Application tried to present modal view controller on itself Presenting controller is UISea...

内容简介：近几天在测试公司项目时，遇到一个UISearchController崩溃的问题。问题似乎是iOS11之后，系统试图恢复firstResponder状态。在关闭视图之前，设置searchController的active为NO，例如：

Terminating app due to uncaught exception 'NSInvalidArgumentException', 
reason: 'Application tried to present modal view controller on itself. 
Presenting controller is <UISearchController: >.'

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
   self.searchController.active = NO; // Add this !
   ...

   [self dismissViewControllerAnimated:YES completion:nil];
}

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