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#swift

5 posts5 participants0 posts today
Replied to Rasmus Grouleff (he/him)
Public
Sylvia Borin

@nerdd

Answer from Perplexity:

To fix this issue, replace unsupported types with alternatives that SwiftData can handle:

For Duration: Use TimeInterval instead, as it is supported by SwiftData.

For Color.Resolved: Avoid using it directly in your models. Instead, store color-related data in a format like RGB values or another supported type.

This ensures compatibility with SwiftData's encoding requirements.

#Swift#SwiftUI#SwiftData
Public *
Rasmus Grouleff (he/him)

Heeeelp!

What does the following error mean, and how do I fix it? It happens, when I call `modelContext.save()` in a SwiftUI view.

"SwiftData/ModelCoders.swift:105: Fatal error: Composite Coder only supports Keyed Container”

Edit: Solved! It appears SwiftData does not support Duration properties in models. Changing it to a TimeInterval instead fixes it.

#Swift#SwiftUI#SwiftData
Public
Rasmus Grouleff (he/him)

Once again I have stumbled onto something I don’t understand.

In the entry point for my app I set a NavigationContext in the environment, and when I run the app and navigate between views, at some random point, it throws the error in the second image, and the debugger indicates it is on the “struct FooApp: App {“ line.

What is going on? Help!

In the subviews I am accessing the context from the env like so: “@ Environment(NavigationContext.self) var context”.

import SwiftUI @Observable final class NavigationContext { var title: String = "The title" } @main struct FooApp: App { @State private var context = NavigationContext() var body: some Scene { WindowGroup { ContentView() } .environment (context) } }
SwiftUICore/Environment+Objects.swift:34: Fatal error: No Observable object of type NavigationContext found. A View.environmentObject(_:) for NavigationContext may be missing as an ancestor of this view.
#Swift#SwiftUI#SwiftLang
Public
Natalia Panferova

It can be difficult to find a clear, concise explanation of how method dispatch works in Swift, when calls are resolved statically or dynamically, and what that means for performance.

I wrote a post summarizing my learnings, with key cases and examples: nilcoalescing.com/blog/MethodD

Nil CoalescingMethod dispatch mechanisms in Swift: static and dynamic dispatchDive into how static and dynamic dispatch work in Swift, how they affect performance, and how to control method resolution to write faster, more efficient code.
#Swift#iOSDev
Continued thread
Public
Rasmus Grouleff (he/him)

Bingo! This was what I was looking for:

mastodon.social/@__mbh__/11420

By changing the `TimingSession.duration` to a `Duration` (much better alignment of name and type as well), I can now declaratively format the duration like so:

`Text(timingSession.duration, format: .time(pattern: .hourMinuteSecond(padHourToLength: 2)))`

MastodonMichael Bech Hansen (@__mbh__@mastodon.social)@nerdd@mstdn.social good reference site, and a better way of formatting: https://fuckingformatstyle.com/duration-styles/#time-style
#Swift#SwiftUI
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