我创建的页面会立即打开和关闭

时间:2019-05-17 08:28:11

标签: python pyqt5 qwidget

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错吗?

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_())

1 个答案:

答案 0 :(得分:2)

只需将您的open_second_screen更改为此:

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

(当然,还要从另一个类中删除self.show())

这是PyQt的一个经常出现的问题。如果新窗口未存储在变量中,则将对其进行垃圾回收;除非函数将second_window存储为窗口实例的参数,否则它将{{1}}删除。