iOS: Platform View stops responding to GestureInput

[maxifuchs]

Hello,

I use a MKMapView (Apple Maps) inside a PlatformView and it’s working fine.
But after using a SearchView (with showSearch) and dismissing it, the platformView is only responding to touch events for one more time.
After that, nothing happens if you try to move the map or zoom etc.
Every other flutter widget on screen is still working fine.

This affects both debug builds and release builds and it affects simulator (most of the time) and real devices (all the time).

I also uploaded a demo project on google drive, so you can reproduce the bug.
The bug occurs most of the time but if not, please close and restart the app and follow the steps again.

Video of bug:
Link
Demo project:
Link

Steps to Reproduce

1. Move the map (then wait until touch is finished / animation finished)
2. Press SearchButton
3. Press dismiss button (in the top left corner)
4. Move the Map (then wait until touch is finished / animation finished)
5. Try to move the map again -> Map not moving/interactive anymore
   If the map is still interactive, repeat steps 2 through 5
   If the bug still not occurs, try closing and reopening the app and follow the steps again.

Logs

[+16700 ms] [DEVICE LOG] 2019-08-03 19:13:35.431071+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124b5b, Description: send gesture actions
[  +38 ms] [DEVICE LOG] 2019-08-03 19:13:35.468868+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124b5c, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:35.469011+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124b5d, Description: send gesture actions
[  +14 ms] [DEVICE LOG] 2019-08-03 19:13:35.485203+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124b5e, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:35.485516+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124b5f, Description: send gesture actions
[  +16 ms] [DEVICE LOG] 2019-08-03 19:13:35.501697+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e00, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:35.502253+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e01, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:35.502346+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e02, Description: send gesture actions
[ +199 ms] [DEVICE LOG] 2019-08-03 19:13:35.699206+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e03, Description: send gesture actions
[   +2 ms] [DEVICE LOG] 2019-08-03 19:13:35.699953+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e04, Description: send gesture actions
[ +181 ms] [DEVICE LOG] 2019-08-03 19:13:35.884511+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e05, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:35.885436+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e06, Description: send gesture actions
[ +193 ms] [DEVICE LOG] 2019-08-03 19:13:36.078856+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e07, Description: send gesture actions
[   +2 ms] [DEVICE LOG] 2019-08-03 19:13:36.079591+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e08, Description: send gesture actions
[ +178 ms] [DEVICE LOG] 2019-08-03 19:13:36.259984+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e09, Description: send gesture actions
[   +1 ms] [DEVICE LOG] 2019-08-03 19:13:36.260367+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0a, Description: send gesture actions
[ +189 ms] [DEVICE LOG] 2019-08-03 19:13:36.450115+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0b, Description: send gesture actions
[   +1 ms] [DEVICE LOG] 2019-08-03 19:13:36.451050+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0c, Description: send gesture actions
[ +186 ms] [DEVICE LOG] 2019-08-03 19:13:36.639542+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0d, Description: send gesture actions
[   +2 ms] [DEVICE LOG] 2019-08-03 19:13:36.640424+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0e, Description: send gesture actions
[ +182 ms] [DEVICE LOG] 2019-08-03 19:13:36.822902+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e0f, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:36.823640+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e50, Description: send gesture actions
[ +183 ms] [DEVICE LOG] 2019-08-03 19:13:37.008348+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e51, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:37.009338+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e52, Description: send gesture actions
