Merge pull request #420 from wisfern/for_pr

修改QtUi的BUG，其他模块找不到BASIC_FONT，把BASIC_FONT的初始化从函数内移到函数外

vnpy/trader/uiQt.py

@@ -7,6 +7,13 @@ from qtpy import QtWidgets, QtGui, QtCore
 from vnpy.trader.vtGlobal import globalSetting
 from vnpy.trader.vtFunction import loadIconPath
 
+BASIC_FONT = None
+try:
+    family = globalSetting['fontFamily']
+    size = globalSetting['fontSize']
+    BASIC_FONT = QtGui.QFont(family, size)
+except:
+    BASIC_FONT = QtGui.QFont(u'微软雅黑', 12)
 
 #----------------------------------------------------------------------
 def createQApp():
@@ -28,12 +35,6 @@ def createQApp():
         ctypes.windll.shell32.SetCurrentProcessExplicitAppUserModelID('vn.trader')  
     
     # 设置Qt字体
-    try:
-        family = globalSetting['fontFamily']
-        size = globalSetting['fontSize']
-        BASIC_FONT = QtGui.QFont(family, size)
-    except:
-        BASIC_FONT = QtGui.QFont(u'微软雅黑', 12)
     qApp.setFont(BASIC_FONT)
     
     # 设置Qt图标