PyQt5 QLCD倒计时

Question

我正在努力为 gui 构建一个带有倒数计时器的应用程序，请参见下图：

在左下角，您可以设置时间。 橙色按钮是将开始时间放入程序以及绿色液晶显示器中。 使用开始按钮，我试图启动绿色液晶显示器以倒计时秒数。 但是我无法让它工作。 Programm 只是退出，什么都不做。 我希望你能检查我的代码并告诉我我需要更改的内容。 编辑：试图用计时器来实现它。 只是显示实际时间。 运行 updateLCD 时，应用程序只需找到新的 gui 代码和下面的 Control 代码。

似乎 the.display() function 杀死了应用程序。 如果我将其注释掉，什么都没有发生，但应用程序保持打开状态。 非常感谢。

First.pyw代码： from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_set_time(object):
    def setupUi(self, set_time):
        set_time.setObjectName("set_time")
        set_time.resize(1125, 824)
        self.job_time = QtWidgets.QTimeEdit(set_time)
        self.job_time.setGeometry(QtCore.QRect(10, 770, 231, 41))
        self.job_time.setStyleSheet("font: 75 16pt \"MS Shell Dlg 2\";")
        self.job_time.setTime(QtCore.QTime(0, 0, 0))
        self.job_time.setObjectName("job_time")
        self.start_button = QtWidgets.QPushButton(set_time)
        self.start_button.setGeometry(QtCore.QRect(960, 40, 150, 90))
        self.start_button.setStyleSheet("font: 75 22pt \"MS Shell Dlg 2\";\n"
"background-color: rgb(0, 255, 0);")
        self.start_button.setAutoDefault(False)
        self.start_button.setDefault(False)
        self.start_button.setFlat(False)
        self.start_button.setObjectName("start_button")
        self.pause_button = QtWidgets.QPushButton(set_time)
        self.pause_button.setGeometry(QtCore.QRect(960, 140, 150, 90))
        self.pause_button.setStyleSheet("background-color: rgb(255, 255, 0);\n"
"font: 75 22pt \"MS Shell Dlg 2\";")
        self.pause_button.setObjectName("pause_button")
        self.finish_button = QtWidgets.QPushButton(set_time)
        self.finish_button.setGeometry(QtCore.QRect(960, 240, 150, 90))
        self.finish_button.setStyleSheet("background-color: rgb(0, 85, 255);\n"
"font: 75 22pt \"MS Shell  2\";\n"
"color: rgb(255, 255, 255);")
        self.finish_button.setObjectName("finish_button")
        self.label = QtWidgets.QLabel(set_time)
        self.label.setGeometry(QtCore.QRect(10, 720, 231, 40))
        self.label.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.label.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.label.setLineWidth(10)
        self.label.setMidLineWidth(10)
        self.label.setObjectName("label")
        self.kill_Button = QtWidgets.QPushButton(set_time)
        self.kill_Button.setGeometry(QtCore.QRect(960, 720, 150, 90))
        self.kill_Button.setObjectName("kill_Button")
        self.label_2 = QtWidgets.QLabel(set_time)
        self.label_2.setGeometry(QtCore.QRect(260, 720, 261, 40))
        self.label_2.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.label_2.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.label_2.setLineWidth(10)
        self.label_2.setMidLineWidth(10)
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(set_time)
        self.lineEdit.setGeometry(QtCore.QRect(260, 770, 261, 41))
        self.lineEdit.setObjectName("lineEdit")
        self.remaining_time = QtWidgets.QLCDNumber(set_time)
        self.remaining_time.setGeometry(QtCore.QRect(0, 50, 911, 221))
        self.remaining_time.setStyleSheet("background-color: rgb(0, 0, 0);\n"
"color: rgb(0, 255, 0);")
        self.remaining_time.setDigitCount(8)
        self.remaining_time.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.remaining_time.setObjectName("remaining_time")
        self.label_3 = QtWidgets.QLabel(set_time)
        self.label_3.setGeometry(QtCore.QRect(0, 10, 911, 40))
        self.label_3.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.label_3.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.label_3.setLineWidth(10)
        self.label_3.setMidLineWidth(10)
        self.label_3.setObjectName("label_3")
        self.extra_time = QtWidgets.QLCDNumber(set_time)
        self.extra_time.setGeometry(QtCore.QRect(0, 320, 911, 221))
        self.extra_time.setStyleSheet("background-color: rgb(0, 0, 0);\n"
"color: rgb(255, 0, 0);")
        self.extra_time.setDigitCount(8)
        self.extra_time.setSegmentStyle(QtWidgets.QLCDNumber.Flat)
        self.extra_time.setObjectName("extra_time")
        self.label_4 = QtWidgets.QLabel(set_time)
        self.label_4.setGeometry(QtCore.QRect(0, 280, 911, 40))
        self.label_4.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.label_4.setFrameShadow(QtWidgets.QFrame.Sunken)
        self.label_4.setLineWidth(10)
        self.label_4.setMidLineWidth(10)
        self.label_4.setObjectName("label_4")
        self.set_button = QtWidgets.QPushButton(set_time)
        self.set_button.setGeometry(QtCore.QRect(530, 720, 150, 90))
        self.set_button.setStyleSheet("background-color: rgb(255, 170, 0);\n"
"font: 75 16pt \"MS Shell Dlg 2\";")
        self.set_button.setObjectName("set_button")

