示例AVCAM-Swift Xcode v9

当我使用Xcode 9 swift 4运行应用程序时，我遇到了这个错误

架构x86_64的未定义符号：
“uu T0So22AVCapturePhotoSettingsC12AVFoundation01_uABC16SwiftNativeTypesACWP”， 引用自： __T014vision_应用程序_dev8CameravCC06didtapd4viewyyyf在CameraVC.o“uuu T012AVFoundation39_AVCapturePhotosettingsSwiftNativeTypesPae016可用Previewc11PixelFormatg0Says 6uint32 VGFG”， 引用自： __T014vision_app_dev8; cameravcc06didtapd4viewyyf在CameraVC.o ld:未找到架构x86_64的符号clang:错误：链接器 命令失败，退出代码为1（使用-v查看调用）

试着改变

let previewPixelType=settings.availablePreviewPhotoPixelFormatTypes.first

到

让previewPixelType=设置。\u可用PreviewPhotoPixelFormatTypes.first

***苹果公司意外地将一些AVFoundation API外部协议设置为私有协议，因此在访问这些协议的方法之前，有两个未登录的
\uu

资料来源：

来源：
获取相同错误的副本
 @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)
}