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：

---

import PyQt4.uic
from PyQt4 import QtCore, QtGui

MainWindowForm, 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_()

---

第二种：

---

import PyQt4.uic
from PyQt4 import QtCore, QtGui

class 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_()

---

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。

---

# -*- coding: utf-8 -*-
from PySide import QtGui

import xml.etree.ElementTree as xml
from cStringIO import StringIO


def 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(), '', '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)

---

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