修正state判断错误，Qt.Checked.value才是int类型

Author: sltlala

03-QtWidgets-常用控件/02-Button-按钮控件/04-QCheckBox-复选框/03-QCheckBox-信号.py

@@ -30,11 +30,11 @@ def test_01(self) -> None:
 
         @QtCore.Slot(int)
         def test_slot(state: int) -> None:
-            if state == Qt.Checked:
+            if state == Qt.Checked.value:
                 print("复选框被选中了！")
-            elif state == Qt.Unchecked:
+            elif state == Qt.Unchecked.value:
                 print("复选框被取消选中了！")
-            elif state == Qt.PartiallyChecked:
+            elif state == Qt.PartiallyChecked.value:
                 print("复选框被部分选中！")
 
         self.cb.stateChanged.connect(test_slot)  # type: ignore