Issue 200! – September 24th 2019

An interesting article from Lina Danilchik of @splitmetrics on some of the large initial gains you can hope to see from doing some App Store Optimisation but why, after a few iterations, things will start to stabilize and you will only see minor incremental improvements. When that does happen, keep in mind these tips for your optimisation efforts.

Schedulers are a synchronisation mechanism in the Combine Framework that defines the context for when and where work is performed. In this article, @V8tr takes you through the basics, looking at the different types of scheduler available and how to use them to perform work asynchronously.

One of the great new features in UIKit this year has been the addition of UICollectionViewDiffableDataSource . In this article, Aleksej Gurin digs into the details and shows you how to use the new APIs to simplify the development and updates of your UICollectionViews.

Add a little pizazz to your push notifications with this detailed tutorial from @twannl showing you how to add rich, interactive features to your push notifications.

Now that you know how to jazz up your push notifications, make sure you also check out this in-depth article from @mattt that dives into some of the mechanics of how push notifications actually work – specifically device tokens – the unique identifier that is key to exchanging data between the server and the device (as well as some of the trouble they can cause).

With iOS 13 officially released, @simonng has published a new tutorial on using SwiftUI to build a context menu triggered from a touch-and-hold or force-touch gesture on your iOS device.

If you’ve been developing for Apple platforms for any length of time, you’ll no doubt be familiar with the traditional View Controller lifecycle events such as viewDidLoad, viewDidAppear etc. SwiftUI however, has brought a fundamentally different approach to UI development so where do these lifecycle events no fit into this brave new world? @dbolella has been taking a look.

Alignment guides are a powerful feature in SwiftUI but can be a little confusing. @SwiftUILab has put together a detailed article to explain things, covering everything from what Alignment Guides are, the difference between implicit and explicit alignments, the different types of alignment guide that are available by default as well as how to create your own custom alignments.

Nice tip from @DonnyWals on using builders within your test suite to help minimise the impact of subsequent API changes on your test code.

In this episode of Swift Unwrapped, @jesse_squires and @simjp are joined by Swift Core Team member @dgregor79 to talk about many of the new features and design decisions that have gone into the new Swift 5.1 release.

I already linked to @twostraws ‘s excellent SwiftUI by Example book and mini-site back inIssue 187 (it’s also had a recent update), but what I really wanted to link to this week was a great new set of videos that Paul has published that walks you through building your first SwiftUI app from scratch. Great resource if you’ve been waiting to get up to speed.