Python 从主窗口内的QWidget内的按钮更改主窗口小部件

因此，我有一个名为

MainWindow

的空主框架和一个

WelcomeWidget

在程序启动时被称为immidatley并在主框架内加载。然后我想让

WelcomeWidget

中的按钮

next\u btn

调用

LicenseWidget

QWidget，调用

Main窗口中的
QWidget
类。我该怎么做

这是我的密码：

Main.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#  Main.py
#  
#  Copyright 2015 Ognjen Galic <gala@thinkpad>
#  
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#  
#  

from PyQt4 import QtGui, QtCore
from MainWindow import Ui_MainWindow
from WelcomeWidget import Ui_welcome_widget
from LicenseWidget import Ui_license_widget
import sys

class WelcomeWidget(QtGui.QWidget, Ui_welcome_widget):
    def __init__(self, parent=None):
        super(WelcomeWidget, self).__init__()
        self.setupUi(self)
        self.cancel_btn.pressed.connect(self.close)
        self.next_btn.pressed.connect(self.license_show)

    def close(self):
        sys.exit(0)

    def license_show(self):
        mainWindow.cw = LicenseWidget(self)
        mainWindow.setCentralWidget(self.cw)

class LicenseWidget(QtGui.QWidget, Ui_license_widget):
    def __init__(self, parent=None):
        super(LicenseWidget, self).__init__()
        self.setupUi(self)

class mainWindow(QtGui.QMainWindow, Ui_MainWindow):

    def __init__(self):
        super(mainWindow, self).__init__()
        self.setupUi(self)
        mainWindow.cw = WelcomeWidget(self)
        self.setCentralWidget(self.cw)

def main():
    app = QtGui.QApplication(sys.argv)
    ui = mainWindow()
    ui.show()
    sys.exit(app.exec_())

main()

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'LicenseWidget.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_license_widget(object):
    def setupUi(self, license_widget):
        license_widget.setObjectName(_fromUtf8("license_widget"))
        license_widget.resize(640, 420)
        license_widget.setMinimumSize(QtCore.QSize(640, 420))
        license_widget.setMaximumSize(QtCore.QSize(640, 420))
        self.frame_btn = QtGui.QFrame(license_widget)
        self.frame_btn.setGeometry(QtCore.QRect(0, 365, 641, 56))
        self.frame_btn.setFrameShape(QtGui.QFrame.StyledPanel)
        self.frame_btn.setFrameShadow(QtGui.QFrame.Raised)
        self.frame_btn.setObjectName(_fromUtf8("frame_btn"))
        self.no_btn = QtGui.QPushButton(self.frame_btn)
        self.no_btn.setGeometry(QtCore.QRect(540, 15, 87, 26))
        self.no_btn.setObjectName(_fromUtf8("no_btn"))
        self.yes_btn = QtGui.QPushButton(self.frame_btn)
        self.yes_btn.setGeometry(QtCore.QRect(430, 15, 87, 26))
        self.yes_btn.setObjectName(_fromUtf8("yes_btn"))
        self.back_btn = QtGui.QPushButton(self.frame_btn)
        self.back_btn.setEnabled(True)
        self.back_btn.setGeometry(QtCore.QRect(346, 15, 87, 26))
        self.back_btn.setCheckable(False)
        self.back_btn.setObjectName(_fromUtf8("back_btn"))
        self.main_frame = QtGui.QFrame(license_widget)
        self.main_frame.setGeometry(QtCore.QRect(0, 0, 640, 75))
        self.main_frame.setMinimumSize(QtCore.QSize(8, 0))
        self.main_frame.setFrameShape(QtGui.QFrame.StyledPanel)
        self.main_frame.setFrameShadow(QtGui.QFrame.Raised)
        self.main_frame.setObjectName(_fromUtf8("main_frame"))
        self.Title = QtGui.QLabel(self.main_frame)
        self.Title.setGeometry(QtCore.QRect(10, 5, 311, 61))
        self.Title.setObjectName(_fromUtf8("Title"))
        self.license_cont = QtGui.QTextEdit(license_widget)
        self.license_cont.setGeometry(QtCore.QRect(0, 74, 640, 260))
        self.license_cont.setObjectName(_fromUtf8("license_cont"))
        self.agree_or_not = QtGui.QLabel(license_widget)
        self.agree_or_not.setGeometry(QtCore.QRect(10, 340, 621, 17))
        self.agree_or_not.setObjectName(_fromUtf8("agree_or_not"))

        self.retranslateUi(license_widget)
        QtCore.QMetaObject.connectSlotsByName(license_widget)

    def retranslateUi(self, license_widget):
        license_widget.setWindowTitle(_translate("license_widget", "Form", None))
        self.no_btn.setText(_translate("license_widget", "No", None))
        self.yes_btn.setText(_translate("license_widget", "Yes", None))
        self.back_btn.setText(_translate("license_widget", "Back", None))
        self.Title.setText(_translate("license_widget", "<html><head/><body><p><span style=\" font-size:11pt; font-weight:600;\">Program License</span></p><p>Please read the license carefully</p></body></html>", None))
        self.license_cont.setHtml(_translate("license_widget", "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n"
"<html><head><meta name=\"qrichtext\" content=\"1\" /><style type=\"text/css\">\n"
"p, li { white-space: pre-wrap; }\n"
"</style></head><body style=\" font-family:\'Droid Sans\'; font-size:10pt; font-weight:400; font-style:normal;\">\n"
"<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\">example license</p></body></html>", None))
        self.agree_or_not.setText(_translate("license_widget", "Do you agree to the license? If you click \"No\", the installer will close.", None))

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'WelcomeWidget.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_welcome_widget(object):
    def setupUi(self, welcome_widget):
        welcome_widget.setObjectName(_fromUtf8("welcome_widget"))
        welcome_widget.resize(640, 420)
        welcome_widget.setMinimumSize(QtCore.QSize(640, 420))
        welcome_widget.setMaximumSize(QtCore.QSize(640, 420))
        self.side_pixmap = QtGui.QLabel(welcome_widget)
        self.side_pixmap.setGeometry(QtCore.QRect(0, 0, 220, 365))
        self.side_pixmap.setText(_fromUtf8(""))
        self.side_pixmap.setPixmap(QtGui.QPixmap(_fromUtf8("media/InstallShield.png")))
        self.side_pixmap.setObjectName(_fromUtf8("side_pixmap"))
        self.welcome_frame = QtGui.QFrame(welcome_widget)
        self.welcome_frame.setGeometry(QtCore.QRect(0, 365, 641, 56))
        self.welcome_frame.setFrameShape(QtGui.QFrame.StyledPanel)
        self.welcome_frame.setFrameShadow(QtGui.QFrame.Raised)
        self.welcome_frame.setObjectName(_fromUtf8("welcome_frame"))
        self.cancel_btn = QtGui.QPushButton(self.welcome_frame)
        self.cancel_btn.setGeometry(QtCore.QRect(540, 15, 87, 26))
        self.cancel_btn.setObjectName(_fromUtf8("cancel_btn"))
        self.next_btn = QtGui.QPushButton(self.welcome_frame)
        self.next_btn.setGeometry(QtCore.QRect(430, 15, 87, 26))
        self.next_btn.setObjectName(_fromUtf8("next_btn"))
        self.back_btn = QtGui.QPushButton(self.welcome_frame)
        self.back_btn.setEnabled(False)
        self.back_btn.setGeometry(QtCore.QRect(346, 15, 87, 26))
        self.back_btn.setObjectName(_fromUtf8("back_btn"))
        self.welcome_header = QtGui.QLabel(welcome_widget)
        self.welcome_header.setEnabled(True)
        self.welcome_header.setGeometry(QtCore.QRect(240, 10, 361, 91))
        font = QtGui.QFont()
        font.setPointSize(20)
        self.welcome_header.setFont(font)
        self.welcome_header.setWordWrap(True)
        self.welcome_header.setObjectName(_fromUtf8("welcome_header"))
        self.welcome_desc = QtGui.QLabel(welcome_widget)
        self.welcome_desc.setGeometry(QtCore.QRect(240, 120, 391, 51))
        self.welcome_desc.setWordWrap(True)
        self.welcome_desc.setObjectName(_fromUtf8("welcome_desc"))

        self.retranslateUi(welcome_widget)
        QtCore.QMetaObject.connectSlotsByName(welcome_widget)

