Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Swift Essentials
  • Table Of Contents Toc
  • Feedback & Rating feedback
Swift Essentials

Swift Essentials

By : Alex Blewitt, Bandlem Limited
4.8 (4)
close
close
Swift Essentials

Swift Essentials

4.8 (4)
By: Alex Blewitt, Bandlem Limited

Overview of this book

Whether you are a seasoned Objective-C developer or new to the Xcode platform, Swift Essentials will provide you with all you need to know to get started with the language. Prior experience with iOS development is not necessary, but will be helpful to get the most out of the book.
Table of Contents (10 chapters)
close
close
9
Index

Displaying objects with QuickLook

The playground timeline can display objects as well as numbers and simple strings. It is possible to load and view images in a playground using classes such as UIImage (or NSImage on OS X). These are known as QuickLook supported objects, and by default include:

  • Strings (attributed and unattributed)
  • Views
  • Class and struct types (members are shown)
  • Colors

Tip

It is possible to build support for custom types in Swift, by implementing a debugQuickLookObject method that returns a graphical view of the data.

Showing colored labels

To show a colored label, a color needs to be obtained first. When building against iOS, this will be UIColor; but when building against OS X, it will be NSColor. The methods and types are largely equivalent between the two, but this chapter will focus on the iOS types.

A color can be acquired with an initializer or by using one of the predefined colors that are exposed in Swift using methods:

import UIKit // AppKit for OS X
let blue = UIColor...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY