//設Cell可編輯- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath{  return YES;}//設置刪除按鈕-(UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{  return UITableViewCellEditingStyleDelete;}//進入編輯（刪除）模式-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{    //出現alterView隱藏刪除按鈕  [tableView setEditing:NO animated:YES];  if (editingStyle == UITableViewCellEditingStyleDelete) {    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提示" message:@"你確定刪除該消息？" preferredStyle:UIAlertControllerStyleAlert];    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];    [alertController addAction:[UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {      //需要先刪除數據源中對應數據，不然執行下一步會崩潰      [reconnaissanceListArr removeObjectAtIndex:indexPath.row];      [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];    }]];    [self presentViewController:alertController animated:YES completion:nil];  }}//修改編輯按鈕文字-(NSString *)tableView:(UITableView *)tableView titleForDeleteConfirmationButtonForRowAtIndexPath:(NSIndexPath *)indexPath{  return @"刪除";}//設置進入編輯狀態時，Cell不會縮進- (BOOL)tableView: (UITableView *)tableView shouldIndentWhileEditingRowAtIndexPath:(NSIndexPath *)indexPath{  return NO;}