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];
}