Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Conferences
Free Learning
Arrow right icon
Hands-On Design Patterns with Swift
Hands-On Design Patterns with Swift

Hands-On Design Patterns with Swift: Master Swift best practices to build modular applications for mobile, desktop, and server platforms

Arrow left icon
Profile Icon Vilmart Profile Icon De Simone Profile Icon Giordano Scalzo
Arrow right icon
₱2500.99
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7 (3 Ratings)
Paperback Dec 2018 414 pages 1st Edition
eBook
₱1399.99 ₱2000.99
Paperback
₱2500.99
Subscription
Free Trial
Arrow left icon
Profile Icon Vilmart Profile Icon De Simone Profile Icon Giordano Scalzo
Arrow right icon
₱2500.99
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7 (3 Ratings)
Paperback Dec 2018 414 pages 1st Edition
eBook
₱1399.99 ₱2000.99
Paperback
₱2500.99
Subscription
Free Trial
eBook
₱1399.99 ₱2000.99
Paperback
₱2500.99
Subscription
Free Trial

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Table of content icon View table of contents Preview book icon Preview Book

Hands-On Design Patterns with Swift

Understanding ARC and Memory Management

Swift has a very particular and almost unique memory management strategy: Automatic Reference Counting (ARC). When using ARC, the compiler will inject memory management code for us, but it's very easy to write poor, leaky code, either on purpose or by accident. In this chapter, we'll cover all of the basics for good memory management in Swift. From its origins in Objective-C, to the pre-ARC era, to today, we'll look at how to properly manage our memory and object life cycles. We'll also explore the powerful tools available with Xcode to track memory usage, leaks, cycles, and other defects, through the inspector and the leaks instrument.

In this chapter, we'll cover the following topics:

  • A brief history of reference counting
  • What is ARC?
  • Debugging memory
  • Leaks, cycles, and dangling references
...

A brief history of reference counting

Before we get into the details of ARC, we need to rewind the time machine to a previous epoch. The year is 1988, and Objective-C is licensed by NeXT and starting to make its way into their operating system. In 1996, Apple acquires NeXT, alongside the release of OS X, a new and modern toolchain based on Objective-C. Objective-C is a strict superset of C, which means that any valid C code is valid Objective-C code, but unlike C, Objective-C has a modern and efficient memory management engine, based on reference counting.

Reference counting is a technique that accounts for the exact number of references to a particular object that exist at any given time in the memory. Once there are no references, an object, it is deallocated. This is a very different memory management technique, as compared to garbage collection, which you can find in Java...

ARC – what is that?

Automatic Reference Counting was introduced at the 2011 WWDC, in Session 323. If you want to see the original presentation, feel free to visit https://developer.apple.com/videos/play/wwdc2011/323/

ARC is made possible by Clang and LLVM. LLVM and Clang are two technologies that enable compiling C, C++, and Objective-C code. LLVM is also used alongside the Swift compiler. With ARC, a Clang feature, developers don't have to write the tedious retain and release calls. There are multiple benefits to letting the compiler handle it, as follows:

  • Memory management is difficult
  • The compiler is often more correct than you are
  • There are fewer lines of code to write
  • It has the same performance as manual reference counting

With Swift being a modern language and the successor of Objective-C, you've never had to call retain. Swift programs...

Memory debugging

Xcode and Swift come with a powerful memory debugging infrastructure, letting you inspect the contents of existing and destroyed objects, inspect the contents and relationships between your objects, and more. In this section, we'll get you started with these powerful tools, so that later on, you'll be able to debug complicated pieces of code with ease.

Configuring your project

In order to see the memory allocation backtraces, we need to enable Malloc Stack in our Scheme. You can do so by following these steps:

  1. Open your Scheme settings with ⌘ | <, or by navigating to Product | Scheme | Edit Scheme...
  2. Navigate to the Diagnostics tab
  1. Ensure that you select the options shown in the...

Leaks, cycles, and dangling references

Let's dive into examples of the two most common issues: leaks and crashes related to memory issues. A memory leak occurs when one or many objects become unreachable from the rest of your program but still, in one way or another, form a cycle.

In the first example, we'll look at how to effectively leak memory, using Xcode's powerful memory graph hierarchy tool to track down issues.

In the second example, we'll explore how to debug and investigate crashes related to accessing properties that may have been deallocated.

Leaking with cycles

One common way to leak objects and their memory is to create strong references between different instances, and cut off any external...

Summary

In this chapter, we explored the origins of ARC, the performant memory management paradigm available in Swift. With great power comes great responsibility, so you're still required to design your memory model with ARC in mind; failing to do so will lead to memory leaks or crashes caused by dangling pointers. By now, you should be comfortable with the advantages and drawbacks of both weak and unowned references. You should also understand why weak or unowned don't apply to value types. Last but not least, you should now be comfortable with setting your project up to efficiently debug memory with the tools from Xcode.

ARC sits at the compiler level, injected into your code as it is built. In the next chapter, we'll continue to refresh the basics and stretch our muscles, as we explore Foundation and the standard library.

