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bug(camera): chooseFromGallery blocks the main thread on iOS while the photo grid opens

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  • ¿Algo no está bien?
#2,603 2 comentarios 0 reacciones 0 asignados Ver en GitHub

@masimplo ya está trabajando en esto.

Desde el 24/9/2026.

  • #22 de @masimplo — abierto

Evaluación

Dificultad
4/5
Tiempo estimado
3-5 días
Aptitud para principiantes
58/100
Tipo de issue
Error
Claridad
Bastante claro
Estado de actividad
Activo
Stack tecnológico
ios, swift
Área
mobile-dev, performance

Línea de trabajo

Start with Sources/IONCameraLib/Interfaces/PhotoLibrary/IONCAMRPhotoLibraryView.swift, especially lines 82-114, and reproduce on an iOS device with a large photo library. Inspect the grid construction, scrollTo behavior, and selectedAssetArray checks while measuring main-thread work. Done means chooseFromGallery opens without a library-size-dependent freeze.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

platform: ios

Bug Report

Plugin(s)

@capacitor/camera 8.2.0 (iOS, via IONCameraLib 1.0.4). The affected code is unchanged in IONCameraLib 1.0.5 and 2.0.0.

Capacitor Version
@capacitor/core: 8.4.1
@capacitor/ios: 8.4.1
@capacitor/cli: 8.4.1
@capacitor/camera: 8.2.0
Platform(s)

iOS

Current Behavior

When Camera.chooseFromGallery() opens the photo grid, the main thread can freeze for several seconds. Our production app reported an App Hang of 2.4–3.2 s on an iPhone 15 Pro running iOS 26.6.1.

The main-thread stack is inside IONCAMRPhotoLibraryView.body, building grid cells:

swift_retain
IONCAMRPhotoLibraryView.selectedAssetArray.getter
closure in IONCAMRPhotoLibraryView.body.getter (IONCAMRPhotoLibraryView.swift:98)
Button.init
closure in IONCAMRPhotoLibraryView.body.getter (IONCAMRPhotoLibraryView.swift:86)
ZStack.init
closure in IONCAMRPhotoLibraryView.body.getter (IONCAMRPhotoLibraryView.swift:83)
closure in ForEachState.item
... (SwiftUI layout frames)
closure in IONCAMRPhotoLibraryView.body.getter (IONCAMRPhotoLibraryView.swift:114)
... 
main
Expected Behavior

The gallery opens without blocking the main thread, however many assets are in the library.

Code Reproduction

We don't have a standalone sample app yet. The call is:

await Camera.chooseFromGallery({
  mediaType: MediaTypeSelection.Photo,
  allowMultipleSelection: false,
  quality: 90,
  targetWidth: 1200,
  targetHeight: 1200,
  correctOrientation: true,
});

Steps:

  1. Use an iOS device with a large photo library (thousands of assets) and full photo access.
  2. Call Camera.chooseFromGallery() as above.
  3. The UI freezes while the grid appears. The freeze should get longer as the library grows.
Other Technical Details
  • Seen in production on iPhone 15 Pro, iOS 26.6.1 (23G83). The device's thermal state was "serious", so it was probably throttled.
Additional Context

The likely cause, from reading IONCAMRPhotoLibraryView.swift:

ForEach(photoLibraryService.results, id: \.self) { asset in ... }   // line 82: every asset in the library
...
.onAppear {
    value.scrollTo(photoLibraryService.results.startElement, anchor: .bottom)   // line 114
}
  • scrollTo on appear jumps to the far end of a LazyVGrid that holds the whole library. Our stack shows that line 114 makes SwiftUI build ForEach cells on the main thread, so the work likely grows with library size.
  • Each cell also calls selectedAssetArray.contains(asset) twice (lines 98 and 101). That's a linear search per cell, run on every body evaluation.
Lenguaje dominante
Java
Estrellas
688
Forks
692
Sin PR fusionados en 30 d

Preparar el entorno

Primeros pasos

  1. Lee el issue completo y luego la guía de contribución del proyecto.
  2. Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
  3. Haz un fork del repositorio y trabaja en una rama.
  4. Abre un pull request que haga referencia al número del issue.

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