Z-order assignment: " is not a valid widget.

在对Qt进行编译的时候，检测UI文件时出现了这样的警告：

Z-order assignment: " is not a valid widget.

于是，上网查得资料，得知在UI文件中有一处是可以更改部件的添加顺序的。

由于我这里的 <zorder></zorder> 本来为空，所以问题就解决了。

参考下面链接的资料解决的问题：

/article/3669548.html

下面内容引用该链接的内容：

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;"><span class="pln" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;">Qt编程，某窗口的部件出现了这个错误</span></code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;"><span class="pln" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;">Z</span><span class="pun" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;">-</span><span class="pln" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;">order assignment</span><span class="pun" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;">:</span><span class="pln" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(0, 0, 0); vertical-align: baseline; background-color: transparent;"> </span><span class="str" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(128, 0, 0); vertical-align: baseline; background-color: transparent;">" is not a valid widget.</span></code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;"><span class="str" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(128, 0, 0); vertical-align: baseline; background-color: transparent;">参见</span></code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;"><span class="str" style="padding: 0px; margin: 0px; border-width: 0px; color: rgb(128, 0, 0); vertical-align: baseline; background-color: transparent;"><a target=_blank href="http://stackoverflow.com/questions/6831546/qvision-widget-error-upon-compile" style="padding: 0px; margin: 0px; border: none; color: rgb(1, 95, 145); text-decoration: none; background: none;"><span style="color:#336699;padding: 0px; margin: 0px;">http://stackoverflow.com/questions/6831546/qvision-widget-error-upon-compile</span></a>
</span></code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;">
</code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;"><span style="padding: 0px; margin: 0px;">	</span>Z-order 在Qt的ui文件中，定义的好像是显示部件的添加顺序。</code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;">如</code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;">  </widget>
  <zorder>label_info</zorder>
  <zorder>start_fb1</zorder>
  <zorder>stop_fb1</zorder>
  <zorder>show_image</zorder>
  <zorder>close</zorder>
  <zorder>groupBoxList</zorder>
  <zorder>groupBoxList</zorder>
  <zorder>layoutWidget_2</zorder>
  <zorder>label_time</zorder>
  <zorder>label_logo</zorder>
  <zorder>tabWidget</zorder>
  <zorder>label_control</zorder>
  <zorder>show_image_2</zorder>
 </widget>
</code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;">
</code>

<code style="padding: 0px; margin: 0px; border-width: 0px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline;">修改这个可以认为更改部件的添加顺序，从而得到后者覆盖前者的效果。</code>