PyQt5 & PySide2信号与槽机制1

pyside2&pyqt5的信号与槽机制

1、信号与槽的两种写法

第一种情况：

from PySide2 import QtWidgets, QtCore

import sys

if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)

    widget = QtWidgets.QWidget()

    btn = QtWidgets.QPushButton(widget)

    btn.clicked.connect(widget.close)

    widget.show()

    sys.exit(app.exec_())

第二种情况：

from PySide2 import QtWidgets, QtCore

import sys

if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)

    widget = QtWidgets.QWidget()

    btn = QtWidgets.QPushButton(widget)

    QtCore.QObject.connect(btn,QtCore.SIGNAL("clicked()"),widget,QtCore.SLOT("close()"))

    widget.show()

    sys.exit(app.exec_())

2、自定义槽函数

from PySide2 import QtWidgets, QtCore

import sys

if __name__ == "__main__":

    app = QtWidgets.QApplication(sys.argv)

    widget = QtWidgets.QWidget()

    btn = QtWidgets.QPushButton(widget)

    @QtCore.Slot()

    def changeTex():

        btn.setText("ok")

    btn.clicked.connect(changeTex)

    widget.show()

    sys.exit(app.exec_())

3、带参数槽函数

（1）lambad写法：

from PySide2 import QtWidgets,QtCore

import sys

class MyForm(QtWidgets.QWidget):

    def __init__(self, parent=None):

        super(MyForm, self).__init__(parent)

        button1 = QtWidgets.QPushButton(self)

        button1.clicked.connect(lambda: self.on_button(1))

    def on_button(self, n):

        print('Button {0} clicked'.format(n))  

if __name__ == "__main__":

    import sys

    app = QtWidgets.QApplication(sys.argv)

    form = MyForm()

    form.show()

    app.exec_()

（2）使用functools里的partial函数。

from functools import partial

from PySide2 import QtWidgets,QtCore

import sys

class MyForm(QtWidgets.QWidget):

    def __init__(self, parent=None):

        super(MyForm, self).__init__(parent)

        button1 = QtWidgets.QPushButton(self)

        button1.clicked.connect(partial(self.on_button, 1))

    def on_button(self, n):

        print('Button {0} clicked'.format(n))  

if __name__ == "__main__":

    import sys

    app = QtWidgets.QApplication(sys.argv)

    form = MyForm()

    form.show()

    app.exec_()

巴特西

PyQt5 & PySide2信号与槽机制1

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