PyQt5 通过.qrc在QPushButton上加载iconfont图标库

font.qrc内容

<RCC>
    <qresource prefix="/">
        <file>font/fontawesome-webfont.ttf</file>
        <file>font/iconfont.ttf</file>
        <file>font/pe-icon-set-weather.ttf</file>
    </qresource>
</RCC>

将font.qrc转化成font_rc.py文件（转化方法这里省略）

测试代码： 

import sys
from PyQt5.QtGui import QFont, QFontDatabase
from PyQt5.QtWidgets import QApplication, QMainWindow, QPushButton, QVBoxLayout, QWidget

from fclass.core.core_qthelper.qrc import font_rc


class IconHelper:
    fontId = None
    fontFamily = None

    @staticmethod
    def loadFont(fontFile):
        if IconHelper.fontId is None:
            IconHelper.fontId = QFontDatabase.addApplicationFont(fontFile)
            if IconHelper.fontId == -1:
                raise RuntimeError('Failed to load icon font')
            IconHelper.fontFamily =