Question

使用sys.argv而不是命令行上的输入标志，我想更改我的python程序，以便带有对话框的GUI允许用户提供一些问题的答案。按下“apply”按钮后，我希望对话框GUI消失，然后使用对话框中提供的变量使代码正常运行。我尝试了很多使用QtGui的方法。它崩溃了，或者主程序的答案都不清楚。下面我展示了我的许多尝试之一。在此示例中，按下“应用”按钮后，答案未知。输出是

after widget answer1 = <blank no matter what I write in the dialog box>

我非常感谢有关如何更改此代码的帮助，以便变量“a1”填充对话框中给出的字符串。谢谢！

import sys
from PyQt4 import QtGui

class Widget(QtGui.QWidget):

    def __init__(self):
        super(Widget, self).__init__()

        self.answer1 = QtGui.QLabel()
        q1Edit = QtGui.QLineEdit()
        q1Edit.textChanged[str].connect(self.q1Changed)

        grid = QtGui.QGridLayout()
        grid.setSpacing(20)

        grid.addWidget(QtGui.QLabel('Question 1'), 1, 0)
        grid.addWidget(q1Edit, 1, 1)
        grid.addWidget(self.answer1, 1, 2)

        applyBtn = QtGui.QPushButton('Apply', self)
        applyBtn.clicked.connect(self.close)

        self.answer1Text = self.answer1.text()

        grid.addWidget(applyBtn,4,3)

        self.setLayout(grid)     

        self.setGeometry(300, 300, 350, 300)
        self.show()


    def q1Changed(self, text):
        self.answer1.setText(text)

    def returnAnswer1(self):
        return self.answer1Text


def main():    
    app = QtGui.QApplication(sys.argv)
    w = Widget() 
    a1 = w.returnAnswer1()
    print("after widget answer1 = " + a1)    
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

感谢JRazor，这最终是解决方案：

import sys
from PyQt4 import QtGui

class Widget(QtGui.QDialog):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

        self.answer1 = QtGui.QLabel()
        q1Edit = QtGui.QLineEdit()
        q1Edit.textChanged.connect(self.q1Changed)

        self.answer2 = QtGui.QLabel()
        q2Edit = QtGui.QLineEdit()
        q2Edit.textChanged.connect(self.q2Changed)

        grid = QtGui.QGridLayout()
        grid.setSpacing(20)

        grid.addWidget(QtGui.QLabel('Question 1'), 1, 0)
        grid.addWidget(q1Edit, 1, 1)

        grid.addWidget(QtGui.QLabel('Question 2'), 2, 0)
        grid.addWidget(q2Edit, 2, 1)

        applyBtn = QtGui.QPushButton('Apply', self)
        applyBtn.clicked.connect(self.close)

        grid.addWidget(applyBtn,3,2)
        self.setLayout(grid)
        self.setGeometry(300, 300, 350, 300)

    def q1Changed(self, text):
        self.answer1.setText(text)

    def q2Changed(self, text):
        self.answer2.setText(text)

    def returnAnswer1(self):
        return self.answer1.text()

    def returnAnswer2(self):
        return self.answer2.text()

    @staticmethod
    def getData(parent=None):
        dialog = Widget(parent)
        dialog.exec_()
        return [dialog.returnAnswer1(), dialog.returnAnswer2()]

def main():
    app = QtGui.QApplication([])
    window = Widget()
    data = window.getData()
    print data[0]
    print data[1]


if __name__ == '__main__':
    main()

Answer 1

您需要将QWidget更改为QDialog：

class Widget(QtGui.QDialog):
    def __init__(self, parent=None):
        super(Widget, self).__init__(parent)

然后使用静态方法为class Widget创建一个函数。函数将获取对话框窗口的父级并从编辑字段返回文本：

@staticmethod
def getData(parent = None):
    dialog = Widget(parent)
    dialog.exec_()
    return dialog.returnAnswer1()

然后通过传递值来调用窗口：

def main():
    app = QtGui.QApplication([])
    window = Widget()
    print window.getData()  # window is value from edit field

此外，您需要从课程中删除self.show()。

完整代码：https://gist.github.com/gitex/83b06e8ceaac18ad5dec2d332ed6cbaa

如何在PyQt4中使用QtGui来收集python程序的输入变量？

1 个答案: