Thread by @Jeehut

Hope you had a great week of #WWDC23! 🎉

As a yearly tradition, I wrote a #SessionSummary tweet with my key takeaways for 23 selected sessions covered on @WWDCNotes.

Get a sense of each session & find ones that pique your interest!
And don't forget to share! 🔁

Thread 🧵🧵🧵👇

What's new in Xcode 15:
🚀 Smart code completion
🌈 Image/Color Symbols
💬 Auto-extraction of Strings
🗂️ String catalog + visual editor
⚡ Quick Actions ⇧⌘A
🔖 Bookmark line/query
✏️ Editable Git staging
🧪 Test report redesign
📝 OSLog in console

More: wwdcnotes.com/notes/wwdc23/1…

What’s new in Swift:
🔀 if/else & switch expressions -> concise code
📦 Param Packs overcome API overload limits
🛠️ Macros eliminate boilerplate
⚡ Foundation rewrite -> more performance
🔗 C++ interop, like ObjC
🎭 Actor executors for custom sync

More: wwdcnotes.com/notes/wwdc23/1…

What's new in SwiftUI:
🌌 Spacial: Model3D, RealityView, ImmersiveSpace
📲 Button/Toggle in Widgets
📅 Widget Timeline Previews
🗺️ Better MapKit
📊 Pie & Donut Charts
💰 StoreKit views
👁️‍🗨️ @observable macro
🔍 Inspectors
🎬 Advanced animations

More: wwdcnotes.com/notes/wwdc23/1…

Meet SwiftData:
📦 @model macro for class
🔑 @Attribute(.unique) for fields
🔁 @Relationship for inverses/deletion
❌ @transient to exclude
🌐 @environment(.modelContext) context
🔍 #Predicate & FetchDescriptor in code
🔎 @query(sort:order:) in view

More: wwdcnotes.com/notes/wwdc23/1…

Migrate to SwiftData:
🤝 SwiftData & Core Data can co-exist
🛠️ Core Data can create SwiftData code
💾 SwiftData has implicit save
🔀 Migrate @FetchRequest to @query
📚 Incremental adoption: 2 stacks talking to 1 store
🔄 Changes complex on this mode

More: wwdcnotes.com/notes/wwdc23/1…

Model your schema with SwiftData:
🗺️ Use @model to create schema
🔗 @Attribute(originalName:) to map across versions
🔀 @Relationship has originalName, too
📜 Define VersionedSchema enum, put models inside
📅 Order versions with SchemaMigrationPlan

More: wwdcnotes.com/notes/wwdc23/1…

Meet StoreKit for SwiftUI:
🛍️ Store/Product/Subscription views
🧩 Encapsulate logic: load/purchase/L10n…
🎨 Customizable style & background
🏁 Start/Completion, purchase task modifiers
🔘 Buttons: .redeemCode, .restorePurchase, .signIn, .policies…

More: wwdcnotes.com/notes/wwdc23/1…

Discover Observation in SwiftUI:
🔭 @observable is a macro for automating property observation
🔀 Can be overridden manually in specific cases if required
🚀 New projects should use @observable
✨ Simplifies models and views
⚡ Performance boost

More: wwdcnotes.com/notes/wwdc23/1…

Inspectors in SwiftUI: Discover the details:
🔍 New .inspector(isPresented:) modifier
ℹ️ Shows details of selected content
💁 Familiar to users from Apple apps
📐 Customize width & presented state
🔧 Flexible toolbar placement (in/out content/nav)

More: wwdcnotes.com/notes/wwdc23/1…

Explore pie charts and interactivity in Swift Charts:
🥧 SectorMark(angle:) to create pie chart
🍩 Set innerRadius for Donut chart
📝 Put text inside donut using .chartBackground
🎯 New APIs for selection (supports range) & scrolling (both axes)

More: wwdcnotes.com/notes/wwdc23/1…

Make features discoverable with TipKit:
🔖 Create a tip by conforming a type to Tip protocol
📝 Requires title & message
🖼️ Optionally asset & actions providable
☑️ Eligibility based on parameters or events
🔧 Lots of configuration & testing options

More: wwdcnotes.com/notes/wwdc23/1…

Debug with structured logging:
📊 OSLog integration
🚫 Don't use print – only for CLIs
📝 Use logger.debug|info|notice|error instead
🎨 Nice console output with colors & filterable metadata
🔍 Right-click: "Jump to Source" & "Hide Similar items"

