关闭键盘方法总结

//tableview滚动时关闭键盘
 _tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;

//重载触摸方法，点击其他位置关闭键盘，由于有tableview(scrollview)，暂时无效，需要写到viewdiddrag里面
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [super touchesBegan:touches withEvent:event];
    [self.view endEditing:YES];
}

//拿到textfield，移除第一响应者
[_textField resignFirstResponder]

//调用系统通知关闭
[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];
[[[UIApplication sharedApplication] keyWindow] endEditing:YES];