日志内容清空功能。

Gui/Control/LogControl.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>767</width>
-    <height>291</height>
+    <width>831</width>
+    <height>396</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -17,6 +17,33 @@
    <item>
     <widget class="QPlainTextEdit" name="pedText"/>
    </item>
+   <item>
+    <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <spacer name="verticalSpacer">
+       <property name="orientation">
+        <enum>Qt::Orientation::Vertical</enum>
+       </property>
+       <property name="sizeType">
+        <enum>QSizePolicy::Policy::Maximum</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>20</width>
+         <height>4000</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnClear">
+       <property name="text">
+        <string>清空</string>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
   </layout>
  </widget>
  <resources/>