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Home > Programming > Protocol Oriented Programming > Swift 4 Protocol-Oriented Programming
Swift 4 Protocol-Oriented Programming
Swift 4 Protocol-Oriented Programming

Swift 4 Protocol-Oriented Programming: Bring predictability, performance, and productivity to your Swift applications , Third Edition

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Swift 4 Protocol-Oriented Programming

Our Type Choices

In most traditional, object-oriented programming languages, we create classes (which are reference types) as blueprints for our objects. In Swift, unlike other object-oriented languages, structures have much of the same functionality as classes; however, they are value types. Apple has said that we should prefer value types, such as structures, to reference types, but what are the actual advantages? Swift actually has a number of type choices that we can use, and in this chapter we will look at all of these types to see their advantages and disadvantages. Knowing how and when to use each type is important in order to properly implement protocol-oriented programming in our projects.

In this chapter, you will learn the following:

  • What a class is and how to use it
  • What a structure is and how to use it
  • What an enumeration is and how to use it
  • What a tuple is and...

Classes

In object-oriented programming, we cannot create an object without a blueprint that tells the application what properties and methods to expect from the object. In most object- oriented languages, this blueprint comes in the form of a class. A class is a construct that allows us to encapsulate the properties, methods, and initializers of an object into a single type. Classes can also include other items, such as subscripts; however, we are going to focus on the basic items that make up classes not only in Swift, but in other languages as well.

Let's look at how we would use a class in Swift:

class MyClass { 
  var oneProperty: String 
 
  init(oneProperty: String) { 
    self.oneProperty = oneProperty 
  } 
 
  func oneFunction() { 
 
  } 
}

An instance of a class is typically called an object. However, in Swift, structures and classes have many of the same functionalities...

Structures

Apple has said that Swift developers should prefer value types over reference types, and it seems that they have also taken that philosophy to heart. If we look at the Swift standard library (http://swiftdoc.org), we will see that the majority of types are implemented using structures. The reason Apple is able to implement the majority of Swift's standard library with structures is that, in Swift, structures have many of the same functionalities as classes. There are, however, some fundamental differences between classes and structures, and we will be looking at these differences later in this chapter.

In Swift, a structure is a construct that allows us to encapsulate the properties, methods, and initializers of an instance into a single type. They can also include other items, such as subscripts. However, we are going to focus on the basic items that make up a...

Access controls

Access controls allow us to restrict the access to, and visibility of, parts of our code. This allows us to hide implementation details and only expose the interfaces we want the external code to access. We can assign specific access levels to both classes and structures. We can also assign specific access levels to properties, methods, and initializers that belong to our classes and structures.

In Swift, there are five access levels:

  • Open: This is the most visible access control level. It allows us to use a property, method, class, and so on anywhere we want to import the module. Basically, anything can use an item that has an access control level set to open. Anything that is marked open can be subclassed or overridded by any item within the module they are defined in and any module that imports the module it is defined in. This level is primarily used by frameworks...

Enumerations

In most languages, enumerations are little more than a data type consisting of a set of named values called elements. In Swift, however, enumerations have been supercharged to give them significantly more power. Enumerations in Swift are a lot closer in functionality to classes and structures; however, they can still be used like enumerations in other languages.

Before we see how enumerations are supercharged in Swift, let's see how we can use them as standard enumerations. The following code defines an enumeration called Devices:

enum Devices 
{  
  case IPod  
  case IPhone  
  case IPad 
}

In the Devices enumeration, we defined three possible values: IPod, IPhone, and IPad. One of the reasons why enumerations are different in Swift as compared to other languages is that they can be prepopulated with values known as raw values. As shown in the following example...

Tuples

In Swift, a tuple is a finite, ordered, comma-separated list of elements. While there are tuples in other languages that I have used, I never really took advantage of them. To be honest, I was only vaguely aware that they actually existed in those other languages. In Swift, tuples are more prominent than they are in other languages, which forced me to take a closer look at them. What I found is that they are extremely useful. In my opinion, tuples are one of the most underutilized types in Swift and, as we go through this book (especially in the case study section), I will point out some cases where the tuple type can be used.

We can create a tuple and access the information within it, as shown in the following example:

let mathGrade1 = ("Jon", 100)  
let (name, score) = mathGrade1  
print("\(name) - \(score)")

In the previous code, we grouped a String...

