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I'm getting a crash when I move quickly in my app (open a sub-page then go back to landing).
App crash log from TestFlight:
Thread 0 name:
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001c87ff334 __pthread_kill + 8
1 libsystem_pthread.dylib 0x00000001e6221aa0 pthread_kill + 272 (pthread.c:1392)
2 libsystem_c.dylib 0x00000001a3b86c10 __abort + 116 (abort.c:147)
3 libsystem_c.dylib 0x00000001a3b86b9c abort + 116 (abort.c:118)
4 AttributeGraph 0x00000001c3c31a6c AG::precondition_failure(char const*, ...) + 192 (ag-util.cc:51)
5 AttributeGraph 0x00000001c3c1f4cc AG::Graph::input_value_ref_slow(AG::data::ptr<AG::Node>, AG::AttributeID, unsigned int, AGSwiftMetadata const*, bool*, long) + 828 (ag-graph.cc:0)
6 AttributeGraph 0x00000001c3c3109c AGGraphGetValue + 232 (ag-graph-impl.h:43)
7 SwiftUI 0x00000001a140bbc4 AnyViewList.Item.list.getter + 72 (<compiler-generated>:0)
8 SwiftUI 0x00000001a140b5e8 AnyViewList.updateValue() + 512 (AnyView.swift:333)
9 SwiftUI 0x00000001a0f1f0c4 partial apply for specialized implicit closure #2 in implicit closure #1 in closure #1 in closure #1 in Attribute.init<A>(_:) + 24 (<compiler-generated>:0)
10 AttributeGraph 0x00000001c3c1977c AG::Graph::UpdateStack::update() + 492 (ag-closure.h:108)
11 AttributeGraph 0x00000001c3c19bb4 AG::Graph::update_attribute(AG::data::ptr<AG::Node>, bool) + 332 (ag-graph-update.cc:563)
12 AttributeGraph 0x00000001c3c22dc4 AG::Subgraph::update(unsigned int) + 884 (ag-subgraph.cc:613)
13 SwiftUI 0x00000001a1735188 GraphHost.runTransaction() + 172 (GraphHost.swift:491)
14 SwiftUI 0x00000001a11bd184 ViewGraph.updateOutputs(at:) + 108 (ViewGraph.swift:404)
15 SwiftUI 0x00000001a1681688 closure #1 in ViewRendererHost.render(interval:updateDisplayList:) + 1508 (ViewRendererHost.swift:188)
16 SwiftUI 0x00000001a1677bdc ViewRendererHost.render(interval:updateDisplayList:) + 308 (ViewRendererHost.swift:0)
17 SwiftUI 0x00000001a1813920 _UIHostingView.layoutSubviews() + 200 (UIHostingView.swift:1557)
18 SwiftUI 0x00000001a1813954 @objc _UIHostingView.layoutSubviews() + 28 (<compiler-generated>:0)
19 UIKitCore 0x000000019d728c20 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 2576 (UIView.m:17543)
20 QuartzCore 0x000000019dbaf91c -[CALayer layoutSublayers] + 308 (CALayer.mm:10147)
21 QuartzCore 0x000000019dbafe00 CA::Layer::layout_if_needed(CA::Transaction*) + 548 (CALayer.mm:10014)
22 QuartzCore 0x000000019dbc4a38 CA::Layer::layout_and_display_if_needed(CA::Transaction*) + 144 (CALayer.mm:2485)
23 QuartzCore 0x000000019db06ca8 CA::Context::commit_transaction(CA::Transaction*, double, double*) + 500 (CAContextInternal.mm:2510)
24 QuartzCore 0x000000019db32eb8 CA::Transaction::commit() + 684 (CATransactionInternal.mm:449)
25 QuartzCore 0x000000019db341e4 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 96 (CATransactionInternal.mm:932)
26 CoreFoundation 0x000000019a77f440 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 36 (CFRunLoop.c:1799)
27 CoreFoundation 0x000000019a779564 __CFRunLoopDoObservers + 572 (CFRunLoop.c:1912)
28 CoreFoundation 0x000000019a779b10 __CFRunLoopRun + 1052 (CFRunLoop.c:2953)
29 CoreFoundation 0x000000019a7791c0 CFRunLoopRunSpecific + 600 (CFRunLoop.c:3242)
30 GraphicsServices 0x00000001b1d61734 GSEventRunModal + 164 (GSEvent.c:2259)
31 UIKitCore 0x000000019d1e77e4 -[UIApplication _run] + 1072 (UIApplication.m:3269)
32 UIKitCore 0x000000019d1ed054 UIApplicationMain + 168 (UIApplication.m:4740)
33 SwiftUI 0x00000001a16bd350 closure #1 in KitRendererCommon(_:) + 112 (UIKitApp.swift:34)
34 SwiftUI 0x00000001a16bd2dc runApp<A>(_:) + 224 (<compiler-generated>:0)
35 SwiftUI 0x00000001a11b5b4c static App.main() + 144 (App.swift:113)
36 xxx 0x0000000102e05244 $main + 28 (<compiler-generated>:19)
37 xxx 0x0000000102e05244 main + 40 (REST_API.swift:0)
38 libdyld.dylib 0x000000019a435cf8 start + 4
The main landing UI :
import SwiftUI
struct w_landing: View {
@State var daily_feed:CAT_BITE?
