获取相机权限 和 打开相机权限

-(void)openCamera {
    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
    NSLog(@"openCamera_status == %ld",(long)status);
    if (status == AVAuthorizationStatusAuthorized){
        //已经授权了
        
    } else if (status == AVAuthorizationStatusNotDetermined){
        //获取权限
        [AVCaptureDevice requestAccessForMediaType:AVMediaTypeVideo completionHandler:^(BOOL granted) {

            dispatch_async(dispatch_get_main_queue(), ^{

                if (granted) {
                    //允许访问
                }else{
                    //不允许访问
                }

            });
        }];
    }else if (status == AVAuthorizationStatusDenied || status == AVAuthorizationStatusRestricted){ //否认
        //提示打开
        NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
        if ([[UIApplication sharedApplication]canOpenURL:url]) {
              [[UIApplication sharedApplication] openURL:url];
        }
    }
}