python - 在PyQt中创建和使用用户定义的广告位

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

import sys
from PyQt4 import QtGui, QtCore

class Example(QtGui.QMainWindow):
    def __init__(self):
        super(Example, self).__init__();
        self.initUI()


    def initUI(self):
        field = QtGui.QLineEdit("", self)
        field.resize(field.sizeHint())
        field.move(150, 100)

        submit_button = QtGui.QPushButton("Fill hello world", self)
        submit_button.resize(submit_button.sizeHint())
        submit_button.move(50,300)
        submit_button.clicked.connect(self.modify(field))


    def modify(self, field):
        field.setText("hello")

def main():    #!/usr/bin/python
# -*- coding: utf-8 -*-

import sys
from PyQt4 import QtGui, QtCore

class Example(QtGui.QMainWindow):
    def __init__(self):
        super(Example, self).__init__();
        self.initUI()


    def initUI(self):
        field = QtGui.QLineEdit("", self)
        field.resize(field.sizeHint())
        field.move(150, 100)

        submit_button = QtGui.QPushButton("Fill hello world", self)
        submit_button.resize(submit_button.sizeHint())
        submit_button.move(50,300)
        submit_button.clicked.connect(self.modify(field))


    def modify(self, field):
        field.setText("hello")


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

if __name__=='__main__':
    main()

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    ex.show()
    sys.exit(app.exec_())

if __name__=='__main__':
    main()

好。所以这就是我想要做的。每当单击sumbit按钮时，我希望该字段由“ hello world”填充。
这意味着将提交按钮连接到用户定义的插槽。如何将字段传递给Modify（）函数，在该函数中可以更改其文本？

目前，代码给出了错误：

     File "test.py", line 21, in initUI
    submit_button.clicked.connect(self.modify(field))
TypeError: connect() slot argument should be a callable or a signal, not 'NoneType'

最佳答案

首先，您从connect()收到错误消息，因为您没有传递函数作为参数，而是传递了函数调用的结果，即None。该行应写为：

submit_button.clicked.connect(self.modify)

然后，应更改修改功能以了解要填充的字段。实现此目的的一种方法是将字段保留在类变量中，并在其前面加上self.：

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

import sys
from PyQt4 import QtGui, QtCore

class Example(QtGui.QMainWindow):
    def __init__(self):
        super(Example, self).__init__();
        self.initUI()


    def initUI(self):
        self.field = QtGui.QLineEdit("", self)
        self.field.resize(self.field.sizeHint())
        self.field.move(150, 100)

        submit_button = QtGui.QPushButton("Fill hello world", self)
        submit_button.resize(submit_button.sizeHint())
        submit_button.move(50,300)
        submit_button.clicked.connect(self.modify)


    def modify(self):
        self.field.setText("hello")


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

if __name__=='__main__':
    main()