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I'm integrating the native iOS VStarCam SDK into my Flutter project using MethodChannel. On iOS, I get multiple "Undefined symbol" linker errors when building the app for a physical device. It looks like certain native undefined symbols error.

What I'm Trying to Do

  • I'm calling native iOS functions via Flutter MethodChannel
  • The VStarCam SDK is added to my Xcode project (via .a and .h files)
  • I want to use a native function like StartVUID(...)

Error I'm Getting

When I build the iOS app, I get over 100 linker errors like:

Undefined symbol: _DeblockingFilterChromaHor_arm
Undefined symbol: _FT_Done_Glyph
Undefined symbol: _JS_CallFunction

These symbols appear related to FreeType, JavaScriptCore, and H.265 decoding.

What I tried to fix the errors

  • Added all required .a static libraries from VStarCam SDK to "Link Binary With Libraries"
  • Verified header files are imported in .mm file
  • Set “Other Linker Flags” to -ObjC and -all_load
  • Ensured the file calling native functions has .mm extension (Objective-C++)
  • Cleaned and rebuilt the project
  • Tried building on physical device and simulator

Flutter/Xcode Setup Details

Flutter version: 3.22.1 Target iOS version: 13.0+
Xcode version: 16.4
VStarCam SDK: iOS static lib (.a + .h)
Platform: iOS only

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