Search icon CANCEL
Subscription
0
Cart icon
Your Cart (0 item)
Close icon
You have no products in your basket yet
Save more on your purchases! discount-offer-chevron-icon
Savings automatically calculated. No voucher code required.
Arrow left icon
Explore Products
Best Sellers
New Releases
Books
Videos
Audiobooks
Learning Hub
Newsletter Hub
Free Learning
Arrow right icon
timer SALE ENDS IN
0 Days
:
00 Hours
:
00 Minutes
:
00 Seconds
Swift Cookbook
Swift Cookbook

Swift Cookbook: Over 50 hands-on recipes to help you create apps, solve problems, and build your portfolio of projects in Swift

eBook
$38.99 $43.99
Paperback
$54.99
Subscription
Free Trial
Renews at $19.99p/m

What do you get with a Packt Subscription?

Free for first 7 days. $19.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing
Table of content icon View table of contents Preview book icon Preview Book

Swift Cookbook

Chapter 2. Standard Library and Collections

In this chapter, we will cover the following topics:

  • Creating HTML manually
  • Printing your object description
  • Quizzing the user
  • Searching for perfect numbers
  • Sorting an array of products
  • Finding the way out
  • Working with sets
  • Creating your own set
  • Organizing a dinner room

Introduction

It's important to know the usage of collections and standard library, mainly for those people who come from Objective-C because there are some changes here.

In this chapter, we will create some apps to use these features. After these recipes, you should have good knowledge about the Swift programming language.

As mentioned in the previous chapter, most of our recipes will be created on iOS, but you can develop them on Mac OS X if you want.

Creating HTML manually

HTML started as a simple format for displaying web pages and links. Nowadays, this format has become very common and it is used everywhere. There are even frameworks such as PhoneGap that create applications with this file type.

In this recipe, we will create HTML using only strings; the main idea is to know about string manipulation. In this case, we will create the HTML code for a visiting card.

Getting ready

Open your Xcode and create a single view project called Chapter2 HTML.

How to do it...

Let's create HTML manually by following these steps:

  1. Let's click on the storyboard and add the following layout:
    How to do it...
  2. Then, connect the text fields with the following properties on the view controller:
    @IBOutlet var nameTextField: UITextField!
    @IBOutlet var addressTextField: UITextField!
    @IBOutlet var postCodeTextField: UITextField!
    @IBOutlet var phoneTextField: UITextField!
  3. Link these properties with the corresponding text field on the view, and before creating an action button...

Printing your object description

The idea of this recipe is to see the Swift way to create a string using variable values. In Objective-C, we have a class method called stringWithFormat, but this method isn't used in Swift with the same frequency as it is used in Objective-C because now we have interpolation. In this example, we will create an app, which will show to the user three possible products. When the user chooses one of them, the app must show the information of this product and also its price if it's available.

How to do it...

  1. Create a new single view project called Chapter2 Product Value. Now, let's click on the storyboard and add three buttons, as shown here:
    How to do it...
  2. Once you've done this, you can add a new swift file called Product. Now, we will create a class with a product name, its price, and the manufacturer name.

    In this case, the only information that can be omitted is the product price; the other attributes are not optional. This means that we will need an initializer...

Quizzing the user

Sometimes, we need to add some icons on our application, but depending on the icon you want, it's not necessary to add an image; you can use Unicode characters. Let's create a quiz app using strings alone.

The idea for this app is to create an app where the user needs to answer a question in 12 seconds. After the last quiz, the app will show to the user his score, such as the number of well-answered and badly-answered questions.

Getting ready

Once we know the concept of this program, let's create a new project and name it Chapter 2 Unicode.

How to do it...

To create a quiz app, follow these steps:

  1. First, let's create a new file called Quiz and add a class with a question to it, with three possible answers and the right answer, as follows:
    class Quiz {
        var question:String
        // First possible answer
        var ①:String
        // second possible answer
        var ②:String
        // third possible answer
        var ③:String
        // Right answer
       ...

Searching for perfect numbers

Believe it or not, when computers were born as giant calculators, and until now, their main function was to do powerful calculation. Let's add a little bit of math to our Swift project to create an app that will look for the first perfect number and show it to the user.

The main question you probably have now is: what's a perfect number? A perfect number is a positive integer that is equal to the sum of its divisors. For example, 6 is a perfect number because if you sum its divisors (1 + 2 + 3), its result is 6.

In this recipe, we will learn how to use the range operators.

Getting ready

Let's start by creating a new Swift project called Chapter2 Perfect Number.

How to do it...

Follow these steps to search for perfect numbers:

  1. Click on the storyboard and create a layout similar to the one shown here:
    How to do it...
  2. Now, let's link the text fields with the following properties:
        @IBOutlet var startText: UITextField!
        @IBOutlet var endText: UITextField!
  3. Good...

Sorting an array of products

In this recipe, we will learn how to manage an array in Swift. Here, we will create an array of products (very typical), add products to it, remove unavailable products, and sort the array by price.

Getting ready

Create a new Swift single view project called Chapter 2 SortingProduct.

