Issue #67

Hi there, welcome to the 67th issue of iOS Code Review! I hope the spring is treating you well ☀️ Let's learn something new!

Handling family shared in-app subscriptions

Apple's sample code for managing in-app purchases has a line of code that is seemingly innocent, but in fact makes the example not support Family Sharing for in-app subscriptions:

subscriptionGroupStatus = try? await subscriptions.first?.subscription?.status.first?.state

Here status is an array and any the elements can be in a subscribed status:
" ... With Family Sharing, the people who are using the subscription act independently: one may subscribe for a year and then cancel. Then another could subscribe at a later date for only a month. You have to check all of the subscriptions, not just the first one. ... "

App Store Subscriptions and Family Sharing • furbo.org

A toot by my friend Casey brought back some frustrating memories about expired subscriptions that haven’t expired (yes, really). This blog post will hopefully help you avoid having these same recollections. It all begins when a customer contacts you with a screenshot that looks something like this: Your code and the App Store don’t agree […]

Furbo.org by Craig Hockenberry

Date decoding strategies in Swift, with examples

We don't usually use the default .deferredToDate decodingStrategy of the JSONDecoder/JSONEncoder, and here's a nice article walking through the different options and when you want to use them:

Date decoding strategies in Swift [with Examples]

The JSONDecoder class uses several decoding strategies to decode dates encoded using different formats in JSON data.

Matteo ManferdiniMatteo Manferdini

Trigger value pattern in SwiftUI

" The recent version of the SwiftUI framework introduces a trigger value pattern across its APIs. Trigger value allows us to attach a view modifier that runs its action whenever the trigger value changes. You can find this pattern while using sensory feedback or launching keyframe animation in SwiftUI. This week, we will learn how to build custom view modifiers using trigger value pattern. "

Here's an example of a SwiftUI API using this pattern:

struct TriggerValueExample: View {
    let messages: [String]
    
    var body: some View {
        List(messages, id: \.self) { message in
            Text(verbatim: message)
        }
        .sensoryFeedback(.impact, trigger: messages)
    }
}

Trigger value pattern in SwiftUI

The recent version of the SwiftUI framework introduces a trigger value pattern across its APIs. Trigger value allows us to attach a view modifier that runs its action whenever the trigger value changes. You can find this pattern while using sensory feedback or launching keyframe animation in SwiftUI. This week, we will learn how to build custom view modifiers using trigger value pattern.

Swift with MajidMajid Jabrayilov

WWDC'23 videos are now on YouTube

All videos from WWDC'23 are now available on YouTube, nicely grouped into themed playlists 🎉

Apple Developer

Hello and welcome to the official Apple Developer YouTube channel.

YouTube

WWDC'24 Special Event application

Tonight is the deadline for requesting to participate in the in-person event at this year's WWDC. If that's your type of thing, you can apply here:

WWDC24 Apple Park Special Event

We’re hosting a special all-day experience at Apple Park on June 10 to kick off WWDC24.

Apple Developer

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Alright, that's it for today! Let's spread the good code vibes ✨🧘🌈☀️
I'm curious if you found any of the tips particularly interesting - let me know by replying to this email!

Thank you to Swift Craft conference for sponsoring this issue ❤️