PySide和PyQt加载ui文件的两种方法

在用PySide或PyQt的时候，经常用到要将画好的ui文件导入到代码里使用，下面是两种调入的方法：

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import PyQt4.uicfrom PyQt4 import QtCore, QtGuiMainWindowForm, MainWindowBase = PyQt4.uic.loadUiType('ui/mainwindow.ui')class MainWindow(MainWindowBase, MainWindowForm):    def __init__(self, parent = None):        super(MainWindow, self).__init__(parent)        # setup the ui        self.setupUi(self)if ( __name__ == '__main__' ):    app = None    if ( not app ):        app = QtGui.QApplication([])    window = MainWindow()    window.show()    if ( app ):        app.exec_()

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第二种：

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import PyQt4.uicfrom PyQt4 import QtCore, QtGuiclass MainWindow(QtGui.QMainWindow):    def __init__(self, parent = None):        super(MainWindow, self).__init__(parent)        # load the ui        PyQt4.uic.loadUi('ui/mainwindow.ui', self)if ( __name__ == '__main__' ):    app = None    if ( not app ):        app = QtGui.QApplication([])    window = MainWindow()    window.show()    if ( app ):        app.exec_()

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当然如果是用PySide的话，我们可以写个专门读取ui文件的方法，将baseclass和formclass返回出去，供后面UI的类继承。

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# -*- coding: utf-8 -*-from PySide import QtGuiimport xml.etree.ElementTree as xmlfrom cStringIO import StringIOdef load_ui_file(ui_file, type='PySide'):    if type == 'PySide':        import pysideuic        print pysideuic        parsed = xml.parse(ui_file)        widget_class = parsed.find('widget').get('class')        form_class = parsed.find('class').text        with open(ui_file, 'r') as f:            o = StringIO()            frame = {}            pysideuic.compileUi(f, o, indent=0)            pyc = compile(o.getvalue(), '<string>', 'exec')            exec pyc in frame            form_class = frame['Ui_%s' % form_class]            base_class = getattr(QtGui, widget_class)        return form_class, base_class    elif type == 'PyQt4':        import PyQt4.uic        return PyQt4.uic.loadUiType(ui_file)if __name__ == "__main__":    ui_file = 'test.ui'    load_ui_file(ui_file)

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这样Pyside和PyQt就可以调用.ui文件了，而且这两种调用方法的性能和占用的内存都有人专门测试过，但作者也比较推荐第一种方法，详细情况请看下面的链接。

PyQt load .ui file