@EnvironmentObject var env:Env
@State var page:pages!
public static var isAnimated:Bool = false
let timer = Timer.publish(every: 1, on: .current, in: .common).autoconnect()
@ViewBuilder
var body: some View {
NavigationView {
ZStack {
deepLink(page: $page).onChange(of: env.open_page) { (Equatable) in
DispatchQueue.main.async {
page = Equatable
}
}.id("deep_link")
Color.black
//Backgroud
Image("background_landing")
.resizable()
.aspectRatio(contentMode: .fill)
.frame(width : UIScreen.main.bounds.width,
height : UIScreen.main.bounds.height)
.ignoresSafeArea(.all)
.onAppear(){
self.parseNotification()
}
//Grid
VStack {
//DAILY FEED BUTTON
if ( self.daily_feed != nil ){
Button(action: {
page = pages.withLabel( self.daily_feed!.type)
} ){ catBite( i:0, dto : self.daily_feed!).environmentObject(env) }
}
//LIST GRID
LazyVGrid(columns: [GridItem(.flexible()),
GridItem(.flexible())]
,spacing: 8){
if Env.sharedInstance.cats.count > 0 {
ForEach(0...Env.sharedInstance.cats.count - 1 , id : \.self) {i in
if Env.sharedInstance.cats[i].type != "DAILY_FEED" {
Button(action: {
page = pages.withLabel( Env.sharedInstance.cats[i].type)
}) {
catBite( i:i - 1, dto : Env.sharedInstance.cats[i] )
.environmentObject(env)
}
}
}
}
}
Spacer()
}.padding(.top, Env.sharedInstance.hasNotch ? 80 : 50)
.padding([.leading,.trailing] , 20)
.id("the_main_list")
}.id("landing")
.navigationBarColor( .clear, textColor: .white )
.accentColor(.white)
.navigationBarTitleDisplayMode(.inline)
.onAppear(){
DispatchQueue.main.asyncAfter(deadline: .now() + 0.7) {
w_landing.isAnimated = true
}
//CheckIn
NF_APP.checkIn {
self.rebuild()
} onFail: {
}
}
.onReceive(NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification), perform: { _ in
parseNotification()
})
.onReceive(NotificationCenter.default.publisher(for: NSNotification.Name("pushRecieved")), perform: { _ in
parseNotification()
})
.onReceive(timer) { time in
env.seconds += 1
}
.navigationBarItems(leading:
Button(action : {
DispatchQueue.main.async{
self.page = .SHARE_APP
}
} ){
VStack(spacing: 0){
Image( "icon-invite")
.resizable()
.aspectRatio(contentMode: .fit)
.foregroundColor(.white)
.frame(width : 28, height : 28)
Text("Invite Friends")
.foregroundColor(.white)
.font(Font.custom("Poppins-Light", fixedSize: 8))
}
}
, trailing:
HStack(spacing : 20){
Button(action : { page = .NOTIFICATIONS} ){
Image(systemName: "bell.fill")
.resizable()
.aspectRatio(contentMode: .fit)
.foregroundColor(.white)
.frame(width : 25, height : 25)
}
Button(action : { page = .SETTINGS} ){
Image(systemName: "gearshape.fill")
.resizable()
.aspectRatio(contentMode: .fit)
.foregroundColor(.white)
.frame(width : 25, height : 25)
}
}
).toolbar {
//LOGO mid
ToolbarItem(placement: .principal) {
Image("logo-splash").resizable()
.aspectRatio(contentMode: .fit)
.frame(width : 140, height: 50)
}
}
}.navigationViewStyle(StackNavigationViewStyle())
}
fileprivate func parseNotification(){
//Open deep link notification if exsits
if push_payload != nil {
print("[PUSH] payload \(String(describing: push_payload))")
if let custom_data:[String:Any] = push_payload["custom_data"] as? [String:Any] {
push_payload = nil
let open_page:String = custom_data["open_page"] as? String ?? ""
print("[PUSH] open page = \(open_page)")
if open_page != "" {
DispatchQueue.main.asyncAfter(deadline: .now() + 0.5) {
page = pages.withLabel(open_page)
}
}
}else{
print("[PUSH] No custom data found")
}
}else{
print("[PUSH] Payload was nil")
}
}
fileprivate func rebuild(){
//Cats already loded
if Env.sharedInstance.cats.count > 0 {
return
}
if let _cats:[Any] = Env.sharedInstance.checkin?.payload!["categories"] as? [Any] {
Env.sharedInstance.cats = []
for cat in _cats {
guard let cat = cat as? [String:Any] else {
continue
}
Env.sharedInstance.cats.append(CAT_BITE(cat))
}
if Env.sharedInstance.cats.filter({ $0.type == "DAILY_FEED"}).count > 0 {
self.daily_feed = Env.sharedInstance.cats.filter({ $0.type == "DAILY_FEED"})[0]
}
}
}
}
struct w_landing_Previews: PreviewProvider {
static var previews: some View {
w_landing()
}
}
I've tried every solution in the Apple community and Stack Overflow, but I'm still stuck with this crash:
AttributeGraph precondition failure: invalid value type for attribute: 632448 (saw PreferenceKeys, expected ViewList).
and the only way to get the full log was to upload a version on TestFlight and send the report to myself once the app crashed On Xcode, the crash log is useless and I couldn't identify from where the crash is coming from.
609
It's difficult to say definitively what the issue is here, but this line:
DispatchQueue.main.async{
self.listID = UUID().uuidString //Void apple SwiftUI big in AttributeGraph cycle ( seems it worked by Jack )
}
Leads me to think you may have lurking instabilities caused by overlapping view hierarchy updates.
There's a good discussion of how arbitrarily updating your view ids can lead to issues in this week's 2021 WWDC (Demystify SwiftUI): https://developer.apple.com/wwdc21/10022
You've also got this line:
}//end of geo
.id( self.listID )
Which forces the geo view to update itself. That coupled with the above .onAppear reset of the listID is causing your entire view hierarchy to constantly update itself (and be unstable). Here's another guide about how misplaced state changes can cause unstable behavior: https://swiftui-lab.com/state-changes/
67
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