[ +184 ms] [DEVICE LOG] 2019-08-03 19:13:37.193897+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e53, Description: send gesture actions
[   +2 ms] [DEVICE LOG] 2019-08-03 19:13:37.194664+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e54, Description: send gesture actions
[ +185 ms] [DEVICE LOG] 2019-08-03 19:13:37.379020+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e55, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:37.379704+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e56, Description: send gesture actions
[ +181 ms] [DEVICE LOG] 2019-08-03 19:13:37.563925+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e57, Description: send gesture actions
[   +2 ms] [DEVICE LOG] 2019-08-03 19:13:37.564301+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e58, Description: send gesture actions
[ +357 ms] [DEVICE LOG] 2019-08-03 19:13:37.922696+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e59, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:37.922928+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e5a, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:37.923770+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e5b, Description: send gesture actions
[+2181 ms] [DEVICE LOG] 2019-08-03 19:13:40.107651+0200  localhost Runner[30814]: (AXRuntime) [com.apple.Accessibility:AXRuntimeCommon] This class 'FlutterSemanticsObject' is not a known serializable element and returning it as an
accessibility element may lead to crashes
[  +13 ms] [DEVICE LOG] 2019-08-03 19:13:40.120996+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e5c, Description: send gesture actions
[  +92 ms] [DEVICE LOG] 2019-08-03 19:13:40.210532+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124e5d, Description: send gesture actions
[  +14 ms] [DEVICE LOG] 2019-08-03 19:13:40.227109+0200  localhost Runner[30814]: (Flutter) flutter: Test
[        ] flutter: Test
[ +390 ms] [DEVICE LOG] 2019-08-03 19:13:40.618156+0200  localhost Runner[30814]: (CallKit) [com.apple.calls.callkit:Default] Call host has no calls
[   +9 ms] [DEVICE LOG] 2019-08-03 19:13:40.627397+0200  localhost Runner[30814]: (CoreFoundation) Created Activity ID: 0x124e5e, Description: Updating Key-Value Observers Of Preferences
[   +4 ms] [DEVICE LOG] 2019-08-03 19:13:40.630439+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:FeedbackActivation] activate generator with style: TurnOn; activationCount: 0 -> 1; styleActivationCount: 0 -> 1;
<_UIKeyboardFeedbackGenerator: 0x600007e00000>
[   +1 ms] [DEVICE LOG] 2019-08-03 19:13:40.630645+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] activate engine <_UIFeedbackSystemSoundEngine: 0x60000239a140>, clientCount: 0 -> 1
[   +1 ms] [DEVICE LOG] 2019-08-03 19:13:40.630729+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] activating engine <_UIFeedbackSystemSoundEngine: 0x60000239a140>
[        ] [DEVICE LOG] 2019-08-03 19:13:40.631095+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] engine <_UIFeedbackSystemSoundEngine: 0x60000239a140: state=3, numberOfClients=1, prewarmCount=0,
_internal_isSuspended=0> state changed: Inactive -> Activating
[   +1 ms] [DEVICE LOG] 2019-08-03 19:13:40.631289+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] engine <_UIFeedbackSystemSoundEngine: 0x60000239a140: state=4, numberOfClients=1, prewarmCount=0,
_internal_isSuspended=0> state changed: Activating -> Running
[        ] [DEVICE LOG] 2019-08-03 19:13:40.635018+0200  localhost Runner[30814]: (RunningBoardServices) Created Activity ID: 0x124e5f, Description: didChangeInheritances
[+1595 ms] [DEVICE LOG] 2019-08-03 19:13:42.233585+0200  localhost Runner[30814]: (AXRuntime) [com.apple.Accessibility:AXRuntimeCommon] This class 'FlutterSemanticsObject' is not a known serializable element and returning it as an
accessibility element may lead to crashes
[  +19 ms] [DEVICE LOG] 2019-08-03 19:13:42.252617+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef0, Description: send gesture actions
[  +62 ms] [DEVICE LOG] 2019-08-03 19:13:42.315455+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef1, Description: send gesture actions
[  +25 ms] [DEVICE LOG] 2019-08-03 19:13:42.336119+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:FeedbackActivation] deactivate generator with style: TurnOn; activationCount: 1 -> 0; styleActivationCount: 1 -> 0;
