//當(dāng)用戶(hù)錄屏 怎么辦 目前來(lái)說(shuō) 只能進(jìn)行提示。監(jiān)聽(tīng)到就返回上一頁(yè)，并彈出提示
1，檢測(cè)當(dāng)前設(shè)備是否在錄屏：

pragma mark -- 錄屏

• (void)addLuPingJianTing{
  //監(jiān)測(cè)當(dāng)前設(shè)備是否處于錄屏狀態(tài)
  UIScreen * sc = [UIScreen mainScreen];
  if (@available(iOS 11.0,*)) {
  if (sc.isCaptured) {
  NSLog(@"正在錄制-----%d",sc.isCaptured);
  // 延遲三秒去執(zhí)行
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  [self.navigationController popViewControllerAnimated:YES];
  });
  // 延遲三秒去執(zhí)行
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  NormalAlartView view = [[[NSBundle mainBundle] loadNibNamed:@"NormalAlartView" owner:self options:nil] lastObject];
  view.isLuPing = YES;
  view.titleLabel.text = LocalizedString(@"為保護(hù)教程版權(quán)，請(qǐng)停止錄屏操作！");
  view.sureBtn.hidden = YES;
  [view.cancleBtn setTitle:LocalizedString(@"我知道了") forState:(UIControlStateNormal)];
  [view show];
  });
  }
  }
  //ios11之后才可以錄屏
  if (@available(iOS 11.0,)) {
  //檢測(cè)設(shè)備
  [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(tipsVideoRecord) name:UIScreenCapturedDidChangeNotification object:nil];
  }
  }
  iOS 11.0之后 可以通過(guò)通知檢測(cè)檢測(cè)設(shè)備錄屏
• (void)tipsVideoRecord {
  UIScreen * sc = [UIScreen mainScreen];
  if (@available(iOS 11.0,*)) {
  if (sc.isCaptured) {
  // 延遲三秒去執(zhí)行
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.5 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
  NormalAlartView *view = [[[NSBundle mainBundle] loadNibNamed:@"NormalAlartView" owner:self options:nil] lastObject];
  view.isLuPing = YES;
  view.titleLabel.text = LocalizedString(@"為保護(hù)教程版權(quán)，請(qǐng)不要錄屏！");
  view.sureBtn.hidden = YES;
  [view.cancleBtn setTitle:LocalizedString(@"我知道了") forState:(UIControlStateNormal)];
  [view show];
  });
  }
  }
  }