Classes

In object-oriented programming, we cannot create an object without a blueprint that tells the application what properties and methods to expect from the object. In most object- oriented languages, this blueprint comes in the form of a class. A class is a construct that allows us to encapsulate the properties, methods, and initializers of an object into a single type. Classes can also include other items, such as subscripts; however, we are going to focus on the basic items that make up classes not only in Swift, but in other languages as well.

Let's look at how we would use a class in Swift:

class MyClass { 
  var oneProperty: String 
 
  init(oneProperty: String) { 
    self.oneProperty = oneProperty 
  } 
 
  func oneFunction() { 
 
  } 
}

An instance of a class is typically called an object. However, in Swift, structures and classes have many of the same functionalities; therefore, we will use the term instance when referring to instances of either type.

Anyone who has used object...

Structures

Apple has said that Swift developers should prefer value types over reference types, and it seems that they have also taken that philosophy to heart. If we look at the Swift standard library (http://swiftdoc.org), we will see that the majority of types are implemented using structures. The reason Apple is able to implement the majority of Swift's standard library with structures is that, in Swift, structures have many of the same functionalities as classes. There are, however, some fundamental differences between classes and structures, and we will be looking at these differences later in this chapter.

In Swift, a structure is a construct that allows us to encapsulate the properties, methods, and initializers of an instance into a single type. They can also include other items, such as subscripts. However, we are going to focus on the basic items that make up a structure. This description may sound a lot like how we described classes in the last section. This is because classes...

Access controls

Access controls allow us to restrict the access to, and visibility of, parts of our code. This allows us to hide implementation details and only expose the interfaces we want the external code to access. We can assign specific access levels to both classes and structures. We can also assign specific access levels to properties, methods, and initializers that belong to our classes and structures.

In Swift, there are five access levels:

  • Open: This is the most visible access control level. It allows us to use a property, method, class, and so on anywhere we want to import the module. Basically, anything can use an item that has an access control level set to open. Anything that is marked open can be subclassed or overridded by any item within the module they are defined in and any module that imports the module it is defined in. This level is primarily used by frameworks to expose the framework's public API.
  • Public: This access level allows us to use a property, method, class,...

Enumerations

In most languages, enumerations are little more than a data type consisting of a set of named values called elements. In Swift, however, enumerations have been supercharged to give them significantly more power. Enumerations in Swift are a lot closer in functionality to classes and structures; however, they can still be used like enumerations in other languages.

Before we see how enumerations are supercharged in Swift, let's see how we can use them as standard enumerations. The following code defines an enumeration called Devices:

enum Devices 
{  
  case IPod  
  case IPhone  
  case IPad 
}

In the Devices enumeration, we defined three possible values: IPod, IPhone, and IPad. One of the reasons why enumerations are different in Swift as compared to other languages is that they can be prepopulated with values known as raw values. As shown in the following example, we could redefine our Devices enumeration to be prepopulated with String values:

enum Devices: String {  
  case IPod...

Tuples

In Swift, a tuple is a finite, ordered, comma-separated list of elements. While there are tuples in other languages that I have used, I never really took advantage of them. To be honest, I was only vaguely aware that they actually existed in those other languages. In Swift, tuples are more prominent than they are in other languages, which forced me to take a closer look at them. What I found is that they are extremely useful. In my opinion, tuples are one of the most underutilized types in Swift and, as we go through this book (especially in the case study section), I will point out some cases where the tuple type can be used.

We can create a tuple and access the information within it, as shown in the following example:

let mathGrade1 = ("Jon", 100)  
let (name, score) = mathGrade1  
print("\(name) - \(score)")

In the previous code, we grouped a String and an Integer into a single tuple type. We then decomposed the tuple using pattern matching, which places the values into the name...

Protocols

To some, it may seem surprising that protocols are considered a type since we cannot actually create an instance of them; however, we can use them as a type. What this statement means is that, when we define the type for a variable, constant, tuple, or collection, we can use a protocol for that type.

We are not going to cover protocols in depth in this section since we have already covered them in Chapter 1,Starting with the Protocol, however, it is important to understand that they are considered a type.

Each type that we have discussed so far is either a value or a reference type; however, a protocol is neither because we are not able to create an instance of them.

It is really important to have a complete understanding of the differences between value and reference types in Swift, so let's compare the two.

