Can't run on iOS device - can't find flutter.h

[adowdy]

First of all, great work on demonstrating GL code working in Flutter!

No expectation of support, but I was hoping you may happen to have some insight. I want to run your demo code on an iOS device! Here's my macbook environment:

flutter doctor
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v1.3.14-pre.17, on Mac OS X 10.14.3 18D109, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[✓] iOS toolchain - develop for iOS devices (Xcode 10.1)
[!] Android Studio (version 3.3)
    ✗ Flutter plugin not installed; this adds Flutter specific functionality.
    ✗ Dart plugin not installed; this adds Dart specific functionality.
[✓] VS Code (version 1.32.3)
[✓] Connected device (1 available)

Using VSCode I had no problem running on Android device, but xcode build seems to fail this way:

Launching lib/main.dart on adowdy-iPadMini4 in debug mode...
Signing iOS app for device deployment using developer identity: "iPhone Developer: [email protected] (43NXACPF3H)"
Xcode build done.                                            1.2s
Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **
Xcode's output:
↳
    In file included from /Users/dev/opengl_texture_widget_example/ios/Classes/SampleRenderWorker.m:8:
    In file included from /Users/dev/opengl_texture_widget_example/ios/Classes/SampleRenderWorker.h:8:
    /Users/dev/opengl_texture_widget_example/ios/Classes/OpenGLRender.h:8:9: fatal error: 'Flutter/Flutter.h' file not found
    #import <Flutter/Flutter.h>
            ^~~~~~~~~~~~~~~~~~~
    1 error generated.
Could not build the precompiled application for the device.
Error launching application on adowdy-iPadMini4.
Exited (sigterm)

I'm actually wondering how to debug this because I don't know how flutter is jumping into xcode. Would a workaround be to try to somehow link to flutter in the xcodeproject and provide header paths?

Cheers!

[kentcb]

Ran into this as well. The Podfile included in this repo is a bit out of date. The easiest way to get it regenerated is to delete it as well as Podfile.lock, then do flutter run. This will regenerate using the latest template.

Then I ran into another problem:

    === BUILD TARGET opengl_texture OF PROJECT Pods WITH CONFIGURATION Debug ===
    /Users/kent/Repository/opengl_texture_widget_example/ios/Classes/OpenGLRender.m:75:12: error: nullability specifier 'nonnull' conflicts with existing specifier '_Nullable'
    - (nonnull CVPixelBufferRef)copyPixelBuffer {
               ^
    1 error generated.

It seems the signature for copyPixelBuffer has changed in flutter, so I had to modify OpenGLRender.m to match:

- (CVPixelBufferRef _Nullable)copyPixelBuffer {

[doodlewind]

I can confirm as of 2020.11, this example works on Flutter 1.22.4 with following patch:

• Change the copyPixelBuffer signature as above.
• Remove Podfile and Podfile.lock (and don't checkin the new generated ones, this makes Flutter generate other boilerplate files automatically).
• Update provision file setting.
• Add following to pubspec.yaml:

environment:
  sdk: ">=2.0.0 <3.0.0"

Then flutter run should do the trick. Thanks for providing this example!

[doodlewind]

For Android build, the compileSdkVersion should be set to 28