<_UIKeyboardFeedbackGenerator: 0x600007e00000>
[        ] [DEVICE LOG] 2019-08-03 19:13:42.336203+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] deactivate engine <_UIFeedbackSystemSoundEngine: 0x60000239a140>, clientCount: 1 -> 0
[        ] [DEVICE LOG] 2019-08-03 19:13:42.336260+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] _internal_deactivateEngineIfPossible <_UIFeedbackSystemSoundEngine: 0x60000239a140>, clientCount: 0, suspended: 0
[        ] [DEVICE LOG] 2019-08-03 19:13:42.336313+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] _internal_deactivateEngineIfPossible <_UIFeedbackSystemSoundEngine: 0x60000239a140> tearedDown: 1
[        ] [DEVICE LOG] 2019-08-03 19:13:42.336436+0200  localhost Runner[30814]: (UIKitCore) [com.apple.UIKit:Feedback] engine <_UIFeedbackSystemSoundEngine: 0x60000239a140: state=0, numberOfClients=0, prewarmCount=0,
_internal_isSuspended=0> state changed: Running -> Inactive
[+4715 ms] [DEVICE LOG] 2019-08-03 19:13:47.059008+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef2, Description: send gesture actions
[  +16 ms] [DEVICE LOG] 2019-08-03 19:13:47.075408+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef3, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:47.075785+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef4, Description: send gesture actions
[ +197 ms] [DEVICE LOG] 2019-08-03 19:13:47.269943+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef5, Description: send gesture actions
[ +190 ms] [DEVICE LOG] 2019-08-03 19:13:47.458765+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef6, Description: send gesture actions
[ +176 ms] [DEVICE LOG] 2019-08-03 19:13:47.638649+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef7, Description: send gesture actions
[ +186 ms] [DEVICE LOG] 2019-08-03 19:13:47.825529+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef8, Description: send gesture actions
[ +347 ms] [DEVICE LOG] 2019-08-03 19:13:48.171989+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124ef9, Description: send gesture actions
[        ] [DEVICE LOG] 2019-08-03 19:13:48.172199+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124efa, Description: send gesture actions
[+2893 ms] [DEVICE LOG] 2019-08-03 19:13:51.067636+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124efb, Description: send gesture actions
[ +736 ms] [DEVICE LOG] 2019-08-03 19:13:51.804476+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124efc, Description: send gesture actions
[ +722 ms] [DEVICE LOG] 2019-08-03 19:13:52.526711+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124efd, Description: send gesture actions
[ +496 ms] [DEVICE LOG] 2019-08-03 19:13:53.022698+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124efe, Description: send gesture actions
[ +460 ms] [DEVICE LOG] 2019-08-03 19:13:53.483232+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x124eff, Description: send gesture actions
[+1404 ms] [DEVICE LOG] 2019-08-03 19:13:54.887590+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125110, Description: send gesture actions
[ +367 ms] [DEVICE LOG] 2019-08-03 19:13:55.255056+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125111, Description: send gesture actions
[ +337 ms] [DEVICE LOG] 2019-08-03 19:13:55.592560+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125112, Description: send gesture actions
[ +229 ms] [DEVICE LOG] 2019-08-03 19:13:55.821816+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125113, Description: send gesture actions
[ +265 ms] [DEVICE LOG] 2019-08-03 19:13:56.087905+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125114, Description: send gesture actions
[ +214 ms] [DEVICE LOG] 2019-08-03 19:13:56.302801+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125115, Description: send gesture actions
[ +231 ms] [DEVICE LOG] 2019-08-03 19:13:56.534156+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125116, Description: send gesture actions
[ +244 ms] [DEVICE LOG] 2019-08-03 19:13:56.778616+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125117, Description: send gesture actions
[ +247 ms] [DEVICE LOG] 2019-08-03 19:13:57.025819+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125118, Description: send gesture actions
[ +201 ms] [DEVICE LOG] 2019-08-03 19:13:57.226882+0200  localhost Runner[30814]: (UIKitCore) Created Activity ID: 0x125119, Description: send gesture actions

