iOS AVCaptureVideoPreviewLayer 在 UIView 中没有显示？
iOS AVCaptureVideoPreviewLayer 在 UIView 中没有显示？[英]iOS
AVCaptureVideoPreviewLayer not showing in UIView? The Problem I have a sample
application from Apple (SquareCam) that I’m using as reference to create a custom
interface for a camera. I’m using the AVFoundation framework. If I build and run theview ui框架
project from Apple, the app runs as expected. However, if I take the same code from that
project and place it in a new project in Xcode, the video preview will not display.
 我有一个来自 Apple(SquareCam)的示例应用程序,我正在使用它作为参考来为相机
创建自定义界面。我正在使用 AVFoundation 框架。如果我从 Apple 构建并运行该项
目,该应用程序将按预期运行。但是,如果我从该项目中获取相同的代码并将其放在
Xcode 中的新项目中,则不会显示视频预览。
  I have simplified the code down to the essential components to run a video preview
layer. Again, this code runs fine as is in the Apple (SquareCam) project, but does not

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