Qtimer并在15秒后关闭申请]]

Question

晚上。我在理解QTimer及其工作方式以及使下面的代码正常工作方面都遇到了一些困难。尽管我讨厌复制/粘贴，但我还是无法弄清楚。目的是将程序运行15秒钟，然后完全退出。其他所有内容都可以正常工作，但是当我尝试集成QTimer来计算经过了多少秒时，无论我尝试哪种变化，它都无能为力或者只是根本不起作用。下面是最新的代码：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QMovie
from PyQt5.QtCore import QTimer
import winsound
import time 
import sys

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(321, 249)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(0, 0, 320, 248))
        self.label.setFrameShape(QtWidgets.QFrame.Box)              
        self.label.setOpenExternalLinks(False)
        self.label.setTextInteractionFlags(QtCore.Qt.NoTextInteraction)
        self.label.setObjectName("label")
        MainWindow.setCentralWidget(self.centralwidget)

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

        #Plays the movie in the Label
        movie = QMovie("giphy.gif")        
        self.label.setMovie(movie)
        movie.start()

        #Plays the sound with the movie
        winsound.PlaySound("magicwrd.wav", winsound.SND_ASYNC|winsound.SND_LOOP)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))


    #Borrowed and modified from here: https://stackoverflow.com/questions/46656634/pyqt5-qtimer-count-until-specific-seconds
    #Goal is to run the application for 15 seconds and then exit out completely. 
    def start_timer(self, slot, count=1, interval=1000):
        counter = 0
        def handler():
            nonlocal counter
            counter += 1
            slot(counter)
            if counter >= count:
                timer.stop()
                timer.deleteLater()
        timer = QtCore.QTimer()
        timer.timeout.connect(handler)
        timer.start(interval)

    def timer_func(self, count):
        if count >= 5:
            sys.exit(app.exec_())


if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    Ui_MainWindow.start_timer(Ui_MainWindow.timer_func, 5)
    app.exec_()

晚上。我在理解QTimer及其工作方式以及使下面的代码正常工作方面都遇到了一些困难。尽管我讨厌复制/粘贴，但我还是无法弄清楚。 ...

Answer 1

如果要在T秒内完成应用程序，则必须使用QTimer::singleShot()，以便在触发该应用程序时调用QCoreApplication::quit()：