Maximilians-iMac:testproject maximilian$ flutter analyze
Analyzing testproject...                                                
No issues found! (ran in 2.7s)

[✓] Flutter (Channel dev, v1.8.3, on Mac OS X 10.14.5 18F132, locale de-DE)
    • Flutter version 1.8.3 at /Users/maximilian/Documents/Flutter/flutter-sdk
    • Framework revision e4ebcdf6f4 (7 days ago), 2019-07-27 11:48:24 -0700
    • Engine revision 38ac5f30a7
    • Dart version 2.5.0 (build 2.5.0-dev.1.0 0ca1582afd)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.0)
    • Android SDK at /Users/maximilian/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.0
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.0)
    • Xcode at /Applications/Xcode-beta.app/Contents/Developer
    • Xcode 11.0, Build version 11M382q
    • CocoaPods version 1.6.1

[✓] Android Studio (version 3.4)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 38.1.1
    • Dart plugin version 183.6270
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-1343-b01)

[✓] VS Code (version 1.36.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.3.0

[✓] Connected device (1 available)
    • iPhone Xʀ • D41B7C5A-A833-4394-BAF7-9AD58713D067 • ios • com.apple.CoreSimulator.SimRuntime.iOS-13-0 (simulator)

• No issues found!

[andaas4]

I'm having the same problem with a stack that contains a PlatformView with MKMapView and a MaterialButton, after pressing the MaterialButton twice the MKMapView stops responding. Before pressing the MaterialButton everything works as expected.

[Stalder]

Same issue on Flutter v1.12.13+hotfix.8.
Also we had explored, that it can be not just MaterialButton or any other interactive widget. Touch to any Flutter view that is over the map leads to that behaviour. It works even with Text widget.

However, associated PlatformChannel still handle calls. So, i believe, that issue is related to gesture responding system.

Strange thing about this is that library has another behaviour. It doesn't stop responding at all, but after pressing the button over the map, it always skips next gesture on map, but continue responding on next gesture.

Links provided by author seems to be broken, so i'll provide repo to reproduce issue later

[maxifuchs]

Same issue on Flutter v1.12.13+hotfix.8.
Also we had explored, that it can be not just MaterialButton or any other interactive widget. Touch to any Flutter view that is over the map leads to that behaviour. It works even with Text widget.

However, associated PlatformChannel still handle calls. So, i believe, that issue is related to gesture responding system.

Strange thing about this is that library has another behaviour. It doesn't stop responding at all, but after pressing the button over the map, it always skips next gesture on map, but continue responding on next gesture.

Links provided by author seems to be broken, so i'll provide repo to reproduce issue later

I fixed the links

[darshankawar]

@maxiundtesa
I downloaded your demo link and compiled on latest master, but getting bunch of Xcode errors as below:

Xcode log

Launching lib/main.dart on iPhone 12 Pro Max in debug mode...
Running Xcode build...
Xcode build done.                                           56.3s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **


Xcode's output:
↳
    /Users/dhs/Downloads/testproject/ios/Runner/AppDelegate.swift:12:5: error: value of optional type 'FlutterPluginRegistrar?' must be unwrapped to refer to member 'register' of wrapped base type 'FlutterPluginRegistrar'
        registrar(forPlugin: "testapp").register(mapFactory, withId: "MapView")
        ^
    /Users/dhs/Downloads/testproject/ios/Runner/AppDelegate.swift:12:5: note: chain the optional using '?' to access member 'register' only for non-'nil' base values
        registrar(forPlugin: "testapp").register(mapFactory, withId: "MapView")
        ^
                                       ?
    /Users/dhs/Downloads/testproject/ios/Runner/AppDelegate.swift:12:5: note: force-unwrap using '!' to abort execution if the optional value contains 'nil'
        registrar(forPlugin: "testapp").register(mapFactory, withId: "MapView")
        ^
                                       !
    note: Using new build system
    note: Building targets in parallel
    note: Planning build
    note: Constructing build description
    warning: The iOS Simulator deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set to 8.0, but the range of supported deployment target versions is 9.0 to 14.3.99. (in target 'Flutter' from project 'Pods')

Could not build the application for the simulator.
Error launching application on iPhone 12 Pro Max.

Hence I am unable to verify this issue on latest versions. Can you check and fix the demo link and provide a github repo instead that we can clone and run directly to verify this issue ?

[pedromassangocode]

Without additional information, we are unfortunately not sure how to resolve this issue.
We are therefore reluctantly going to close this bug for now.
Please don't hesitate to comment on the bug if you have any more information for us; we will reopen it right away!
Thanks for your contribution.

Could everyone who still has this problem please file a new issue with the exact description of what happens, logs, and the output of flutter doctor -v.
All system setups can be slightly different, so it's always better to open new issues and reference related issues.