Swift For Dummies

Swift For Dummies

Jesse Feiler

Language: English

Pages: 384

ISBN: 1119022223

Format: PDF / Kindle (mobi) / ePub


Get up and running with Swift—swiftly

Brimming with expert advice and easy-to-follow instructions, Swift For Dummies shows new and existing programmers how to quickly port existing Objective-C applications into Swift and get into the swing of the new language like a pro. Designed from the ground up to be a simpler programming language, it's never been easier to get started creating apps for the iPhone or iPad, or applications for Mac OS X.

Inside the book, you'll find out how to set up Xcode for a new Swift application, use operators, objects, and data types, and control program flow with conditional statements. You'll also get the scoop on creating new functions, statements, and declarations, learn useful patterns in an object-oriented environment, and take advantage of frameworks to speed your coding along. Plus, you'll find out how Swift does away with pointer variables and how to reference and dereference variables instead.

  • Set up a playground development environment for Mac, iPhone, iPad, and wearable computers
  • Move an existing Objective-C program to Swift
  • Take advantage of framework components and subcomponents
  • Create an app that uses location, mapping, and social media

Whether you're an existing Objective-C programmer looking to port your code to Swift or you've never programmed for Apple in the past, this fun and friendly guide gets you up to speed swiftly.

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timestamps in them, you create data elements with a location (latitude and longitude) in them. By doing this, instead of selecting an Event from the master detail list and seeing its details in a detail view, you can select a Location from the master detail list and show its location on the map. To prepare for this, you must change the detail view controller so that instead of text it displays a map on which you can place pins marking locations. The following steps show you how to replace the

This is another technique that Swift uses. If you divide by zero using the &/ operator, Swift returns 0, as you can see in line 1 of Figure 5-6. A simple / operator causes a division by zero error. The trade‐off in all cases of calculations that are undefined is the balance between letting the program continue even with possibly misleading calculations (0 or 1 to bypass a possible divide‐by‐zero error) or letting it take an error branch and unambiguously stop its processing.  Chapter 5:

the methods you use: ✓✓ append: The append method is used to add an element to the end of an array. The element must be the appropriate type for the array. After you use this method, the array will be one element longer than it was before. Note that the method takes a single parameter, which is enclosed in parentheses (as all method parameters are), and not enclosed in brackets (which delimit an array literal). The append method is equivalent to the += operator. myArray11.append (instance) 

are added or removed. Iterating or enumerating over an array You can access array elements by index or by iterating through the array. Swift’s iteration methods are highly optimized and quite efficient. You can iterate (or enumerate) a collection using standard C for loops, but you can also use the highly‐optimized fast enumeration method introduced in recent versions of Objective‐C. Fast enumeration is object‐oriented and imperative rather than procedural (or functional, if you prefer that

it cost to access them in an array. In those days, the cost of performing a hash (which usually involved at least one division operation, and possibly some follow‐up disambiguation operations) was a serious concern for programmers. Today, although these concerns still exist, the reality is that the “inefficiency” of accessing data in a dictionary doesn’t matter very much. If you haven’t used dictionaries or associative arrays extensively, the word dictionary may suggest a thick volume with

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