AVCaptureDevice.Format.supported

问题

SwiftPrivate versions of these API by prepending each API with double underscore (__). For example, change AVCaptureDevice.Format.supportedColorSpaces to AVCaptureDevice.Format.__supportedColorSpaces.

参考资料

Undefined symbols for supportedFlashModes in AVCapturePhotoOutput

• Apple 回复：AVFoundation capture APIs 用Swift3或4 在Xcode9中被不经意标注成private

• AVFoundation API 暂时不能用:

• AVCaptureDevice.Format.supportedColorSpaces

• AVCaptureDevice.supportedFlashModes

• AVCapturePhotoOutput.availablePhotoPixelFormatTypes

• AVCapturePhotoOutput.availableRawPhotoPixelFormatTypes

• AVCapturePhotoSettings.availablePreviewPhotoPixelFormatTypes

它在Xcode 12.0中使用模拟器时是有问题的，对真机设备来说，没问你题。

解决方法：

#if targetEnvironment(simulator)
let pixelFormat = photoSettings.__availablePreviewPhotoPixelFormatTypes.first!
#else
let pixelFormat = photoSettings.availablePreviewPhotoPixelFormatTypes.first!
#endif