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I have a VStack of views where each view contains an ArtworkView:
struct ArtworkView: View {
let artworkId: UInt64
@State private var uiImage: UIImage?
@Environment(\.scenePhase) var scenePhase
@ViewBuilder var imageView: some View {
if let uiImage = uiImage {
Image(uiImage: uiImage)
}
else {
Image(systemName: "photo").opacity(0.4)
}
}
var body: some View {
imageView
.onAppear() {
loadArtwork(withId: artworkId) {
uiImage = $0
}
}
.onChange(of: scenePhase) { scenePhase in
if scenePhase == .background {
uiImage = nil
}
}
}
}
At first sight it works as expected – images appear on launch and disappear upon transition to the background.
But when I profile with Instruments > Allocations there is no difference in memory usage between foreground and background. And I need images to be unloaded from memory in background.
Does SwiftUI VStack or Image cache underlying UIImage objects and if so, how to opt out of it?
Posted
by
okla.
Last updated
okla.
.