swift - 示例 AVCAM - Swift Xcode v9

Question

 @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 运行应用程序时出现此错误

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)

Answer 1

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

到

让 previewPixelType = settings.__availablePreviewPhotoPixelFormatTypes.first!

***Apple 不小心将一些 AVFoundation API 外部协议(protocol)设为私有(private)，因此在访问它们的方法之前有 2 个下划线 _。

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

来源:Try Sample AVCAM from apple found error