Template Method Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the Template Method PatternImplementing the Template Method PatternVariations on the Template Method PatternUnderstanding the Pitfalls of the PatternExamples of the Template Method Pattern in CocoaApplying the Pattern to the SportsStore ApplicationSummary
Part V: The MVC Pattern
Chapter 27: The Model/View/Controller Pattern
Preparing the Example ProjectUnderstanding the Problem That the Pattern SolvesUnderstanding the MVC PatternUnderstanding the MVC Application SectionsImplementing the MVC PatternDefining the Common CodeDefining the FrameworkCreating the ModelDefining the ViewDefining the ControllerCompleting the FrameworkRunning the ApplicationExtending the ApplicationVariations on the MVC PatternUnderstanding the Pitfalls of the MVC PatternExamples of the MVC Pattern in CocoaSummary
Index

Overview

The Swift programming language has transformed the world of iOS development and started a new age of modern Cocoa development. Pro Design Patterns in Swift shows you how to harness the power and flexibility of Swift to apply the most important and enduring design patterns to your applications, taking your development projects to master level.

This book will teach you those design patterns that have always been present at some level in your code, but may not have been recognized, acknowledged, or fully utilized. Implementation of specific pattern approaches will prove their value to any Swift developer.

Best-selling author Adam Freeman explains how to get the most from design patterns. He starts with the nuts-and-bolts and shows you everything through to advanced features, going in-depth to give you the knowledge you need.

Pro Design Patterns in Swift brings design patterns to life and shows you how to bring structure and scale to your Swift code with a practical, no-nonsense approach.

In this book, you’ll learn:

Gain a solid, practical understanding of why and when design patterns are useful

Master classic patterns like singleton, abstract factory, chain of responsibility, and observer

Discover less well-known patterns like memento, composite, command, and mediator

Understand how Swift provides essential language features for writing well-structured code that is easy to understand, simple to test and readily maintainable.

Learn how to consume the Cocoa API to implement classic design patterns

Build on your existing programming knowledge to get up and running with design patterns in Swift quickly and effectively

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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