iOS Apprentice v6.0：Swift新手学习宝典

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iOS Apprentice v6.0 是一本由 Fahim Farook 和 Matthijs Hollemans 合著的专业教材，专为 iOS 开发新手设计，特别强调使用 Swift 语言。该书在第六版更新后，以分阶段、实践驱动的方式呈现，共包含四节课，每节都围绕一个独立的项目展开，从基础知识到进阶技巧逐步深入。本书的特色在于它将理论教学与实际开发紧密结合，每个项目旨在帮助读者掌握关键技能并提升实战经验。《iOS Apprentice》版权属于 Razeware LLC，所有内容，包括文本、图像和源代码均受严格保护，未经版权所有者事先书面许可，不得任何形式复制或分发。作者和版权持有者对软件本身及其使用不提供任何种类的保证，包括但不限于适销性、特定目的的适用性以及非侵权性。这意味着用户购买此书仅获得的是“按现状提供”，没有任何明示或默示担保。值得注意的是，书中提到的商标权，所有的商标和注册商标均属于其各自的产权所有者，这体现了尊重知识产权的原则。购买者通过购买 iOS Apprentice 获得的许可证允许他们在多个应用程序中使用和/或修改本书中的源代码，但必须遵守相应的使用条款。这本书的发布平台 Rwy 是一个付费资源，尽管价格可能较高，但对于希望系统学习 iOS 开发的新手来说，它提供了宝贵的指导和实践经验。读者在使用过程中可能会遇到各种技术挑战，但得益于书中详尽的教程和实例，可以不断提升自己的编程技能，并逐渐适应iOS 开发环境。《iOS Apprentice v6.0》是一本值得投入时间和精力的实用指南，对于初学者的成长路径具有重要意义。

Chapter 1: Introduction

Hi, welcome to The iOS Apprentice: Beginning iOS Development with Swift, Sixth Edition,

the swiftest way (pardon the pun) to iOS development mastery!

In this book you'll learn how to make your own iPhone and iPad apps using Apple’s

Swift 4.0 programming language (and Xcode 9), by building four interesting iOS apps.

The apps you’ll be making in The iOS Apprentice

Everybody likes games, right? So, you’ll start by building a simple but fun iPhone game

named Bull’s Eye. It will teach you the basics of iPhone programming, and the other

apps will build on what you learn there.

Taken together, the four apps you'll build cover everything you need to know to make

your own apps. By the end of the book you’ll be experienced enough to turn your ideas

into real apps that you can put on the App Store!

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Even if you’ve never programmed before or if you’re new to iOS, you should be able to

follow along with the step-by-step instructions and understand how these apps are

made. Each chapter has a ton of illustrations to prevent you from getting lost. Not

everything might make sense right away, but hang in there and all will become clear in

time.

Writing your own iOS apps is a lot of fun, but it’s also hard work. If you have the

imagination and perseverance, there is no limit to what you can make your apps do. It is

my sincere belief that this book can turn you from a complete newbie into an

accomplished iOS developer, but you do have to put in the time and effort. By writing

this book, I’ve done my part. The rest is up to you…

About this book

The iOS Apprentice will help you become an excellent iOS developer, but only if you let

it. Here are some tips that will help you get the most out of this book.

Learn through repetition

You’re going to make several apps in this book. Even though the apps will start out

quite simple, you may ﬁnd the instructions hard to follow at ﬁrst – especially if you’ve

never done any computer programming before – because I will be introducing a lot of

new concepts.

It’s OK if you don’t understand everything right away, as long as you get the general

idea. As you proceed through the book, you’ll go over many of these concepts again and

again until they solidify in your mind.

Follow the instructions yourself

It is important that you not just read the instructions but also actually follow them.

Open Xcode, type in the source code fragments, and run the app in the Simulator. This

helps you to see how the app gets built step by step.

Even better, play around with the code and with the Xcode settings. Feel free to modify

any part of the app and see what the results are - make a small change to the code and

see how it affects the entire app. Experiment and learn! Don’t worry about breaking

stuff – that’s half the fun. You can always ﬁnd your way back to the beginning. But

better still, you might even learn something from simply breaking the code and

learning how to ﬁx it.

iOS Apprentice Chapter 1: Introduction

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Donʼt panic – bugs happen!

You will run into problems, guaranteed. Your programs will have strange bugs that will

leave you stumped. Trust me, I’ve been programming for 30 years and that still happens

to me too. We’re only humans and our brains have a limited capacity to deal with

complex programming problems. In this book, I will give you tools for your mental

toolbox that will allow you to ﬁnd your way out of any hole you have dug for yourself.

Understanding beats copy-pasting

Too many people attempt to write iOS apps by blindly copy-pasting code that they ﬁnd

on blogs and other websites, without really knowing what that code does or how it

should ﬁt into their program.

There is nothing wrong with looking on the web for solutions – I do it all the time – but

I want to give you the tools and knowledge to understand what you’re doing and why.

