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Mastering iOS 12 Programming
Mastering iOS 12 Programming

Mastering iOS 12 Programming: Build professional-grade iOS applications with Swift and Xcode 10 , Third Edition

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Mastering iOS 12 Programming

A Better Layout with UICollectionView

The previous chapter showed you how to build a list of items using a table view. In this chapter, you'll learn how to display the same items using a more flexible component. This component is called UICollectionView, and it has a very similar interface to UITableView. The most significant difference is that you can define a much more flexible layout using a collection view. An example of this is the grid layout that UICollectionView provides out of the box. Of course, you are free to implement any layout you want for a collection view. This is probably the most significant advantage a collection view has to offer.

You will build on top of Hello-Contacts by refactoring the existing application to switch from a table view to a collection view. You are going to replace all table-view-related configuration code with its collection view...

Converting from a table view to a collection view

Showing a user's contacts in the form of a list is a fine idea. It's functional, looks all right, and people are used to seeing data displayed in the form of a list. However, wouldn't it be nice if there was a more interesting way to display the same contact data? For instance, using bigger images for the contact photos. And instead of showing everything in a list, maybe a grid is a nice alternative.

Exciting and compelling layouts drive user engagement. Users enjoy interacting with well-designed apps, and they certainly notice when you put in a bit of extra effort. Of course, merely implementing a grid layout won't automatically make your app great but when used well, users can certainly feel more at home with your app than they would if you just stick to a table view. Every app benefits from a different kind...

Understanding UICollectionViewFlowLayout and its delegate

When you use a standard collection view, it uses a grid layout. In this grid layout, all items are evenly spaced, and all items have the same size. You can visualize this quite easily by giving the collection view cell a background color in your Storyboard and running your app. This standard grid layout makes adding a grid to your app a breeze. However, the standard implementation of the grid layout is not quite perfect. If you look at the grid you have set up, it should look good on, for instance, an iPhone 8 but when switching to a smaller screen such as the iPhone SE, the layout looks nothing like the beautiful grid layout you saw before. Viewing the grid on a larger screen such as an iPhone 8 Plus doesn't make it any better either. The grid would be significantly improved if every cell was sized based...

UICollectionView performance

You have probably already noticed that, apart from the ability to add a custom layout, a collection view is very similar to a table view. When you look at what collection view does under the hood to maintain excellent scrolling performance, you will find even more similarities. The collection view is optimized to show as many cells on screen as quickly as it possibly can while keeping its memory footprint as small as possible. These optimizations are important for table views but they are even more important for collection views because a collection view might show a lot more cells on screen at a time than a table view does. The following diagram visualizes this:

The fact that collection views show so many cells at once has made it so that Apple added an extra optimization to it compared to table views. A table view always loads one or two items that...

Implementing user interactions for the collection view

In the previous chapter, you saw how to implement several interactions with a table view by implementing several of its delegate methods. Any time the user interacts with a cell, the table view calls a delegate method to see what exactly should happen as a response to this interaction. Collection views have incredibly similar capabilities, except for a few details. For instance, implementing reordering on a collection view requires a little bit more work than it does for a table view, as you will see shortly. Also, collection view cells cannot be swiped on to reveal actions to, for instance, delete a cell like you can with a table view cell. Similar functionality can be added to collection views though, and this section will show you exactly how.

You will learn how to implement the following interactions:

  • Cell selection
  • Cell...

Summary

This chapter has taught you how to harness the powers given to you by UICollectionView and UICollectionViewLayout in your apps. You saw that collection view come with a nice grid layout out of the box and that you can easily customize this grid layout by implementing a couple of delegate methods. Next, you created your layout to make your contacts app look more interesting and engaging. You also learned about the collection view's performance characteristics and how to implement great features such as contact selection, deletion, and reordering.

You have learned some fairly complex matter in this chapter, and you have implemented some pretty advanced features, such as your custom layout, gesture recognition, and using animations to provide feedback to users. All of these techniques are important parts of your toolbox as an iOS developer because they are applicable...

Questions

  1. UICollectionView is very similar to another component on iOS. Which component is this?

a) UIImageView 
b) UIScrollView
c) UITableView

  1. Which class did you have to subclass to create your own collection view layout?

a) UICollectionViewFlowLayout
b) UICollectionViewLayout
c) UICollectionLayout

  1. Which technique is applied by collection views to ensure great performance?

a) Fetching cells a couple of rows ahead of the user's current position
b) Fetching all cells at once
c) Fetching cells just in time

  1. Where in Interface Builder can you find the collection view's layout object?

a) The Attributes Inspector
b) The Document Outline
c) The Object Library

  1. Which feature that can be implemented for collection views is not available for table views?

a) Reordering cells
b) Deleting cells
c) Horizontal scrolling

  1. What is a gesture recognizer?

a) An...