How to do it...

Let's create and sort an array of products by following these steps:

  1. Before we start with the view part, let's create the model part of our application. In our case, we will create the Product class. So, create a new file called Product.swift and type the following code:
    class Product: Printable {
        var name:String
        var price:Double
        var available:Bool
        
        init(name:String, price:Double, available:Bool){
            self.name = name
            self.price = price
            self.available = available
        }
        
        var description: String {
            return "\(self.name): \(self.price)£ available: \(self.available)"
        }
    }
  2. As you can see, the idea...

Introduction


It's important to know the usage of collections and standard library, mainly for those people who come from Objective-C because there are some changes here.

In this chapter, we will create some apps to use these features. After these recipes, you should have good knowledge about the Swift programming language.

As mentioned in the previous chapter, most of our recipes will be created on iOS, but you can develop them on Mac OS X if you want.

Creating HTML manually


HTML started as a simple format for displaying web pages and links. Nowadays, this format has become very common and it is used everywhere. There are even frameworks such as PhoneGap that create applications with this file type.

In this recipe, we will create HTML using only strings; the main idea is to know about string manipulation. In this case, we will create the HTML code for a visiting card.

Getting ready

Open your Xcode and create a single view project called Chapter2 HTML.

How to do it...

Let's create HTML manually by following these steps:

  1. Let's click on the storyboard and add the following layout:

  2. Then, connect the text fields with the following properties on the view controller:

    @IBOutlet var nameTextField: UITextField!
    @IBOutlet var addressTextField: UITextField!
    @IBOutlet var postCodeTextField: UITextField!
    @IBOutlet var phoneTextField: UITextField!
  3. Link these properties with the corresponding text field on the view, and before creating an action button, we will...

Printing your object description


The idea of this recipe is to see the Swift way to create a string using variable values. In Objective-C, we have a class method called stringWithFormat, but this method isn't used in Swift with the same frequency as it is used in Objective-C because now we have interpolation. In this example, we will create an app, which will show to the user three possible products. When the user chooses one of them, the app must show the information of this product and also its price if it's available.

How to do it...

  1. Create a new single view project called Chapter2 Product Value. Now, let's click on the storyboard and add three buttons, as shown here:

  2. Once you've done this, you can add a new swift file called Product. Now, we will create a class with a product name, its price, and the manufacturer name.

    In this case, the only information that can be omitted is the product price; the other attributes are not optional. This means that we will need an initializer with at least...

Quizzing the user


Sometimes, we need to add some icons on our application, but depending on the icon you want, it's not necessary to add an image; you can use Unicode characters. Let's create a quiz app using strings alone.

The idea for this app is to create an app where the user needs to answer a question in 12 seconds. After the last quiz, the app will show to the user his score, such as the number of well-answered and badly-answered questions.

Getting ready

Once we know the concept of this program, let's create a new project and name it Chapter 2 Unicode.

How to do it...

To create a quiz app, follow these steps:

  1. First, let's create a new file called Quiz and add a class with a question to it, with three possible answers and the right answer, as follows:

    class Quiz {
        var question:String
        // First possible answer
        var ①:String
        // second possible answer
        var ②:String
        // third possible answer
        var ③:String
        // Right answer
        var 👌:Int
        
        init(question:String,...
Left arrow icon Right arrow icon

Description

If you are an experienced Objective-C programmer and are looking for quick solutions to many different coding tasks in Swift, then this book is for you. You are expected to have development experience, though not necessarily with Swift.

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 30, 2015
Length: 392 pages
Edition : 1st
Language : English
ISBN-13 : 9781784391379
Vendor :
Apple
Category :
Languages :

What do you get with a Packt Subscription?

Free for first 7 days. $19.99 p/m after that. Cancel any time!
Product feature icon Unlimited ad-free access to the largest independent learning library in tech. Access this title and thousands more!
Product feature icon 50+ new titles added per month, including many first-to-market concepts and exclusive early access to books as they are being written.
Product feature icon Innovative learning tools, including AI book assistants, code context explainers, and text-to-speech.
Product feature icon Thousands of reference materials covering every tech concept you need to stay up to date.
Subscribe now
View plans & pricing

Product Details

Publication date : Apr 30, 2015
Length: 392 pages
Edition : 1st
Language : English
ISBN-13 : 9781784391379
Vendor :
Apple
Category :
Languages :

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 $5 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 $5 each
Feature tick icon Exclusive print discounts

Frequently bought together


Stars icon
Total $ 164.97
Mastering Swift
$54.99
Swift Essentials
$54.99
Swift Cookbook
$54.99
Total $ 164.97 Stars icon