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

    def retranslateUi(self, set_time):
        _translate = QtCore.QCoreApplication.translate
        set_time.setWindowTitle(_translate("set_time", "Dialog"))
        self.job_time.setWhatsThis(_translate("set_time", "<html><head/><body><p>Hier die Zeit für den Auftrag eintragen</p><p><br/></p></body></html>"))
        self.job_time.setDisplayFormat(_translate("set_time", "HH:mm:ss"))
        self.start_button.setText(_translate("set_time", "Start"))
        self.pause_button.setText(_translate("set_time", "Pause"))
        self.finish_button.setText(_translate("set_time", "Fertig"))
        self.label.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:14pt; font-weight:600;\">Vorgabe Zeit:</span></p></body></html>"))
        self.kill_Button.setText(_translate("set_time", "Beenden"))
        self.label_2.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:14pt; font-weight:600;\">Auftragsnummer:</span></p><p><br/></p></body></html>"))
        self.label_3.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:16pt; font-weight:600;\">Verbleibende Zeit:</span></p></body></html>"))
        self.label_4.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:16pt; font-weight:600;\">Überzogene Zeit:</span></p></body></html>"))
        self.set_button.setText(_translate("set_time", "Setzen"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    set_time = QtWidgets.QDialog()
    ui = Ui_set_time()
    ui.setupUi(set_time)
    set_time.show()
    sys.exit(app.exec_())

其次是控制代码：

from PyQt5 import QtWidgets, QtCore, QtGui
import StortiTimer

class ControlLCD(QtWidgets.QWidget):
    def __init__(self, parent = None):
        QtWidgets.QWidget.__init__(self, parent)
        self.ui = StortiTimer.Ui_set_time()
        self.ui.setupUi(self)
        self.timer = QtCore.QTimer()
        self.timer.timeout.connect(self.updateLCD)
        self.timer.start(1000)


    def updateLCD(self):
        self.currenttime = QtCore.QTime.currentTime()
        self.printtimer = self.currenttime.toString("hh:mm:ss")
        self.update
        self.self.ui.remaining_time.display(self.printtimer)


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    c = ControlLCD()
    c.show()
    sys.exit(app.exec_())

Answer 1

我相信我已经解决了下面代码中的关键问题。

我将您的例程合并为一个整体 class 以简化调用。

您的按钮不起作用，因为您需要将它们连接到辅助程序。 例如：

        def onClickStartTimer(self):
            self.timer.start()
...
        self.start_button = QPushButton(set_time)
        self.start_button.clicked.connect(self.onClickStartTimer)

计时器启动和停止控制然后 go 进入适当的帮助程序。

我修改了 updateLCD 以在每次调用时将“当前时间”QTime() 变量递减 1 秒，然后显示时间。 添加测试以在计数器达到零后停止计数器。 还更新了您的 Setzen 按钮帮助程序以调用 updateLCD 来显示您的初始时间设置。

