目录

RichScanDemo

相机权限

奔溃问题：

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[access] This app has crashed because it attempted to access privacy-sensitive data without a usage description.  The app's Info.plist must contain an NSCameraUsageDescription key with a string value explaining to the user how the app uses this data.

info.plist 添加权限字段： NSCameraUsageDescription

layer 导致问题

错误提示：

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void UIViewReportBrokenSuperviewChain(UIView *__strong, UIView *__strong, BOOL)()

原因分析：

  1. 添加摄像头预览视图的layer

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       @property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;
   //覆盖视图
   @property (nonatomic, strong) UIView *overlayView;

   [self.view.layer insertSublayer:_preview atIndex:0];

  2. 添加遮罩层

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       //问题行：    [self.view addSubview:self.overlayView];
   [self.view.layer insertSublayer:self.overlayView.layer atIndex:2];

结论：在VC初始化过程，self.view添加视图时，被添加的对象只能是一种，要么通过图层，要么添加UIView视图。同时添加会造成上述错误。参考： DEBUG - UIView.h#190 | 继刚的博客 Assertion failure in void UIViewReportBrokenSuperviewChain(UIView *__strong, …

UIButton layer层无法点击问题

解决办法，借助导航条实现：

  1. 目前只需要一个返回按钮，使用在导航条上添加返回按钮，避开在self.view添加button layer。

  2. 设置导航条透明IOS开发-UINavigationBar透明设置 - 简书

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-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];
    [self.navigationController.navigationBar setShadowImage:[UIImage new]];
}