More: wwdcnotes.com/notes/wwdc23/1…

Create rich documentation with Swift-DocC:
📚 External type extension support
👀 Live preview in Xcode
📊 @row & @column for flexible layouts
🗺️ @TabNavigator e.g. for locales/platforms
🔖 @metadata support
🎨 Theming via JSON file
⌨️ Supports ⇧⌘O

More: wwdcnotes.com/notes/wwdc23/1…

Design for spatial user interfaces:
🖼️ 3-layer App Icon
🔲 Avoid opaque window
🎨 Use darker/lighter materials
🖋️ Don't color text, color backgrounds
👀 Tap target 60x60pt, button gap 16pt, list gap 4pt
🔀 Navigation -> TabView, Actions -> Ornaments

More: wwdcnotes.com/notes/wwdc23/1…

Meet SwiftUI for spatial computing:
🔘 Buttons get hover & tooltip
🔀 TabView expands
🌌 Full Space: 3D Full Screen
🌗 No light/dark mode, glass & vibrancy
🔲 Volume: .windowStyle(.volumetric)
🎮 Model3D: 3D AsyncImage
🌍 RealityView for RealityKit

More: wwdcnotes.com/notes/wwdc23/1…

Elevate your windowed app for spatial computing:
📺 Simulator: cursor = eye tracking
📏 Content scales dynamically -> use vectors
🌈 Semantic foreground styles & fill colors
🔘 Place custom views into plain style Buttons
🔀 Use TabView (not sidebar)

More: wwdcnotes.com/notes/wwdc23/1…

Get started with privacy manifests:
🔒 3rd-party SDKs document privacy practices
📝 Privacy report helps fill labels
🌐 Add domains to manifest: system blocks until tracking allowed
📅 Privacy-impacting SDKs list in fall, devs will get email

More: wwdcnotes.com/notes/wwdc23/1…

What’s new in SF Symbols 5:
🎨 Configurable animation presets (e.g. bounce, scale)
🌈 Variable color presets (e.g. cumulative, iterative)
✏️ Custom symbols: use "erase layers" for better animation
🚗🎮 700 new symbols, majority about cars/gaming

More: wwdcnotes.com/notes/wwdc23/1…

Bring widgets to new places:
🖥️ New locations: Desktop, iPad Lock, iPhone StandBy, Watch
📏 Content margins replace safe area
🎨 Use .containerBackground for removable backgrounds
🌈 Visual changes in "vibrant rendering mode" -> react with env var

More: wwdcnotes.com/notes/wwdc23/1…

Bring widgets to life:
🎬 Animate with .animation, .transition, .contentTransition
✨ Interactive using Button/Toggle
🔗 Actions exposed to widget via AppIntents
🔄 Triggering perform() reloads widget UI
🔖 Pass properties to intent using @parameter

More: wwdcnotes.com/notes/wwdc23/1…

Discover String Catalogs:
📜 Supersedes .strings(dict) files
🔍 Strings automatically extracted, code source of truth
🔄 Use LocalizedStringResource to represent / pass around
🔢 Pluralization supported
⚙️ Back to .string(dict) on build for compat.

More: wwdcnotes.com/notes/wwdc23/1…

Meet Swift OpenAPI Generator:
📦 Package plugin generates types, client, & server code
⚙️ Config & spec via YAML
🔁 Handles requesting/parsing & more internally
🃏 Mocking built-in for easy testing / previews
🚀 Makes "Spec-Driven Development" easy

More: wwdcnotes.com/notes/wwdc23/1…

Meet Push Notifications Console:
🌐 Web-based tool
📩 Send, inspect, validate
✉️ Compose notifications with types & payload
🔍 Analyze why a notification was not received
🔑 Includes JWT token generator & validator
📱 Even a device token validator

More: wwdcnotes.com/notes/wwdc23/1…

If you found this thread useful, try out my @RemafoX_App!
A Mac app written in #SwiftUI to improve workflows in #Xcode.

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- Sort Selection
- Multi-line Code
- One-line Code
- Machine-translate via Google/Microsoft/DeepL/Yandex

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https://twitter.com/remafox_app/status/1664923538933927936?s=61&t=6YcD2vWWusLJwzwnGZ3ndA