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)

解决方法

尝试改变
让previewPixelType = settings.availablePreviewPhotoPixelFormatTypes.first！

至

让previewPixelType = settings .__ availablePreviewPhotoPixelFormatTypes.first！

*** Apple意外地将一些AVFoundation API外部协议私有化,因此在访问它们的方法之前有2个不受欢迎的_.

资料来源：https://forums.developer.apple.com/thread/86810#259270

资料来源：Try Sample AVCAM from apple found error