无法在子窗口中访问“def”-“MainWindow对象没有属性'updateTime'”

你的问题从这行开始

self.MyButton.clicked.connect(lambda: widgetWindow.start(self))

让我们去构造它在做什么。

1. 你有一个按钮, self.MyButton 它存在于类的实例中 MainWindow (在 main() 功能)

2. 您正在连接到 clicked 按钮的信号。

3. 连接到此信号的函数是 lambda 功能 调用类中的函数 widgetWindow 注意,这与调用类实例的方法不同。您没有在此处实例化类(您没有创建对象)。你是说,使用方法定义 start 在课堂上 小部件窗口 但使其作用于对象 self 哪里 自己 是类的实例 主窗口 .

希望你现在开始看到你所做的事情的问题。而不是创建 小部件窗口 类,您尝试使用 小部件窗口 好像这是一种 主窗口 。如果您仍然有困难(尤其是如果您不清楚类和对象之间的区别),我建议您阅读更多关于Python中面向对象编程的内容,以了解这一点

因此,解决方案是创建 小部件窗口 (而不是直接访问类的方法),并将按钮连接到该实例的方法。我已经修改了你的代码来实现这一点,这在下面发布。我已经对我更改的部分进行了评论。如果你对我的所作所为有疑问,请告诉我。

from PyQt4 import QtGui, QtCore
from PyQt4 import *
from PyQt4.QtCore import *
import sys

CurrentTime = 0

class MainWindow(QtGui.QMainWindow):
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.central = QtGui.QWidget(self)
        self.setCentralWidget(self.central)

        self.hboxPB = QtGui.QHBoxLayout()
        self.vboxPB = QtGui.QVBoxLayout()
        self.MyButton = QtGui.QPushButton(self.central)
        self.MyButton.setText("Push Me")
        self.hboxPB.addWidget(self.MyButton)
        self.vboxPB.addLayout(self.hboxPB)
        self.MyButton.resize(90,90)

        # instantiate the widgetWindow (pass this window as the parent)
        self.widgetwindow = widgetWindow(self)
        # connect the button to the start method of this instance we created above
        self.MyButton.clicked.connect(self.widgetwindow.start)

# no need to subclass QWidget here. This is just a wrapper class to hold your main window
class widgetWindow(object):
    def __init__(self, parent = None):
        # Store the parent for use later
        self.parent = parent

    def start(self):
        # change the window parent to be the parent we stored in the __init__ method
        window = QtGui.QMainWindow(self.parent)
        window.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        # Add a signal to stop the timer when the window is destroyed
        window.destroyed.connect(self.stopTimer)
        CentralWidget = QtGui.QWidget()
        # Change the parent to be the window we just created
        self.timeSlider = QtGui.QSlider(QtCore.Qt.Horizontal, window)
        CentralWidgetLayout = QtGui.QHBoxLayout()
        VBox = QtGui.QVBoxLayout()
        CentralWidgetLayout.addWidget(self.timeSlider)
        VBox.addLayout(CentralWidgetLayout)
        CentralWidget.setLayout(VBox)
        window.setCentralWidget(CentralWidget)
        window.show()

        self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.updateTime)
        self.timer.start(1000)

    def updateTime(self):
        global CurrentTime
        CurrentTime = CurrentTime + 1
        self.timeSlider.setValue(CurrentTime)

    # Method to stop the timer once the window is destroyed
    def stopTimer(self):
        self.timer.stop()

def main():
    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    win.show()
    win.resize(800,450)
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

试试看:

from PyQt4 import QtGui, QtCore
from PyQt4 import *
from PyQt4.QtCore import *
import sys

CurrentTime = 0
class widgetWindow(QtGui.QWidget):
    def __init__(self, parent = None):
        QtGui.QWidget.__init__(self,parent)
        super(widgetWindow, self).__init__()
        widgetWindow.start(self)

    def start(self):
        window = QtGui.QMainWindow(self)
        window.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        CentralWidget = QtGui.QWidget()
        self.timeSlider = QtGui.QSlider(QtCore.Qt.Horizontal, self)
        CentralWidgetLayout = QtGui.QHBoxLayout()
        VBox = QtGui.QVBoxLayout()
        CentralWidgetLayout.addWidget(self.timeSlider)
        VBox.addLayout(CentralWidgetLayout)
        CentralWidget.setLayout(VBox)
        window.setCentralWidget(CentralWidget)
        window.show()

        self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.updateTime)
        self.timer.start(1000)

    def updateTime(self):
        global CurrentTime
        CurrentTime = CurrentTime + 1
        self.timeSlider.setValue(CurrentTime)



class MainWindow(QtGui.QMainWindow,widgetWindow):#here add subclass
    def __init__(self, parent=None):
        QtGui.QMainWindow.__init__(self, parent)
        self.central = QtGui.QWidget(self)
        self.setCentralWidget(self.central)

        self.hboxPB = QtGui.QHBoxLayout()
        self.vboxPB = QtGui.QVBoxLayout()
        self.MyButton = QtGui.QPushButton(self.central)
        self.MyButton.setText("Push Me")
        self.hboxPB.addWidget(self.MyButton)
        self.vboxPB.addLayout(self.hboxPB)
        self.MyButton.resize(90,90)
        self.MyButton.clicked.connect(lambda: widgetWindow.start(self))



def main():
    app = QtGui.QApplication(sys.argv)
    win = MainWindow()
    win.show()
    win.resize(800,450)
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

您的命名空间错误。必须确保使用正确的命名空间,否则解释器不知道查找类的正确位置。