Table of Contents

12 Chapters
1. Getting Started with Xcode and Swift Chevron down icon Chevron up icon
2. Standard Library and Collections Chevron down icon Chevron up icon
3. Using Structs and Generics Chevron down icon Chevron up icon
4. Design Patterns with Swift Chevron down icon Chevron up icon
5. Multitasking Chevron down icon Chevron up icon
6. Playground Chevron down icon Chevron up icon
7. Swift Debugging with Xcode Chevron down icon Chevron up icon
8. Integrating with Objective-C Chevron down icon Chevron up icon
9. Dealing with Other Languages Chevron down icon Chevron up icon
10. Data Access Chevron down icon Chevron up icon
11. Miscellaneous Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Full star icon 5
(1 Ratings)
5 star 100%
4 star 0%
3 star 0%
2 star 0%
1 star 0%
William C Turner May 26, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a book that I was waiting for. I had preordered it. When it was released I was not disappointed. Like all the books I published by Packt Publishing, it is well written, and has an excellent presentation. The subject matter is presented in an understandable manner with excellent examples and code that really works. With a new language like Swift, there is a real need for training that addresses real world examples. This is such a book. Cecil Costa knows his subject and more importantly he knows how to present it in clear examples that are complex enough to have meaning. The book is fascinating and I found I learned something with nearly every page. The book will also serve as a reference book that I know I will go back to many times for clear examples of best practices. I highly recommend this book for anyone wishing to develop apps for IOS using Swift. It is reasonably price and tremendous value for money.
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 included in a Packt subscription? Chevron down icon Chevron up icon

A subscription provides you with full access to view all Packt and licnesed content online, this includes exclusive access to Early Access titles. Depending on the tier chosen you can also earn credits and discounts to use for owning content

How can I cancel my subscription? Chevron down icon Chevron up icon

To cancel your subscription with us simply go to the account page - found in the top right of the page or at https://subscription.packtpub.com/my-account/subscription - From here you will see the ‘cancel subscription’ button in the grey box with your subscription information in.

What are credits? Chevron down icon Chevron up icon

Credits can be earned from reading 40 section of any title within the payment cycle - a month starting from the day of subscription payment. You also earn a Credit every month if you subscribe to our annual or 18 month plans. Credits can be used to buy books DRM free, the same way that you would pay for a book. Your credits can be found in the subscription homepage - subscription.packtpub.com - clicking on ‘the my’ library dropdown and selecting ‘credits’.

What happens if an Early Access Course is cancelled? Chevron down icon Chevron up icon

Projects are rarely cancelled, but sometimes it's unavoidable. If an Early Access course is cancelled or excessively delayed, you can exchange your purchase for another course. For further details, please contact us here.

Where can I send feedback about an Early Access title? Chevron down icon Chevron up icon

If you have any feedback about the product you're reading, or Early Access in general, then please fill out a contact form here and we'll make sure the feedback gets to the right team. 

Can I download the code files for Early Access titles? Chevron down icon Chevron up icon

We try to ensure that all books in Early Access have code available to use, download, and fork on GitHub. This helps us be more agile in the development of the book, and helps keep the often changing code base of new versions and new technologies as up to date as possible. Unfortunately, however, there will be rare cases when it is not possible for us to have downloadable code samples available until publication.

When we publish the book, the code files will also be available to download from the Packt website.

How accurate is the publication date? Chevron down icon Chevron up icon

The publication date is as accurate as we can be at any point in the project. Unfortunately, delays can happen. Often those delays are out of our control, such as changes to the technology code base or delays in the tech release. We do our best to give you an accurate estimate of the publication date at any given time, and as more chapters are delivered, the more accurate the delivery date will become.

How will I know when new chapters are ready? Chevron down icon Chevron up icon

We'll let you know every time there has been an update to a course that you've bought in Early Access. You'll get an email to let you know there has been a new chapter, or a change to a previous chapter. The new chapters are automatically added to your account, so you can also check back there any time you're ready and download or read them online.

I am a Packt subscriber, do I get Early Access? Chevron down icon Chevron up icon

Yes, all Early Access content is fully available through your subscription. You will need to have a paid for or active trial subscription in order to access all titles.

How is Early Access delivered? Chevron down icon Chevron up icon

Early Access is currently only available as a PDF or through our online reader. As we make changes or add new chapters, the files in your Packt account will be updated so you can download them again or view them online immediately.

How do I buy Early Access content? Chevron down icon Chevron up icon

Early Access is a way of us getting our content to you quicker, but the method of buying the Early Access course is still the same. Just find the course you want to buy, go through the check-out steps, and you’ll get a confirmation email from us with information and a link to the relevant Early Access courses.

What is Early Access? Chevron down icon Chevron up icon

Keeping up to date with the latest technology is difficult; new versions, new frameworks, new techniques. This feature gives you a head-start to our content, as it's being created. With Early Access you'll receive each chapter as it's written, and get regular updates throughout the product's development, as well as the final course as soon as it's ready.We created Early Access as a means of giving you the information you need, as soon as it's available. As we go through the process of developing a course, 99% of it can be ready but we can't publish until that last 1% falls in to place. Early Access helps to unlock the potential of our content early, to help you start your learning when you need it most. You not only get access to every chapter as it's delivered, edited, and updated, but you'll also get the finalized, DRM-free product to download in any format you want when it's published. As a member of Packt, you'll also be eligible for our exclusive offers, including a free course every day, and discounts on new and popular titles.