By Paris Buttfield-Addison, Jonathon Manning, Tim Nugent

Get hands-on event with Apple s speedy programming language by means of development genuine operating apps. With this sensible consultant, expert programmers with very little wisdom of Apple improvement will how one can code with speedy 2 through constructing 3 whole, tightly associated models of the Notes software for the OS X, iOS, and watchOS platforms.

In the method, you ll research rapid s basics, together with its syntax and lines, in addition to the fundamentals of the Cocoa, CocoaTouch, and WatchKit frameworks. This ebook teaches you the way to take advantage of universal layout styles for fast, how you can constitution an program for Apple s structures, and the way to put up operating apps to the App Store.

Divided into 4 particular components, this e-book contains: rapid 2 fundamentals: examine speedy s beneficial properties for object-oriented improvement, in addition to quite a few developer toolsOS X app improvement: organize your app, paintings with its files, and construct out its featuresiOS app improvement: Use multimedia, contacts, situation, notifications, and iCloud records to construct a completely featured iOS Notes appAdvanced app extensions: help Apple Watch and how one can debug, video display, and attempt all 3 of your rapid apps"

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Extra resources for Learning Swift: Building Apps for OS X and IOS

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Int { var total = 0 for number in numbers { total += number } return total } 28 | Chapter 2: The Basics of Swift let sum = sumNumbers(2,3,4,5) print(sum) This code snippet does the following things: First, a function called sumNumbers is defined. This function takes one or more Int values, which are integers (whole numbers), and returns a single Int. The Int... denotes that the function takes a variable number of Int values; you can access these values through the numbers variable, which is an array.

An if-let statement looks like this: var conditionalString : String? = "a string" if let theString = conditionalString { print("The string is '\(theString)'") } else { print("The string is nil") } // Prints "The string is 'a string'" Type Casting Swift is strongly typed. This means that it relies upon objects being of the type it expects when passing arguments to functions. Sometimes you need to check the type of an instance, or treat it as a different type, and that’s where type casting comes in.

You can learn more about this in Apple’s Markup Formatting Reference. 32 | Chapter 2: The Basics of Swift Control Flow In every program you write, you’ll want control over what code gets executed and when. For this, we’ll make use of if statements, loops, and so on. The syntax for con‐ trol flow in Swift is very straightforward, and includes some handy additional fea‐ tures as well. if statements in Swift are pretty much the same as in any other language, though in Swift there’s no need to wrap the expression you’re checking in parentheses: if 1+1 == 2 { print("The math checks out") } // Prints "The math checks out", which is a relief.

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