Value and reference types

There are some very fundamental differences between value types (structures, enumerations, and tuples) and reference types (classes). The primary difference is how the instances of value and reference types are passed. When we pass an instance of a value type, we are actually passing a copy of the original instance. This means that the changes made to one instance are not reflected back to the others. When we pass an instance of a reference type, we are passing a reference to the original instance. This means that both references point to the same instance; therefore, a change made to one reference will reflect in the others.

The explanation in the previous paragraph is a pretty straightforward explanation; however, it is a very important concept that you must understand. In this section, we are going to examine the differences between value and reference types so that we know the advantages of each, as well as the pitfalls to avoid when using them.

Let's begin by...

Recursive data types for reference types only

A recursive data type is a type that contains other values of the same type as a property for the type. Recursive data types are used when we want to define dynamic data structures, such as lists and trees. The size of these dynamic data structures can grow or shrink depending on our runtime requirements.

Linked lists are perfect examples of a dynamic data structure that we would implement using a recursive data type. A linked list is a group of nodes that are linked together and where, in its simplest form, each node maintains a link to the next node in the list. The following diagram shows how a very basic linked list works:

Each node in the list contains some value or data, and it also contains the link to the next node in the list. If one of the nodes within the list loses the reference to the next node, the remainder of the list will be lost because each node is only aware of the next node. Some linked lists maintain a link to both the previous...

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Key benefits

  • Leverage the power of protocol-oriented programming in your applications and learn from real-world use cases
  • Create a flexible code base with protocols and protocol extensions
  • Leverage the power of generics in Swift 4 to create very flexible frameworks

Description

Swift has become the number one language used in iOS and macOS development. The Swift standard library is developed using protocol-oriented programming techniques, generics, and first-class value semantics; therefore, every Swift developer should understand these powerful concepts and how to take advantage of them in their application design. This book will help you understand the differences between object-oriented programming and protocol-oriented programming. It will demonstrate how to work with protocol-oriented programming using real-world use cases. You will gain a solid knowledge of the various types that can be used in Swift and the differences between value and reference types. You will be taught how protocol-oriented programming techniques can be used to develop very flexible and easy-to-maintain code. By the end of the book, you will have a thorough understanding of protocol-oriented programming and how to utilize it to build powerful and practical applications.

Who is this book for?

This book is for Swift developers who want to learn and implement protocol-oriented programming in their real-world applications..

What you will learn

  • Understand the differences between object-oriented programming and protocol-oriented programming
  • Explore the different types that Swift offers and what pitfalls to avoid
  • Delve into generics and generic programming
  • Learn how to implement Copy-On-Write within your custom types
  • Implement several design patterns in a protocol-oriented way
  • Design applications by prioritizing the protocol first and the implementation types second
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Oct 06, 2017
Length: 210 pages
Edition : 3rd
Language : English
ISBN-13 : 9781788470032
Vendor :
Apple
Category :
Programming
Languages :
Swift
Concepts :
Protocol Oriented Programming
Tools :
iOS

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Publication date : Oct 06, 2017
Length: 210 pages
Edition : 3rd
Language : English
ISBN-13 : 9781788470032
Vendor :
Apple
Category :
Programming
Languages :
Swift
Concepts :
Protocol Oriented Programming
Tools :
iOS

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Table of Contents

8 Chapters
Starting with the Protocol Chevron down icon Chevron up icon
Starting with the Protocol
Protocol syntax
Protocol inheritance
Protocol composition
Using protocols as a type
Polymorphism with protocols
Type casting with protocols
Associated types with protocols
Delegation
Designing with protocols
Protocols in the Swift standard library
Summary
Our Type Choices Chevron down icon Chevron up icon
Our Type Choices
Classes
Structures
Access controls
Enumerations
Tuples
Protocols
Value and reference types
Recursive data types for reference types only
Inheritance for reference types only
Dynamic dispatch
Swift's built-in types
Copy-on-write
Summary
Extensions Chevron down icon Chevron up icon
Extensions
Defining an extension
Protocol extensions
Text validation
Extensions with the Swift standard library
Conforming to the Equatable protocol
Summary
Generics Chevron down icon Chevron up icon
Generics
Generic functions
Type constraints with Generics
Generic types
Associated types
Generic subscripts
Copy-on-write
Generics in a protocol-oriented design
Generics in the Swift standard library
Summary
Object-Oriented Programming Chevron down icon Chevron up icon
Object-Oriented Programming
What is object-oriented programming?
Requirements for the sample code
Swift as an object-oriented programming language
Issues with the object-oriented design
Summary
Protocol-Oriented Programming Chevron down icon Chevron up icon
Protocol-Oriented Programming
Requirements for the sample code
Swift as a protocol-oriented programming language
Summarizing protocol-oriented programming and object-oriented programming
Differences between object-oriented programming and protocol-oriented programming
The winner is...
Summary
Adopting Design Patterns in Swift Chevron down icon Chevron up icon
Adopting Design Patterns in Swift
What are design patterns?
Creational patterns
Structural design patterns
Behavioral design patterns
Summary
Case Studies Chevron down icon Chevron up icon
Case Studies
Logging service
Data access layer
Summary