我添加了代码以使暂停在计时器启动和停止之间切换，具体取决于计时器的当前 state，这就是我假设您想要的。

希望这可以帮助。 请参阅以下内容：

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

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

# import StortiTimer
@pyqtSlot() # Enable slots

class Ui_set_time(object):
    

    def onClickStartTimer(self):
        self.timer.start()

    def updateLCD(self): # Subtract 1 sec from currenttime and display it       
        self.currenttime = self.currenttime.addSecs(-1) # Subtract 1 second from currenttime
        self.printtimer = self.currenttime.toString("hh:mm:ss")
        self.remaining_time.display(self.printtimer)

        if self.currenttime == QTime(0,0,0): # Stop after displaying zero seconds.  Place any other needed actions under here when hitting zero.
            self.timer.stop()

    def onClickPauseTimer(self):
        # Toggle between stop and start
        if self.timer.isActive():
            self.timer.stop()
        else:
            self.timer.start()

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

    def onClickKill(self):
        # Don't know what goes in here
        pass
        print("In kill button")
        
    def onClickSetTimer(self):
        self.starttime = self.job_time.time()
        self.currenttime = self.starttime.addSecs(1) # Account for updateLCD subtracting 1
        self.updateLCD() # Subtract 1 sec from currenttime and display this initial time       
    
    def setupUi(self, set_time):
        self.timer = QTimer()
        self.timer.setInterval(1000) # Fire every 1000 ms
        self.timer.timeout.connect(self.updateLCD)
        
        set_time.setObjectName("set_time")
        set_time.resize(1125, 824)

        self.job_time = QTimeEdit(set_time)
        self.job_time.setGeometry(QRect(10, 770, 231, 41))
        self.job_time.setStyleSheet("font: 75 16pt \"MS Shell Dlg 2\";")
        self.job_time.setTime(QTime(0, 0, 0))
        self.job_time.setObjectName("job_time")
        
        self.start_button = QPushButton(set_time)
        self.start_button.setGeometry(QRect(960, 40, 150, 90))
        self.start_button.setStyleSheet("font: 75 22pt \"MS Shell Dlg 2\";\n"
"background-color: rgb(0, 255, 0);")
        self.start_button.setAutoDefault(False)
        self.start_button.setDefault(False)
        self.start_button.setFlat(False)
        self.start_button.setObjectName("start_button")
        self.start_button.clicked.connect(self.onClickStartTimer)
        
        self.pause_button = QPushButton(set_time)
        self.pause_button.setGeometry(QRect(960, 140, 150, 90))
        self.pause_button.setStyleSheet("background-color: rgb(255, 255, 0);\n"
"font: 75 22pt \"MS Shell Dlg 2\";")
        self.pause_button.setObjectName("pause_button")
        self.pause_button.clicked.connect(self.onClickPauseTimer)

        self.finish_button = QPushButton(set_time)
        self.finish_button.setGeometry(QRect(960, 240, 150, 90))
        self.finish_button.setStyleSheet("background-color: rgb(0, 85, 255);\n"
"font: 75 22pt \"MS Shell  2\";\n"
"color: rgb(255, 255, 255);")
        self.finish_button.setObjectName("finish_button")
        self.finish_button.clicked.connect(self.onClickFinish)

        self.label = QLabel(set_time)
        self.label.setGeometry(QRect(10, 720, 231, 40))
        self.label.setFrameShape(QFrame.StyledPanel)
        self.label.setFrameShadow(QFrame.Sunken)
        self.label.setLineWidth(10)
        self.label.setMidLineWidth(10)
        self.label.setObjectName("label")

        self.kill_Button = QPushButton(set_time)
        self.kill_Button.setGeometry(QRect(960, 720, 150, 90))
        self.kill_Button.setObjectName("kill_Button")
        self.kill_Button.clicked.connect(self.onClickKill)

        self.label_2 = QLabel(set_time)
        self.label_2.setGeometry(QRect(260, 720, 261, 40))
        self.label_2.setFrameShape(QFrame.StyledPanel)
        self.label_2.setFrameShadow(QFrame.Sunken)
        self.label_2.setLineWidth(10)
        self.label_2.setMidLineWidth(10)
        self.label_2.setObjectName("label_2")

        self.lineEdit = QLineEdit(set_time)
        self.lineEdit.setGeometry(QRect(260, 770, 261, 41))
        self.lineEdit.setObjectName("lineEdit")