...
Left arrow icon Right arrow icon
Download code icon Download Code

Key benefits

  • Write clean, reusable and maintainable code, and make the most of the latest Swift version.
  • Analyze case studies of some of the popular open source projects and give your workflow a huge boost
  • Choose patterns such as MVP, MVC, and MVVM depending on the application being built

Description

Swift keeps gaining traction not only amongst Apple developers but also as a server-side language. This book demonstrates how to apply design patterns and best practices in real-life situations, whether that's for new or already existing projects. You’ll begin with a quick refresher on Swift, the compiler, the standard library, and the foundation, followed by the Cocoa design patterns – the ones at the core of many cocoa libraries – to follow up with the creational, structural, and behavioral patterns as defined by the GoF. You'll get acquainted with application architecture, as well as the most popular architectural design patterns, such as MVC and MVVM, and learn to use them in the context of Swift. In addition, you’ll walk through dependency injection and functional reactive programming. Special emphasis will be given to techniques to handle concurrency, including callbacks, futures and promises, and reactive programming. These techniques will help you adopt a test-driven approach to your workflow in order to use Swift Package Manager and integrate the framework into the original code base, along with Unit and UI testing. By the end of the book, you'll be able to build applications that are scalable, faster, and easier to maintain.

Who is this book for?

This book is for intermediate developers who want to apply design patterns with Swift to structure and scale their applications. You are expected to have basic knowledge of iOS and Swift.

What you will learn

  • Work efficiently with Foundation and Swift Standard library
  • Understand the most critical GoF patterns and use them efficiently
  • Use Swift 4.2 and its unique capabilities (and limitations) to implement and improve GoF patterns
  • Improve your application architecture and optimize for maintainability and performance
  • Write efficient and clean concurrent programs using futures and promises, or reactive programming techniques
  • Use Swift Package Manager to refactor your program into reusable components
  • Leverage testing and other techniques for writing robust code
Estimated delivery fee Deliver to Philippines

Standard delivery 10 - 13 business days

₱492.95

Premium delivery 5 - 8 business days

₱2548.95
(Includes tracking information)

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 24, 2018
Length: 414 pages
Edition : 1st
Language : English
ISBN-13 : 9781789135565
Vendor :
Apple
Category :
Languages :
Tools :

What do you get with Print?

Product feature icon Instant access to your digital eBook copy whilst your Print order is Shipped
Product feature icon Paperback book shipped to your preferred address
Product feature icon Download this book in EPUB and PDF formats
Product feature icon Access this title in our online reader with advanced features
Product feature icon DRM FREE - Read whenever, wherever and however you want
OR
Modal Close icon
Payment Processing...
tick Completed

Shipping Address

Billing Address

Shipping Methods
Estimated delivery fee Deliver to Philippines

Standard delivery 10 - 13 business days

₱492.95

Premium delivery 5 - 8 business days

₱2548.95
(Includes tracking information)

Product Details

Publication date : Dec 24, 2018
Length: 414 pages
Edition : 1st
Language : English
ISBN-13 : 9781789135565
Vendor :
Apple
Category :
Languages :
Tools :

Packt Subscriptions

See our plans and pricing
Modal Close icon
$19.99 billed monthly
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Simple pricing, no contract
$199.99 billed annually
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just ₱260 each
Feature tick icon Exclusive print discounts
$279.99 billed in 18 months
Feature tick icon Unlimited access to Packt's library of 7,000+ practical books and videos
Feature tick icon Constantly refreshed with 50+ new titles a month
Feature tick icon Exclusive Early access to books as they're written
Feature tick icon Solve problems while you work with advanced search and reference features
Feature tick icon Offline reading on the mobile app
Feature tick icon Choose a DRM-free eBook or Video every month to keep
Feature tick icon PLUS own as many other DRM-free eBooks or Videos as you like for just ₱260 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total 6,174.97
Hands-On Design Patterns with Swift
₱2500.99
Mastering Swift 5
₱1989.99
Swift Protocol-Oriented Programming
₱1683.99
Total 6,174.97 Stars icon

Table of Contents

16 Chapters
Refreshing the Basics Chevron down icon Chevron up icon
Understanding ARC and Memory Management Chevron down icon Chevron up icon
Diving into Foundation and the Standard Library Chevron down icon Chevron up icon
Working with Objective-C in a Mixed Code Base Chevron down icon Chevron up icon
Creational Patterns Chevron down icon Chevron up icon
Structural Patterns Chevron down icon Chevron up icon
Behavioral Patterns Chevron down icon Chevron up icon
Swift-Oriented Patterns Chevron down icon Chevron up icon
Using the Model-View-Controller Pattern Chevron down icon Chevron up icon
Model-View-ViewModel in Swift Chevron down icon Chevron up icon
Implementing Dependency Injection Chevron down icon Chevron up icon
Futures, Promises, and Reactive Programming Chevron down icon Chevron up icon
Modularize Your Apps with Swift Package Manager Chevron down icon Chevron up icon
Testing Your Code with Unit and UI Tests Chevron down icon Chevron up icon
Going Out in the Open (Source) Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.7
(3 Ratings)
5 star 66.7%
4 star 33.3%
3 star 0%
2 star 0%
1 star 0%
Pijush Debbarma Feb 20, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Quality of page is very good. Contents also good for beginner to professional privilege. The writter did a great job for it's reader. 5 starts 👍👍👍👍
Amazon Verified review Amazon
:D Jul 14, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
So far so good...5 stars for Chapter 1 & 2
Amazon Verified review Amazon
Hamza Butt Dec 28, 2020
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
My book arrived slightly scuffed at the time, having been brought brand new this was not expected and obviously very disappointing from Amazon.That being said, the book is fantastic and expects a reasonable baseline of knowledge; then moves at a quick pace, introducing concepts all integral to native iOS development.
Amazon Verified review Amazon
Get free access to Packt library with over 7500+ books and video courses for 7 days!
Start Free Trial

FAQs

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