3. Using Structs and Generics | Swift Cookbook

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Table Of Contents

Swift Cookbook

By : Costa

5 (1)

Swift Cookbook

5 (1)

By: Costa

Overview of this book

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Sections

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Xcode and Swift

1. Getting Started with Xcode and Swift

Introduction

Installing Xcode from the App Store

Downloading the Xcode image

Starting a Swift project

Using Swift project options

Creating conditional code

Adding a developer account

Compiling from the command line

Using Swift as an interpreter

Adding a control version system to an existing project

2. Standard Library and Collections

2. Standard Library and Collections

Introduction

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

3. Using Structs and Generics

3. Using Structs and Generics

Introduction

Creating an exam app

Checking the right answer

Avoiding copying of structs

Creating a generic array initializer

Creating a priority list

Creating a protocol for the priority queue

4. Design Patterns with Swift

4. Design Patterns with Swift

Introduction

Writing into a log file

Creating a factory of musical notes

Simulating a home automation

Delivering some pizzas

5. Multitasking

5. Multitasking

Introduction

Working of a device while you navigate

Creating an SEO app

Being aware of cyclones

Links on our website

6. Playground

6. Playground

Introduction

Creating the first playground

Watching some graphics

Watching the temperature

Stretching an image

Beautifying your text

Receiving JSONs

Dangerous moves

7. Swift Debugging with Xcode

7. Swift Debugging with Xcode

Introduction

The Tax income simulator

The best checker movement

Debugging with LLDB

Profiling an app

8. Integrating with Objective-C

8. Integrating with Objective-C

Introduction

Calling a cab

Hiring a van

Porting from one language to another

Replacing the UI classes

Upgrading the app delegate

Creating a framework

9. Dealing with Other Languages

9. Dealing with Other Languages

Introduction

Using your old address book

Compressing a message

Using assembly code with Swift

Sharing C++ code with Swift

10. Data Access

10. Data Access

Introduction

Creating an SQLite database

Checking where your IP is from

Tracking your phone activity

Controlling your stock

Voting devices

11. Miscellaneous

11. Miscellaneous

Introduction

The geekest keyboard

Time to take your pill

Adding effects to your photos

Being a film critic

Leaving breadcrumbs

Exchanging money

Index

Index

Creating an exam app

In this recipe, we will create an exam app. For this exam, we will choose some random questions and the user will answer them. At the end, the app will show the user score and start again with a new exam.

Getting ready

First, open Xcode and create a project called Chapter 3 Examination, then create a file called question.swift. This is where we will define a question for an exam.

How to do it...

To create an exam app, follow these steps:

Open the storyboard and add a label and three buttons to the view controller. You will have something similar to the following screenshot:

Copy the following code into the question.swift file:

struct Question {
    var question:String
    var answer1:String
    var answer2:String
    var answer3:String
    var rightAnswer:Int
    var userAnswer:Int?
    
    init(question:String, answer1:String, answer2:String, answer3:String, rightAnswer:Int){
       self.question = question
        self.answer1 = answer1
        self.answer2 = answer2
  ...

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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