        self.remaining_time = QLCDNumber(set_time)
        self.remaining_time.setGeometry(QRect(0, 50, 911, 221))
        self.remaining_time.setStyleSheet("background-color: rgb(0, 0, 0);\n"
"color: rgb(0, 255, 0);")
        self.remaining_time.setDigitCount(8)
        self.remaining_time.setSegmentStyle(QLCDNumber.Flat)
        self.remaining_time.setObjectName("remaining_time")

        self.label_3 = QLabel(set_time)
        self.label_3.setGeometry(QRect(0, 10, 911, 40))
        self.label_3.setFrameShape(QFrame.StyledPanel)
        self.label_3.setFrameShadow(QFrame.Sunken)
        self.label_3.setLineWidth(10)
        self.label_3.setMidLineWidth(10)
        self.label_3.setObjectName("label_3")

        self.extra_time = QLCDNumber(set_time)
        self.extra_time.setGeometry(QRect(0, 320, 911, 221))
        self.extra_time.setStyleSheet("background-color: rgb(0, 0, 0);\n"
"color: rgb(255, 0, 0);")
        self.extra_time.setDigitCount(8)
        self.extra_time.setSegmentStyle(QLCDNumber.Flat)
        self.extra_time.setObjectName("extra_time")

        self.label_4 = QLabel(set_time)
        self.label_4.setGeometry(QRect(0, 280, 911, 40))
        self.label_4.setFrameShape(QFrame.StyledPanel)
        self.label_4.setFrameShadow(QFrame.Sunken)
        self.label_4.setLineWidth(10)
        self.label_4.setMidLineWidth(10)
        self.label_4.setObjectName("label_4")

        self.set_button = QPushButton(set_time)
        self.set_button.setGeometry(QRect(530, 720, 150, 90))
        self.set_button.setStyleSheet("background-color: rgb(255, 170, 0);\n"
"font: 75 16pt \"MS Shell Dlg 2\";")
        self.set_button.setObjectName("set_button")
        self.set_button.clicked.connect(self.onClickSetTimer)

        self.retranslateUi(set_time)
        # QMetaObject.connectSlotsByName(set_time)

    def retranslateUi(self, set_time):
        _translate = QCoreApplication.translate
        set_time.setWindowTitle(_translate("set_time", "Dialog"))
        self.job_time.setWhatsThis(_translate("set_time", "<html><head/><body><p>Hier die Zeit für den Auftrag eintragen</p><p><br/></p></body></html>"))
        self.job_time.setDisplayFormat(_translate("set_time", "HH:mm:ss"))
        self.start_button.setText(_translate("set_time", "Start"))
        self.pause_button.setText(_translate("set_time", "Pause"))
        self.finish_button.setText(_translate("set_time", "Fertig"))
        self.label.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:14pt; font-weight:600;\">Vorgabe Zeit:</span></p></body></html>"))
        self.kill_Button.setText(_translate("set_time", "Beenden"))

        self.label_2.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:14pt; font-weight:600;\">Auftragsnummer:</span></p><p><br/></p></body></html>"))
        self.label_3.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:16pt; font-weight:600;\">Verbleibende Zeit:</span></p></body></html>"))
        self.label_4.setText(_translate("set_time", "<html><head/><body><p><span style=\" font-size:16pt; font-weight:600;\">Überzogene Zeit:</span></p></body></html>"))

        self.set_button.setText(_translate("set_time", "Setzen"))


if __name__ == "__main__":
    import sys
    app = QApplication(sys.argv)
    set_time = QDialog()
    ui = Ui_set_time()
    ui.setupUi(set_time)
    set_time.show()
    sys.exit(app.exec_())


#Secondly the Control code:


# class ControlLCD(QWidget):
#     def __init__(self, parent = None):
#         QWidget.__init__(self, parent)
#         # self.ui = StortiTimer.Ui_set_time()
#         self.ui.setupUi(self)


#     # def updateLCD(self):
#     #     self.currenttime = QTime.currentTime()
#     #     self.printtimer = self.currenttime.toString("hh:mm:ss")
#     #     self.update
#     #     self.ui.remaining_time.display(self.printtimer)


# if __name__ == "__main__":
#     import sys
#     app = QApplication(sys.argv)
#     c = ControlLCD()
#     c.show()
#     sys.exit(app.exec_())