Question

我是Python，QT4和pyqt的新手，我无法使用setCurrentIndex来更改小部件。我确定我没有正确使用它，但这是我的初始代码。首先是pyqt代码：

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

# Form implementation generated from reading ui file 'mainwindow.ui'
#
# Created: Thu May  5 17:15:28 2016
#      by: PyQt4 UI code generator 4.9.3
#
# WARNING! All changes made in this file will be lost!

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    _fromUtf8 = lambda s: s

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(400, 300)
        self.centralWidget = QtGui.QWidget(MainWindow)
        self.centralWidget.setObjectName(_fromUtf8("centralWidget"))
        self.stackedWidget = QtGui.QStackedWidget(self.centralWidget)
        self.stackedWidget.setGeometry(QtCore.QRect(-41, -41, 451, 311))
        self.stackedWidget.setObjectName(_fromUtf8("stackedWidget"))
        self.page = QtGui.QWidget()
        self.page.setObjectName(_fromUtf8("page"))
        self.label = QtGui.QLabel(self.page)
        self.label.setGeometry(QtCore.QRect(180, 70, 50, 16))
        self.label.setObjectName(_fromUtf8("label"))
        self.pushButton = QtGui.QPushButton(self.page)
        self.pushButton.setGeometry(QtCore.QRect(170, 140, 80, 27))
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.stackedWidget.addWidget(self.page)
        self.page_2 = QtGui.QWidget()
        self.page_2.setObjectName(_fromUtf8("page_2"))
        self.label_2 = QtGui.QLabel(self.page_2)
        self.label_2.setGeometry(QtCore.QRect(200, 90, 50, 16))
        self.label_2.setObjectName(_fromUtf8("label_2"))
        self.stackedWidget.addWidget(self.page_2)
        MainWindow.setCentralWidget(self.centralWidget)

        self.retranslateUi(MainWindow)
        self.stackedWidget.setCurrentIndex(0)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(QtGui.QApplication.translate("MainWindow", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
        self.label.setText(QtGui.QApplication.translate("MainWindow", "Page 1", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "Go to 2", None, QtGui.QApplication.UnicodeUTF8))
        self.label_2.setText(QtGui.QApplication.translate("MainWindow", "Page 2", None, QtGui.QApplication.UnicodeUTF8))

以下是我正在尝试的代码：

导入系统来自表格导入*

class MyDialog(QtGui.QMainWindow):
  def __init__(self, parent=None):
     QtGui.QWidget.__init__(self, parent)
     self.ui = Ui_MainWindow()
     self.ui.setupUi(self)
     self.ui.pushButton.clicked.connect(self.Change)

  def Change(self):
     self.stackedWidget.setCurrentIndex(1)

if __name__ == "__main__":
   app = QtGui.QApplication(sys.argv)
   myapp = MyDialog()
   myapp.show()
   sys.exit(app.exec_())

当我按下按钮时，我收到错误“'MyDialog'对象没有属性'stackedWidget'。

我确信这对有经验的程序员来说很容易。

Answer 1

错误消息的含义正是它所说的：MyDialog没有创建名为self.stackedWidget的成员变量，但它试图在Change中访问这样的变量，所以单击按钮时会引发AttributeError。您想要的变量是self.ui的成员，它是UI_MainWindow的实例。

解决方案是将方法Change更改为：

def Change(self):
    self.ui.stackedWidget.setCurrentIndex(1)

使用pyqt的stackedWidget

1 个答案: