iphone – 使用从属子项目时在Xcode中链接问题

现在奇怪的事情发生了：我可以打开库并编译它没有问题.该库链接到一些框架,例如AVFoundation.framework.

我清理目标并开始构建父项目.在我的构建结果中,我看到它构建了库,但随后链接失败并显示以下错误消息：

Undefined symbols:
  "_AVCaptureSessionPresetMedium",referenced from:
      _AVCaptureSessionPresetMedium$non_lazy_ptr in libZXingWidget.a(ZXingWidgetController.o)
     (maybe you meant: _AVCaptureSessionPresetMedium$non_lazy_ptr)
  "_CVPixelBufferGetHeight",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_CVPixelBufferLockBaseAddress",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_AudioServicesPlaySystemSound",referenced from:
      -[ZXingWidgetController presentResultForString:] in libZXingWidget.a(ZXingWidgetController.o)
  "_AudioServicesCreateSystemSoundID",referenced from:
      -[ZXingWidgetController viewWillAppear:] in libZXingWidget.a(ZXingWidgetController.o)
  "_CVPixelBufferUnlockBaseAddress",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_CVPixelBufferGetBaseAddress",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_CVPixelBufferGetBytesPerRow",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_iconv_close",referenced from:
      zxing::qrcode::DecodedBitStreamParser::append(std::basic_string<char,std::char_traits<char>,std::allocator<char> >&,unsigned char const*,unsigned long,char const*)in libZXingWidget.a(DecodedBitStreamParser-64E27B33E79CBC52.o)
      zxing::qrcode::DecodedBitStreamParser::append(std::basic_string<char,char const*)in libZXingWidget.a(DecodedBitStreamParser-64E27B33E79CBC52.o)
  "_OBJC_CLASS_$_AVCaptureVideoPreviewLayer",referenced from:
      objc-class-ref-to-AVCaptureVideoPreviewLayer in libZXingWidget.a(ZXingWidgetController.o)
  "_iconv",char const*)in libZXingWidget.a(DecodedBitStreamParser-64E27B33E79CBC52.o)
  "_OBJC_CLASS_$_AVCaptureSession",referenced from:
      objc-class-ref-to-AVCaptureSession in libZXingWidget.a(ZXingWidgetController.o)
  "_OBJC_CLASS_$_AVCaptureDevice",referenced from:
      objc-class-ref-to-AVCaptureDevice in libZXingWidget.a(ZXingWidgetController.o)
  "_kCVPixelBufferPixelFormatTypeKey",referenced from:
      _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr in libZXingWidget.a(ZXingWidgetController.o)
     (maybe you meant: _kCVPixelBufferPixelFormatTypeKey$non_lazy_ptr)
  "_OBJC_CLASS_$_AVCaptureVideoDataOutput",referenced from:
      objc-class-ref-to-AVCaptureVideoDataOutput in libZXingWidget.a(ZXingWidgetController.o)
  "_CVPixelBufferGetWidth",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_AudioServicesDisposeSystemSoundID",referenced from:
      -[ZXingWidgetController dealloc] in libZXingWidget.a(ZXingWidgetController.o)
  "_OBJC_CLASS_$_AVCaptureDeviceInput",referenced from:
      objc-class-ref-to-AVCaptureDeviceInput in libZXingWidget.a(ZXingWidgetController.o)
  "_AVLayerVideoGravityResizeAspectFill",referenced from:
      _AVLayerVideoGravityResizeAspectFill$non_lazy_ptr in libZXingWidget.a(ZXingWidgetController.o)
     (maybe you meant: _AVLayerVideoGravityResizeAspectFill$non_lazy_ptr)
  "_CMSampleBufferGetImageBuffer",referenced from:
      -[ZXingWidgetController captureOutput:didOutputSampleBuffer:fromConnection:] in libZXingWidget.a(ZXingWidgetController.o)
  "_iconv_open",char const*)in libZXingWidget.a(DecodedBitStreamParser-64E27B33E79CBC52.o)
  "_AVMediaTypeVideo",referenced from:
      _AVMediaTypeVideo$non_lazy_ptr in libZXingWidget.a(ZXingWidgetController.o)
     (maybe you meant: _AVMediaTypeVideo$non_lazy_ptr)
ld: symbol(s) not found
collect2: ld returned 1 exit status

我可以在父项目中包含所需的框架,但我认为通过在库项目中包含框架,链接就可以了.

我的问题是：我是否必须包含我的从属子项目在父项目中使用的所有框架,以确保正确链接,或者我做错了什么？

谢谢你的帮助.