PyQt 窗口不显示 [英] PyQt Window No Show

问题描述

在 simple 上调用 show 方法时，简单窗口不显示.为什么我的简单窗口不显示.:(

Upon calling the show method on simple the simple window does not show. Why doesn't my Simple window show. :(

import sys
from PyQt4 import QtGui


class Widget(QtGui.QWidget):

    def __init__(self):
        super(Widget, self).__init__()
        simple = Simple()

        button = QtGui.QPushButton("Button", self)
        button.clicked.connect(simple.show)
        self.show()


class Simple(QtGui.QWidget):

    def __init__(self):
        super(Simple, self).__init__()
        self.setGeometry(300, 250, 250, 150)
        self.setWindowTitle("Simple Widget")


if __name__ =="__main__":
    app = QtGui.QApplication(sys.argv)
    widget = Widget()
    sys.exit(app.exec_())

请帮忙！

推荐答案

你的代码的问题在于，__init__ 类的Widget方法中的simple/code> 是一个局部变量，所以一旦 __init__ 方法执行完毕，simple 对象就会被 python Garbage Collector 销毁，因此该窗口不会出现，因为该对象不存在于内存中.要解决您的问题，只需在 simple 变量的开头添加 self 使其成为成员变量.

The problem with your code is that, simple in __init__ method of class Widget is a local variable, so as soon as the __init__ method finishes execution, the simple object is destroyed by the python Garbage Collector, thus the window does not appear because the object does not exist in the memory. To solve your problem, just add self at the starting of the simple variable to make it member variable.

...
self.simple = Simple()
button = QtGui.QPushButton("Button", self)
button.clicked.connect(self.simple.show)
...

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