摄像头（闪光灯）权限 的判断

   

 NSString * mediaType = AVMediaTypeVideo;  //相应的还有麦克风权限字符串等等

    AVAuthorizationStatus  authorizationStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];

    if (authorizationStatus == AVAuthorizationStatusRestricted|| authorizationStatus == AVAuthorizationStatusDenied) {

 

        [self alertWithTitle:@"摄像头访问受阻" andMessage:@"请到设置中修改权限"];

    }else if (

authorizationStatus ==

AVAuthorizationStatusNotDetermined

) {

//第一次打开，应用还没有授权询问

){

        WTLog(@"可以使用摄像头");

        //开启扫描回话

        [self scanSession];

    }