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Swift 2 Design Patterns

By : Julien Lange
Book Image

Swift 2 Design Patterns

By: Julien Lange

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Swift 2 Design Patterns
Julien Lange
Oct, 2015 | 224 pages
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Table of Contents (15 chapters)
Swift 2 Design Patterns
Swift 2 Design Patterns
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Creational Patterns
Creational Patterns
The prototype pattern
The factory method pattern
The singleton pattern
The abstract factory pattern
The builder pattern
Summary
2
Structural Patterns – Decorator, Proxy, and Bridge
Structural Patterns – Decorator, Proxy, and Bridge
Static and dynamic composition
The decorator pattern
The proxy pattern
The bridge pattern
Summary
3
Structural Patterns – Composite and Flyweight
Structural Patterns – Composite and Flyweight
The composite pattern
The flyweight pattern
Summary
4
Structural Patterns – Adapter and Facade
Structural Patterns – Adapter and Facade
The adapter pattern
The facade pattern
Summary
5
Behavioral Patterns – Strategy, State, and Template Method
Behavioral Patterns – Strategy, State, and Template Method
The strategy pattern
The state pattern
The template method
Summary
6
Behavioral Patterns – Chain of Responsibility and Command
Behavioral Patterns – Chain of Responsibility and Command
The chain of responsibility pattern
The command pattern
Comparison between the chain of responsibility and command patterns
Summary
7
Behavioral Patterns – Iterator, Mediator, and Observer
Behavioral Patterns – Iterator, Mediator, and Observer
The iterator pattern
The mediator pattern
The observer pattern
Summary
8
Behavioral Patterns – Visitor, Interpreter, and Memento
Behavioral Patterns – Visitor, Interpreter, and Memento
The visitor pattern
The interpreter pattern
The memento pattern
Comparing the three patterns
Summary
Index
Index

The memento pattern

The memento pattern will be the last pattern that we will discover together. You will see that this pattern is really interesting to work with and has many uses.

Roles

The role of the memento pattern is to capture an object's internal state and save it externally so that it can be restored later without breaking the encapsulation of this object.

Design

The generic UML class diagram is defined as the following:

Participants

The following are the participants of the memento pattern:

  • Memento: This is the class for the objects that saved the internal states of origin objects (or part of this state), such as the introduction of the fact that the saving of a state can be made independent of the object itself. The memento has two interfaces:

    • A complete interface for Originator objects that permit access to everything that needs to be saved or restored

    • A narrow interface to the caretaker that can keep and pass on the memento references, but no more

  • Originator: This is the object class...

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