Further reading

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Key benefits

  • Explore the extensive world of iOS development through practical examples
  • Gain detailed insights into core iOS programming concepts such as app extensions and performance
  • Extend your iOS apps by adding augmented reality and machine learning capabilities

Description

The iOS development environment has significantly matured, and with Apple users spending more money in the App Store, there are plenty of development opportunities for professional iOS developers. However, the journey to mastering iOS development and the new features of iOS 12 is not straightforward. This book will help you make that transition smoothly and easily. With the help of Swift 4.2, you’ll not only learn how to program for iOS 12, but also how to write efficient, readable, and maintainable Swift code that maintains industry best practices. Mastering iOS 12 Programming will help you build real-world applications and reflect the real-world development flow. You will also find a mix of thorough background information and practical examples, teaching you how to start implementing your newly gained knowledge. By the end of this book, you will have got to grips with building iOS applications that harness advanced techniques and make best use of the latest and greatest features available in iOS 12.

Who is this book for?

If you’re a developer with some experience in iOS programming and want to enhance your skills by unlocking the full potential of the latest iOS version with Swift to build great applications, this book is for you.

What you will learn

  • Build a professional iOS application using Xcode 10 and Swift 4.2
  • Use AutoLayout to create complex layouts that look great on every device
  • Delve into advanced animations with UIViewPropertyAnimator and UIKit Dynamics
  • Enhance your app by using instruments and building your own profiling tools
  • Integrate iMessage, Siri, and more in your app through app extensions
  • Train and use machine learning models with Core ML 2 and Create ML
  • Create engaging augmented reality experiences with ARKit 2
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Publication date : Oct 31, 2018
Length: 750 pages
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Language : English
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Product Details

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Length: 750 pages
Edition : 3rd
Language : English
ISBN-13 : 9781789133202
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Table of Contents

28 Chapters
UITableView Touch-up Chevron down icon Chevron up icon
A Better Layout with UICollectionView Chevron down icon Chevron up icon
Creating a Detail Page Chevron down icon Chevron up icon
Immersing Your Users with Animation Chevron down icon Chevron up icon
Understanding the Swift Type System Chevron down icon Chevron up icon
Writing Flexible Code with Protocols and Generics Chevron down icon Chevron up icon
Improving the Application Structure Chevron down icon Chevron up icon
Adding Core Data to Your App Chevron down icon Chevron up icon
Fetching and Displaying Data from the Network Chevron down icon Chevron up icon
Being Proactive with Background Fetch Chevron down icon Chevron up icon
Syncing Data with CloudKit Chevron down icon Chevron up icon
Using Augmented Reality Chevron down icon Chevron up icon
Improving Apps With Location Services Chevron down icon Chevron up icon
Making Smarter Apps with CoreML Chevron down icon Chevron up icon
Tracking Activity Using HealthKit Chevron down icon Chevron up icon
Streamlining Experiences with Siri Chevron down icon Chevron up icon
Using Media in Your App Chevron down icon Chevron up icon
Implementing Rich Notifications Chevron down icon Chevron up icon
Instant Information with a Today Extension Chevron down icon Chevron up icon
Exchanging Data With Drag And Drop Chevron down icon Chevron up icon
Improved Discoverability with Spotlight and Universal Links Chevron down icon Chevron up icon
Extending iMessage Chevron down icon Chevron up icon
Ensuring App Quality with Tests Chevron down icon Chevron up icon
Discovering Bottlenecks with Instruments Chevron down icon Chevron up icon
Offloading Tasks with Operations and GCD Chevron down icon Chevron up icon
Submitting Your App to the App Store Chevron down icon Chevron up icon
Answers Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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Rohan Parkes Aug 06, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is an extremely good book and one I wish I’d read earlier. It covers many topics even longer books I’ve read didn’t cover. Some topics - AR and machine learning - might be a bit obscure and not something you’d probably use, but they were still worth reading. The main strength of the book is its coding standards - it demonstrates an excellent use of Swift. It also covers topics like interface automation that other books didn’t cover. The only downside is that with the rise of IOS 13 and SwiftUI, its UIKit-based approach will soon be rendered obsolete.
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Boomer Jan 30, 2020
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Several issues with the Kindle version. You cannot download the associated files, they are need for some chapters of the book. You have to register an account on Packt and download from there, however you cannot download them unless you buy the ebook on Packt, so if you pruchas3d from Amaxzon you are screwed. If you download the files they are listed by chapter and page number, however Kindle does not list any Chapter or page numbers and since almost all the download files have the same name it is extremely time consuming to go though the dozens of chapters and find the appropriate files. I finally gave up and stopped using the book.
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