Computer Programming Guide: Swift and SQL: Create an APP

216 Pages·2016·0.74 MB·English

by  Swift

Swift Programming Guide Create a

Fully Functioning App in a Day

2nd Edition by Os Swift
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Contents
Introduction
Chapter 1: A Basic Comparison of Swift and Objective C
Code Comments
Declaring Constants and Variables
Variable Names and Unicode
Integer Bounds
Type Inference
String Comparison
String Upper or Lower Case
Declaring Arrays
Working with Arrays
Declaring Dictionaries
Working with Dictionaries
For Loops
Conditional Statements
Switch Statement
Functions
Chapter 2: Introduction to Playgrounds Variables vs. Constants
Explicit vs. Inferred Typing
Basic Types and Control Flow in Swift Floats and Doubles:
Bools
Strings
If Statements and String Interpolation
Part 2: Using the Xcode Editing Tools Chapter 3: Classes and Methods Chapter 4: Arrays and For
Loops Dictionaries
Chapter 5: Creating Your First iOS App Getting Started
Creating Your Model
Chapter 6: Introduction to Storyboards and Interface Builder Creating your Views
A View Controller Tour
Connecting your View Controller to your Views Connecting Actions to your View Controller
Connecting Your View Controller to your Model Chapter 7: Writing an iOS App with Swift –
Advanced What You Need
Getting Started
Learning by Example
AppDelegate.swift
MasterViewController.swift
DetailViewController.swift
Coming Up Next
Your First Feature
Setting up The Storyboard
Creating the AddTaskViewController
Cancelling Task Creation
Saving Your Task
Creating the Task struct
Managing our TaskStore
Finishing Your First Feature
How it Should Look Now
Finishing off Save
Using What You Have Got
Opening the Detail Screen
No more AnyObject
Changing the Data Source and Delegate Back to the Data Source
Finishing the Basics with the Delegate One More Method for TaskStore
Tidying Things Up a Bit
Altering the Storyboard
Updating Your MasterViewController
Redesigning the Detail View
Displaying Your Notes
Chapter 8: What’s New in Swift 2
Error Handling
Binding
Protocol Extensions
Grab Bag
Conclusion
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Introduction
In 2014, Apple changed their programming language, introducing Swift to build
on the very best features of C and Objective-C without all the constraints of C
Compatibility. Swift has been in the making for many years and brings new safe
patterns of programming to the table, along with modern features that make it
easy to program, far more flexible than ever before and a lot more fun to use.
Swift will probably look and feel very familiar to old hands at Objective-C.
That’s because it takes on the readability of named parameters and the power of
the object model within Objective –C. And it brings a lot of new features the
computer programming for iOS and OS X operating systems.
Swift is incredibly user-friendly and is perfect for new programmers to learn.
Included is support for playgrounds, which is an innovative new feature that lets
you experiment with your code, see it running and see the results before you go
to all the expense of building your app and running it.
It combines modern language with wisdom garnered from the wide culture of
Apple engineering. The compiler is fully performance optimized and the
language is development optimized without any compromises. It is designed to
go from the simple “Hello, World!” app right through to building a complete
operating system and this is what makes it the language to learn, the best
investment you could ever make for the future.
Just like everything else they produce, Apple will ensure that Swift is kept fully
updated with the latest features and the best capabilities. The idea of this book is
to give you an overview of what Swift does now and help you to create your
very first iOS/OS X app in the form of a Tips Calculator.
If you are ready to start learning the computer language of the future, head on to
the very first chapter and let’s see what you can do. Please be sure that you have
the very latest version of Xcode before you begin – you can get it from the Mac
OS X store – as we are going to delve straight into programming.
Chapter 1: A Basic Comparison of Swift and Objective C
Many of you are probably very familiar with Objective C programming
language and may be wondering what, if any, differences there are between that
and Swift. Sift is a recent and modern programming language that has all the
power for Objective C but doesn’t have all the baggage that the older language
comes with. So, before we get stuck into learning how to use Swift, I wanted to
just give you a basic comparison of the two languages. This is NOT designed to
be a “them and us” between Microsoft and Apple – there are many programmers
who use C on a daily basis and I want to show you what Swift can offer
compared to C. So, let the code start talking.
Code Comments
Both Swift and C support the same comments syntax – the all too familiar C
comment:
// code comment
/* multi line
code comment */
Declaring Constants and Variables
Like C, Swift is a very type safe language. Swift also support type inference so,
when you are declaring the variables, you do not need to specify the type as the
computer will detect, or infer, the type. It does this by evaluating the variable
assignment. C is a little more on the verbose side when it comes to declaring
constants but both C and Swift are as elegant as one anther when it comes to
using type inference to declare variables:
// Declare Constant
// C#
const int legalAge = 18;
// Swift
let legalAge = 18
// Declare Variable
// C#
var legalAge = 18;
// Swift
var legalAge = 18
Type inference is all very nice but if you do not need to assign a value to a
variable straightaway, you might have to explicitly specify the variable type:
// Type Annotation
//C#
string firstName;
// Swift