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Tim Hoar Jun 29, 2018
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In general, I’ve found packt books to be hit-or-mostly-miss, with sloppy writing, editing, and spotty content. I was fairly inclined to give this book a pass due to the negative review I saw below, but looking at the preview goaded me into purchase. Thank goodness for the preview, eh?As a background, I’m far from a beginner. Been coding for almost thirty years, and cut my teeth on the first c++ compiler. Jon’s book has been an excellent accelerator for my understanding of the differences between the strict object-oriented design and the protocol-oriented swift model. It does deal mostly with abstractions, true, but the kinds of abstractions that matter most when confronting the design of complex software. Cookbooks and code samples don’t matter that much when you’re trying to break new ground.Jon references the Gang of Four, which is key to understanding the value of his book. While his book certainly isn’t at that level of abstraction, it is in the same frame of mind: how to think about your design, rather than your code.
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About the author

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Jon Hoffman
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Jon Hoffman has over 25 years of experience in the field of information technology. Over these years, Jon has worked in the areas of system administration, network administration, network security, application development, and architecture. Currently, Jon works as a senior software engineer for Syn-Tech Systems. Jon has developed extensively for the iOS platform since 2008. This includes several apps that he has published in the App Store, apps that he has written for third parties, and numerous enterprise applications. He has also developed mobile applications for the Android and Windows platforms. What really drives Jon the challenges that the field of information technology provides and there is nothing more exhilarating to him than overcoming a challenge. Some of Jon's other interests are spending time with his family, robotic projects, and 3D printing. Jon also really enjoys Tae Kwon Do, where he and his oldest daughter Kailey earned their black belts together early in 2014, Kim (his wife) earned her black belt in December 2014, and his youngest daughter Kara is currently working towards her black belt.
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FAQs

What is the digital copy I get with my Print order? Chevron down icon Chevron up icon

When you buy any Print edition of our Books, you can redeem (for free) the eBook edition of the Print Book you’ve purchased. This gives you instant access to your book when you make an order via PDF, EPUB or our online Reader experience.

What is the delivery time and cost of print book? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela
What is custom duty/charge? Chevron down icon Chevron up icon

Customs duty are charges levied on goods when they cross international borders. It is a tax that is imposed on imported goods. These duties are charged by special authorities and bodies created by local governments and are meant to protect local industries, economies, and businesses.

Do I have to pay customs charges for the print book order? Chevron down icon Chevron up icon

The orders shipped to the countries that are listed under EU27 will not bear custom charges. They are paid by Packt as part of the order.

List of EU27 countries: www.gov.uk/eu-eea:

A custom duty or localized taxes may be applicable on the shipment and would be charged by the recipient country outside of the EU27 which should be paid by the customer and these duties are not included in the shipping charges been charged on the order.

How do I know my custom duty charges? Chevron down icon Chevron up icon

The amount of duty payable varies greatly depending on the imported goods, the country of origin and several other factors like the total invoice amount or dimensions like weight, and other such criteria applicable in your country.

For example:

  • If you live in Mexico, and the declared value of your ordered items is over $ 50, for you to receive a package, you will have to pay additional import tax of 19% which will be $ 9.50 to the courier service.
  • Whereas if you live in Turkey, and the declared value of your ordered items is over € 22, for you to receive a package, you will have to pay additional import tax of 18% which will be € 3.96 to the courier service.
How can I cancel my order? Chevron down icon Chevron up icon

Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela