如何让班级重新运转

Question

我现在用pyqt做计时器。 如果我在self.now中输入一个时间，时间就会被减少

当时间减少到零时，会弹出一个窗口，说“再试一次？”

当我按下“是”按钮时，我想再次倒计时。 当按下“Yes”（是）按钮时，此代码不会自行设置

减少计数窗口

弹出窗口

这是我的密码

import sys

from PyQt5 import QtCore, QtGui, uic
from PyQt5 import QtWidgets
from PyQt5 import uic
from PyQt5.QtCore import pyqtSlot

class MainWindow(QtWidgets.QDialog):

    def __init__(self, parent=None):
         super(MainWindow, self).__init__(parent)
         uic.loadUi('Mainwindow.ui', self)
         self.timer = QtCore.QTimer()
         self.now = 10
         self.cnt_set = 0
         self.timer.timeout.connect(self.tick_timer)
         self.timer.start(1000)
         self.update_timer()

    def update_timer(self):
        self.runtime = "%02d:%02d" % (self.now/60,self.now % 60)
        self.lcdNumber.display(self.runtime)

        if self.now == 0:
            self.cnt_set += 1
            print(self.cnt_set)
            self.stop_timer()
            self.mw_CONTINUE = CONTINUE()
            self.mw_CONTINUE.show()

    def tick_timer(self):
        self.now -= 1
        self.update_timer()

    def stop_timer(self):
         self.timer.stop()


class CONTINUE(QtWidgets.QDialog):

    def __init__(self, parent=None):
        QtWidgets.QDialog.__init__(self, parent)
        self.ui = uic.loadUi("continue.ui", self)
        self.Button1.clicked.connect(self.B1_clicked)

    def B1_clicked(self):
        self.hide()
        print("B1 clicked!")
        MainWindow()


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mw_NFC = MainWindow()
    mw_NFC.show()
    sys.exit(app.exec_())

Answer 1

我替你记下了我改的台词。 试试看

import sys
from PyQt5 import QtCore, QtGui, QtWidgets #, uic
#from PyQt5.QtCore import pyqtSlot


class MainWindow(QtWidgets.QDialog):

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

#         uic.loadUi('Mainwindow.ui', self)
        self.lcdNumber = QtWidgets.QLCDNumber(self)

        self.timer = QtCore.QTimer()
        self.now = 10
        self.cnt_set = 0
        self.timer.timeout.connect(self.tick_timer)
#        self.timer.start(1000)                                    # -
        self.update_timer()

    def update_timer(self):
        self.timer.start(1000)                                     # +
        self.runtime = "%02d:%02d" % (self.now / 60, self.now % 60)
        self.lcdNumber.display(self.runtime)

        if self.now == 0:
            self.cnt_set += 1
            print("cnt_set = {}".format(self.cnt_set))
            self.stop_timer()
            self.mw_CONTINUE = CONTINUE(self)                       # + self
            self.mw_CONTINUE.show()

    def tick_timer(self):
        self.now -= 1
        self.update_timer()

    def stop_timer(self):
         self.timer.stop()


class CONTINUE(QtWidgets.QDialog):

    def __init__(self, parent=None):
        QtWidgets.QDialog.__init__(self, parent)

        self.parent = parent                                        # +

#        self.ui = uic.loadUi("continue.ui", self)
        self.Button1 = QtWidgets.QPushButton("Try again?", self)
        self.Button1.clicked.connect(self.B1_clicked)

    def B1_clicked(self):
        self.hide()
        print("B1 clicked!")
#        MainWindow()                                                # -
        self.parent.now = 10                                         # +
        self.parent.update_timer()                                   # +


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mw_NFC = MainWindow()
    mw_NFC.show()
    sys.exit(app.exec_())