终止 PyQt 应用程序

Question

如果用户与应用程序交互，例如按下按钮，然后用户单击 X 按钮，应用程序将保留运行，但 window 会关闭。我怎样才能完全终止应用程序。它是使用 PyQt5 构建的。

Answer 1

这是一个简单的 "Hello World" 示例，我从 Qt 教程中复制而来。它使用 sys.exit(...) 退出应用程序。

import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QLabel, QGridLayout, QWidget
from PyQt5.QtCore import QSize    

class HelloWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)

        self.setMinimumSize(QSize(640, 480))    
        self.setWindowTitle("Hello world") 

        centralWidget = QWidget(self)          
        self.setCentralWidget(centralWidget)   

        gridLayout = QGridLayout(self)     
        centralWidget.setLayout(gridLayout)  

        title = QLabel("Hello World from PyQt", self) 
        title.setAlignment(QtCore.Qt.AlignCenter) 
        gridLayout.addWidget(title, 0, 0)

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

Answer 2

试一试：

import sys
from PyQt5.QtWidgets import (QMainWindow, QLabel, QGridLayout, qApp,
                             QApplication, QWidget, QPushButton)
from PyQt5.QtCore import QSize, Qt   

class HelloWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("Hello world") 

        centralWidget = QWidget()          
        self.setCentralWidget(centralWidget)   

        title = QLabel("Hello World from PyQt") 
        title.setAlignment(Qt.AlignCenter) 

        button = QPushButton("Quit")
        button.clicked.connect(qApp.quit)            # <---

        gridLayout = QGridLayout(centralWidget)          
        gridLayout.addWidget(title,  0, 0)
        gridLayout.addWidget(button, 1, 0)

if __name__ == "__main__":
    app = QApplication(sys.argv)
    mainWin = HelloWindow()
    mainWin.show()
    sys.exit( app.exec_() )

终止 PyQt 应用程序

Terminate PyQt Application

python

pyqt

pyqt5

exit

qtgui