PyQT:如何开启新风

Question

首先，类似的问题以前也有人回答过，但这次我需要一些帮助。

我有一个窗口，其中包含一个按钮（Class First），我希望按下后，会出现第二个空白窗口（Class second）。

我修改了从这个问题复制的代码：PyQT on click open new window，然后我编写了这个代码：

# -*- coding: utf-8 -*-

from PyQt4 import QtGui, QtCore
import sys
import design1, design2

class Second(QtGui.QMainWindow, design2.Ui_MainWindow):
    def __init__(self, parent=None):
        super(Second, self).__init__(parent)
        self.setupUi(self)

class First(QtGui.QMainWindow, design1.Ui_MainWindow):
    def __init__(self, parent=None):
        super(First, self).__init__(parent)
        self.setupUi(self)

        self.pushButton.clicked.connect(self.on_pushButton_clicked)
        self.dialog = Second(self)

    def on_pushButton_clicked(self):
        self.dialog.exec_()

def main():
    app = QtGui.QApplication(sys.argv)
    main = First()
    main.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()  

但按下后，出现以下错误消息：

AttributeError: 'Second' object has no attribute 'exec_'

（design1和design2来自Qt设计器。）

任何想法都会很感激的。

Answer 1

我认为您应该使用show方法。

下面是一个工作示例（由您的派生）：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from PyQt4 import QtGui, QtCore
import sys


class Second(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Second, self).__init__(parent)


class First(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(First, self).__init__(parent)
        self.pushButton = QtGui.QPushButton("click me")

        self.setCentralWidget(self.pushButton)

        self.pushButton.clicked.connect(self.on_pushButton_clicked)
        self.dialog = Second(self)

    def on_pushButton_clicked(self):
        self.dialog.show()


def main():
    app = QtGui.QApplication(sys.argv)
    main = First()
    main.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

如果每次单击按钮时都需要一个新窗口，可以更改在the on_pushButton_clicked方法中创建对话框的代码

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from PyQt4 import QtGui, QtCore
import sys


class Second(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Second, self).__init__(parent)


class First(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(First, self).__init__(parent)
        self.pushButton = QtGui.QPushButton("click me")

        self.setCentralWidget(self.pushButton)

        self.pushButton.clicked.connect(self.on_pushButton_clicked)
        self.dialogs = list()

    def on_pushButton_clicked(self):
        dialog = Second(self)
        self.dialogs.append(dialog)
        dialog.show()


def main():
    app = QtGui.QApplication(sys.argv)
    main = First()
    main.show()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()