我创建的页面将立即打开并关闭

Question

我想在按下按钮时打开第二个窗口。窗口打开并立即关闭。有人知道我在做什么吗？

这是我的代码：

import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import QMainWindow, QPushButton, QLabel, QApplication
class FirstWindow(QMainWindow):
    def __init__(self):
        super(FirstWindow, self).__init__()
        self.setGeometry(50, 50, 500, 300)
        self.setWindowTitle('It's working!')
        self.initUI()
    def initUI(self):
        second_screen_btn = QPushButton('Open second screen', self)
        second_screen_btn.setGeometry(250, 100, 100, 100)
        second_screen_btn.clicked.connect(self.open_second_screen)
        self.show()
    def open_second_screen(self):
        second_window = SecondWindow()
class SecondWindow(QMainWindow):
    def __init__(self):
        super(SecondWindow, self).__init__()
        self.setGeometry(100, 100, 500, 300)
        self.setWindowTitle('This is a second window')
        self.initUI()
    def initUI(self):
        self.show()
if __name__ == '__main__':
    app = QApplication(sys.argv)
    gui = FirstWindow()
    sys.exit(app.exec_())

Answer 1

只需将您的open_second_screen更改为：

def open_second_screen(self):
    self.second_window = SecondWindow()
    self.second_window.show()

(当然，从其他类中删除self.show(((

这是PYQT的可再生问题。如果不存储在变量中，则收集新窗口，并且当功能结束时删除second_window变量，除非您将其存储为窗口实例的参数。