That way you’ll learn quicker and write better programs.

This is hands-on practical advice, not a bunch of dry theory (although we can’t avoid

some theory). You are going to build real apps right from the start and I’ll explain how

everything works along the way, with lots of pictures that illustrate what is going on.

I will do my best to make it clear how everything ﬁts together, why we do things a

certain way, and what the alternatives are.

Do the exercises

I will also ask you to do some thinking of your own – yes, there are exercises! It’s in your

best interest to actually do these exercises. There is a big difference between knowing

the path and walking the path… And the only way to learn programming is to do it.

I encourage you to not just do the exercises but also to play with the code you’ll be

writing. Experiment, make changes, try to add new features. Software is a complex piece

of machinery and to ﬁnd out how it works you sometimes have to put some spokes in

the wheels and take the whole thing apart. That’s how you learn!

Have fun!

Last but not least, remember to have fun! Step by step you will build up your

understanding of programming while making fun apps. By the end of this book you’ll

have learned the essentials of Swift and the iOS development kit. More importantly, you

should have a pretty good idea of how everything goes together and how to think like a

programmer.

iOS Apprentice Chapter 1: Introduction

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It is my aim that by the time you reach the end of the book you will have learned

enough to stand on your own two feet as a developer. I am conﬁdent that eventually

you’ll be able to write any iOS app you want as long as you get those basics down. You

still may have a lot to learn, but when you’re through with The iOS Apprentice, you can

do without the training wheels.

Who this book is for

This book is great whether you are completely new to programming, or whether you

come from a different programming background and are looking to learn iOS

development.

If you’re a complete beginner, don’t worry – this book doesn’t assume you know

anything about programming or making apps. Of course, if you do have programming

experience, that helps. Swift is a new programming language but in many ways it’s

similar to other popular languages such as PHP, C#, or JavaScript.

If you’ve tried iOS development before with the old language, Objective-C, then its low-

level nature and strange syntax may have put you off. Well, there’s good news: now that

we have a modern language in Swift, iOS development has become a lot easier to pick

up.

It is not my aim with this book to teach you all the ins and outs of iOS development.

The iOS SDK (Software Development Kit) is huge and there is no way we can cover

everything. Fortunately, we don’t need to. You just need to master the essential

building blocks of Swift and the iOS SDK. Once you understand these fundamentals,

you can easily ﬁnd out by yourself how the other parts of the SDK work and learn the

rest on your own terms.

The most important thing I’ll be teaching you, is how to think like a programmer. That

will help you approach any programming task, whether it’s a game, a utility, a mobile

app that uses web service, or anything else you can imagine.

As a programmer you’ll often have to think your way through difﬁcult computational

problems and ﬁnd creative solutions. By methodically analyzing these problems you

will be able to solve them, no matter how complex. Once you possess this valuable skill,

you can program anything!

iOS Apprentice Chapter 1: Introduction

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iOS 11 and better only

The code in this book is aimed exclusively at iOS version 11 and later. Each new release

of iOS is such a big departure from the previous one that it just doesn’t make sense

anymore to keep developing for older devices and iOS versions. Things move fast in the

world of mobile computing!

The majority of iPhone, iPod touch, and iPad users are pretty quick to upgrade to the

latest version of iOS anyway, so you don’t need to be too worried that you’re leaving

potential users behind.

Owners of older devices, such as the iPhone 4S, iPhone 5, or the ﬁrst iPads, may be

stuck with older iOS versions but this is only a tiny portion of the market. The cost of

supporting these older iOS versions for your apps is usually greater than the handful of

extra customers it brings you.

It’s ultimately up to you to decide whether it’s worth making your app available to users

with older devices, but my recommendation is that you focus your efforts where they

matter most. Apple as a company always relentlessly looks towards the future – if you

want to play in Apple’s backyard, it’s wise to follow their lead. So back to the future it is!

What you need

It’s a lot of fun to develop for the iPhone and iPad, but like most hobbies (or

businesses!) it will cost some money. Of course, once you get good at it and build an

awesome app, you’ll have the potential to make that money back many times.

You will have to invest in the following:

iPhone, iPad, or iPod touch. I’m assuming that you have at least one of these. iOS 11

runs on the following devices: iPhone 5s or newer, iPad 5th generation or newer, iPad

mini 2 or newer, 6th generation iPod touch - basically any device which has a 64-bit

processor. With iOS 11, Apple dropped support for 32-bit processors and apps. If you

have an older device, then this is a good time to think about getting an upgrade. But

don’t worry if you don’t have a suitable device: you can do most of your testing on the

Simulator.

Note: Even though I mostly talk about the iPhone in this book, everything I say

applies equally to the iPad and iPod touch. Aside from small hardware differences,

they all use iOS and you program them in exactly the same way. You should also

iOS Apprentice Chapter 1: Introduction

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