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Mobile Dev Japan July 26, 2024
Adam Henry
Safie Inc.
Development Division 2 > Mobile Group > iOS Team
Beginners Guide to
SwiftData
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Adam Henry (@monolithic_adam)
● iOS Engineer
● Joined Safie 2024/3
○ Previously STORES, Chatwork, Buyma,
etc.
● Living in Japan since 2011
● Hobbies
○ Playing with my kids 🧒👧
○ Games 🎮
○ Tennis 🎾
○ Sake 🍶🍺
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SwiftData
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SwiftData (iOS 17.0+)
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SwiftData is a framework that allows you to write your model code
declaratively to add managed persistence and efficient model
fetching.
So, it’s CoreData but way easier.
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@Model
@Attribute
@Query
ModelContainer & ModelContext
#Predicate
The Basics
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SwiftData Macros
(@Model, @Attribute, etc.)
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@Model
A macro that defines your model’s
schema from Swift code.
SwiftData natively adapts your value
type properties to be used as
attributes.
Basic and more complex values are
able to be used as well (structs,
enums, codable types like collections)
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@Attribute
Using this you can add uniqueness
constraints to your schema
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@Relationship, @Transient are other macros you can use
to change your schema.
@Relationship - you can control the choice of inverses
and specify delete propagation rules.
@Transient - allows you to choose a property not to be
stored by SwiftData
Other Macros
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@Query
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Using the @Query property wrapper you
can easily load and filter anything stored in
your database with a single line of code.
SwiftData supports observable for your
modeled properties.
@Query
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It didn’t play nice with enums when I
built the app with SwiftData 1.0...
If anyone knows a way to get it to be
able to filter by an enum case please
talk to me after my LT!
@Query
A problem I found
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ModelContainer & ModelContext
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The ModelContainer is where you describe how
data is stored, or persisted, on a device.
ModelContext tracks and manages a models
state in memory
ModelContainer & ModelContext
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SwiftData 2.0 (WWDC 2024)
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Tracking Model Changes with SwiftData History
Creating your own custom Data Store (for example: JSONDataStore)
#Unique Macro
Preview Modifier
Compound Predicates
Add Index for commonly used KeyPaths or combination of KeyPaths (More
Efficient/Faster Querying!)
SwiftData 2.0 (WWDC 2024)
New Features!
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Preview Modifier
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All iOS 18.0+
See you in a few years...
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What’s New in SwiftData -
https://developer.apple.com/wwdc24/10137
Create a custom data store with SwiftData -
https://developer.apple.com/wwdc24/10138
Track model changes with SwiftData history -
https://developer.apple.com/wwdc24/10075
SwiftData 2.0 (WWDC 2024)
References
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I made an example App!
It is a simple budget app that uses SwiftData to
persist its data.
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For Funsies
I did a poll and 100% were
GUI users
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We are hiring!
More info : https://open.talentio.com/r/1/c/safie/pages/84134
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We are looking for Android / iOS engineers!
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セーフィーは日本中、世界中のカメラの映像をクラウド化し
自分のため、社会のために誰もが活用できる映像プラットフォームを提供します。