按下按鈕pyqt5后無法打開新窗口

Question

我學習pyqt5並嘗試通過單擊另一個窗口中的按鈕來打開新窗口。 如果沒有input（）函數，它將立即關閉打開的窗口，所以我放了input（）來保持窗口打開。 該窗口將打開很長時間，但隨后已停止工作。 有人能幫我嗎 ？ 謝謝

import sys
from PyQt5.QtWidgets import QApplication, QPushButton,QMainWindow,QWidget
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot


class App1(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'open window'
        self.left = 60
        self.top = 60
        self.width = 320
        self.height = 200
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        self.show()
        m.getch()
        input()                  '''here is the problem'''

class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 button - pythonspot.com'
        self.left = 200
        self.top = 200
        self.width = 320
        self.height = 200
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        button = QPushButton('PyQt5 button', self)
        button.setToolTip('This is an example button')
        button.move(100, 70)
        button.clicked.connect(self.on_click)

        self.show()

    @pyqtSlot()
    def on_click(self):

        app1 = QApplication(sys.argv)
        ex1 = App1()
        sys.exit(app1.exec_())



if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()
    sys.exit(app.exec_())

Answer 1

您需要保存對窗口的引用，否則在on_click()完成執行時將被垃圾回收。 最簡單的方法是通過使用self將其存儲在App中

@pyqtSlot()
def on_click(self):
    self.ex1 = App1()

Answer 2

import sys
from PyQt5.QtWidgets import QApplication, QPushButton,QMainWindow,QWidget
from PyQt5.QtGui import QIcon
from PyQt5.QtCore import pyqtSlot

class App1(QWidget):

    def __init__(self):
        super().__init__()
        self.title = 'open window'
        self.left = 60
        self.top = 60
        self.width = 320
        self.height = 200
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        self.show()
        input()


class App(QMainWindow):

    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 button - pythonspot.com'
        self.left = 200
        self.top = 200
        self.width = 320
        self.height = 200
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.setGeometry(self.left, self.top, self.width, self.height)

        button = QPushButton('PyQt5 button', self)
        button.setToolTip('This is an example button')
        button.move(100, 70)
        button.clicked.connect(self.on_click)

        self.show()


    @pyqtSlot()
    def on_click(self):
        self.ex1 = App1()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    ex = App()

    sys.exit(app.exec_())