示例AVCAM – Swift Xcode v9

@objc func didTapCameraView() {
    self.cameraView.isUserInteractionEnabled = false
    self.spinner.isHidden = false
    self.spinner.startAnimating()

    let settings = AVCapturePhotoSettings()
    let previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first!
    let previewFormat = [kCVPixelBufferPixelFormatTypeKey as String: previewPixelType,kCVPixelBufferWidthKey as String: 160,kCVPixelBufferHeightKey as String: 160]

    settings.previewPhotoFormat = previewFormat

    if flashControlState == .off {
        settings.flashMode = .off
    } else {
        settings.flashMode = .on
    }
    cameraOutput.capturePhoto(with: settings,delegate: self)
}

当我使用Xcode 9 swift 4运行应用程序时,我收到此错误

Undefined symbols for architecture x86_64:
“__T0So22AVCapturePhotoSettingsC12AVFoundation01_abC16SwiftNativeTypesACWP”,
referenced from:
__T014vision_app_dev8CameraVCC06didTapD4ViewyyF in CameraVC.o “__T012AVFoundation39_AVCapturePhotoSettingsSwiftNativeTypesPAAE016availablePreviewc11PixelFormatG0Says6UInt32VGfg”,
referenced from:
__T014vision_app_dev8CameraVCC06didTapD4ViewyyF in CameraVC.o ld: symbol(s) not found for architecture x86_64 clang: error: linker
command failed with exit code 1 (use -v to see invocation)