    def retranslateUi(self, welcome_widget):
        welcome_widget.setWindowTitle(_translate("welcome_widget", "Form", None))
        self.cancel_btn.setText(_translate("welcome_widget", "Cancel", None))
        self.next_btn.setText(_translate("welcome_widget", "Next", None))
        self.back_btn.setText(_translate("welcome_widget", "Back", None))
        self.welcome_header.setText(_translate("welcome_widget", "<html><head/><body><p><span style=\" font-size:16pt;\">Welcome to the InstallShield wizard for Google Chrome.</span></p></body></html>", None))
        self.welcome_desc.setText(_translate("welcome_widget", "<html><head/><body><p>This install wizard will install Google Chrome to your computer. To continue press Next.</p></body></html>", None))

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'MainWindow.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(640, 420)
        MainWindow.setMinimumSize(QtCore.QSize(640, 420))
        MainWindow.setMaximumSize(QtCore.QSize(640, 420))
        MainWindow.setToolButtonStyle(QtCore.Qt.ToolButtonIconOnly)
        MainWindow.setAnimated(False)
        self.main_widget = QtGui.QWidget(MainWindow)
        self.main_widget.setObjectName(_fromUtf8("main_widget"))
        MainWindow.setCentralWidget(self.main_widget)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "InstallShield Wizard", None))

如果这在WelcomeWidget类中直接起作用，并告诉MainWindow类这将非常棒

 class WelcomeWidget(QtGui.QWidget, Ui_welcome_widget):
    [ ... ]
    def license_show(self):
        mainWindow.cw = LicenseWidget(self)
        mainWindow.setCentralWidget(self.cw)

有答案的人会得到一个电子饼干
 
QWizard
可能有用。另一种方法是在
QVerticalLayout
中布局这两个小部件，并隐藏您不感兴趣的小部件。可见的占据了所有的空间

它甚至可以完全在QtCreator中构建。。只需
hide（）
你不想看的内容和
show（）
你想看的内容

可以在QtCreator中使用大量小部件构建复杂的布局，并仅显示手头任务所需的内容。
#/usr/bin/env python
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#  Main.py
#  
#  Copyright 2015 Ognjen Galic <gala@thinkpad>
#  
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#  
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#  
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#  MA 02110-1301, USA.
#  
#  

from PyQt4 import QtGui, QtCore
from MainWindow import Ui_MainWindow
from MainWidget import Ui_main_widget
from WelcomeWidget import Ui_welcome_widget
from LicenseWidget import Ui_license_widget
import sys

class mainWindow(QtGui.QMainWindow, Ui_MainWindow):

    def __init__(self):
        super(mainWindow, self).__init__()
        self.setupUi(self)

        mainWindow.welcomeWidget = WelcomeWidget(self)
        mainWindow.licenseWidget = LicenseWidget(self)
        mainWindow.mainWidget = MainWidget(self)

        self.setCentralWidget(self.mainWidget)

        self.mainWidget.addWidget(self.welcomeWidget)

        self.welcomeWidget.next_btn.pressed.connect(self.license_show)
        self.welcomeWidget.cancel_btn.pressed.connect(self.close_cancel)

        self.licenseWidget.cancel_btn.pressed.connect(self.close_cancel)
        self.licenseWidget.back_btn.pressed.connect(self.go_back)

        self.licenseWidget.i_do.toggled.connect(self.accept_license)
        self.licenseWidget.i_dont.toggled.connect(self.dont_accept_license)

    def go_back(self):
            self.mainWidget.removeWidget(self.licenseWidget)
            self.mainWidget.addWidget(self.welcomeWidget)

    def close_cancel(self):
            sys.exit(0)

    def license_show(self):
            self.mainWidget.removeWidget(self.welcomeWidget)
            self.mainWidget.addWidget(self.licenseWidget) 

    def accept_license(self):
            self.licenseWidget.next_btn.setEnabled(True)
    def dont_accept_license(self):
            self.licenseWidget.next_btn.setEnabled(False)


class WelcomeWidget(QtGui.QStackedWidget, Ui_welcome_widget):
    def __init__(self, parent=None):
        super(WelcomeWidget, self).__init__()
        self.setupUi(self, "Linux 2.6.32.68")

