FB15150266: PhotosPicker label closure issue with Xcode 16.0

ContentView.swift

import PhotosUI
import SwiftUI

enum SFSymbol: String {
    case ant
}

extension Label where Title == Text, Icon == Image {
    init(_ titleKey: LocalizedStringKey, systemSymbol: SFSymbol) {
        self.init(titleKey, systemImage: systemSymbol.rawValue)
    }
}

struct ContentView: View {
    @State private var item: PhotosPickerItem?

    var body: some View {
        VStack {
            PhotosPicker(selection: $item) {
                Label("hello", systemSymbol: .ant)
            }
        }
    }
}

FB15150266.md

Basic Information

Please provide a descriptive title for your feedback:

PhotosPicker initializer label closure can't call @MainActor methods

Which platform is most relevant for your report?

iOS

Which technology does your report involve?

SwiftUI

What type of feedback are you reporting?

Incorrect/Unexpected Behavior

What build does the issue occur on?

iOS 18 Seed 8 (22A5350a)

Where does the issue occur?

In Xcode

Description

Please describe the issue and what steps we can take to reproduce it:

When using SwiftUI it's fairly common to have view initializers and modifier methods that are annotated with @MainActor, and these cannot be used from the label closure on the PhotosPicker initializer because it's marked as nonisolated.

Example, distilled from the SFSafeSymbols library which is how I actually encountered this, along with an effect modifier from Pow.

• SFSafeSymbols: https://github.com/SFSafeSymbols/SFSafeSymbols
• Pow: https://github.com/EmergeTools/Pow

import PhotosUI
import SwiftUI

enum SFSymbol: String {
    case ant
}

extension Label where Title == Text, Icon == Image {
    init(_ titleKey: LocalizedStringKey, systemSymbol: SFSymbol) {
        self.init(titleKey, systemImage: systemSymbol.rawValue)
    }
}

struct ContentView: View {
    @State private var item: PhotosPickerItem?

    var body: some View {
        VStack {
            PhotosPicker(selection: $item) {
                Label("hello", systemSymbol: .ant)
            }
        }
    }
}

Adding @preconcurrency on the imports has no effect. Should we be declaring these initializers as nonisolated? There's no explicit @MainActor here so it seems like PhotosPicker shouldn't have a @Sendable nonisolated closure for its label, though it does work with nonisolated inits on Label directly from SwiftUI.