class LicenseWidget(QtGui.QStackedWidget, Ui_license_widget):
    def __init__(self, parent=None):
        super(LicenseWidget, self).__init__()
        license_file = open("license.html")
        license_text_file = license_file.read()
        self.setupUi(self, license_text_file)

class MainWidget(QtGui.QStackedWidget, Ui_main_widget):
    def __init__(self, parent=None):
        super(MainWidget, self).__init__()
        self.setupUi(self)

def main():
    app = QtGui.QApplication(sys.argv)
    ui = mainWindow()
    ui.show()
    sys.exit(app.exec_())

main()

#-*-编码：utf-8-*-
#
#Main.py
#  
#版权所有2015 Ognjen Galic
#  
#这个程序是自由软件；您可以重新分发和/或修改它
#它是根据GNU通用公共许可证的条款发布的
自由软件基金会；许可证的第2版，或
#（由您选择）任何更高版本。
#  
#这个节目的发布是希望它会有用，
#但无任何保证；甚至没有任何关于
#适销性或适合某一特定目的。见
#有关更多详细信息，请参阅GNU通用公共许可证。
#  
#您应该已经收到GNU通用公共许可证的副本
#与此同时,；如果没有，请写信给自由软件
波士顿基金会51楼富兰克林街第五楼
#MA 02110-1301，美国。
#  
#  
从PyQt4导入QtGui、QtCore
从主窗口导入Ui\u主窗口
从MainWidget导入Ui\u main\u小部件
从WelcomeWidget导入Ui\u欢迎\u widget
从LicenseWidget导入Ui\u license\u widget
导入系统
类主窗口（QtGui.QMainWindow，Ui\U主窗口）：
定义初始化（自）：
超级（主窗口，自我）。\uuuu初始化
self.setupUi（self）
mainWindow.welcomeWidget=welcomeWidget（自身）
mainWindow.licenseWidget=licenseWidget（自身）
mainWindow.mainWidget=mainWidget（自身）
self.setCentralWidget（self.mainWidget）
self.mainWidget.addWidget（self.welcomeWidget）
self.welcomeWidget.next\u btn.pressed.connect（self.license\u show）
self.welcomeWidget.cancel\u btn.pressed.connect（self.close\u cancel）
self.licenseWidget.cancel\u btn.pressed.connect（self.close\u cancel）
self.licenseWidget.back\u btn.pressed.connect（self.go\u back）
self.licenseWidget.i\u do.toggled.connect（self.accept\u license）
self.licenseWidget.i\u not.toggled.connect（self.don\u accept\u license）
def返回（自我）：
self.mainWidget.removeWidget（self.licenseWidget）
self.mainWidget.addWidget（self.welcomeWidget）
def关闭_取消（自身）：
系统出口（0）
def许可证展示（自我）：
self.mainWidget.removeWidget（self.welcomeWidget）
self.mainWidget.addWidget（self.licenseWidget）
def接受_许可证（自我）：
self.licenseWidget.next_btn.setEnabled（True）
def不接受许可证（自我）：
self.licenseWidget.next_btn.setEnabled（False）
类WelcomeWidget（QtGui.QStackedWidget，Ui\u welcome\u widget）：
def uuu init uuu（self，parent=None）：
超级（WelcomeWidget，self）。\uuu初始化
self.setupUi（self，“Linux2.6.32.68”）
类LicenseWidget（QtGui.QStackedWidget，Ui_license_widget）：
def uuu init uuu（self，parent=None）：
超级（LicenseWidget，self）。\uuuu init\uuuuu（）
许可证文件=打开（“license.html”）
许可证\文本\文件=许可证\文件.read（）
self.setupUi（self，许可证\文本\文件）
类MainWidget（QtGui.QStackedWidget，Ui_main_widget）：
def uuu init uuu（self，parent=None）：
超级（MainWidget，self）。\uuuu init\uuuuu（）
self.setupUi（self）
def main（）：
app=QtGui.QApplication（sys.argv）
ui=主窗口（）
ui.show（）
sys.exit（app.exec_（））
main（）

这很有效。感谢所有帮助过你的人。
你真的不能使用QWizardPage吗？