PyQT5之为槽函数传递参数

方法一：lambda表达式传递参数

from PyQt5.QtCore import *
from PyQt5 import QtCore
from PyQt5.QtWidgets import *
import sys


class LambdaSlotArg(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("使用Lambda表达式为槽函数传递参数")
        self.resize(800, 500)
        button1 = QPushButton("按钮1")
        button2 = QPushButton("按钮2")

        layout = QHBoxLayout()
        layout.addWidget(button1)
        layout.addWidget(button2)

        mainFrame = QWidget()
        mainFrame.setLayout(layout)
        self.setCentralWidget(mainFrame)

        button1.clicked.connect(lambda: self.onButtonClick(10, 20))
        button2.clicked.connect(lambda: self.onButtonClick(40, -20))

    def onButtonClick(self, m, n):
        print("m+n=", m+n)
        QMessageBox.information(self, "结果=", str(m+n))


if __name__ == '__main__':

    app = QApplication(sys.argv)
    main_win = LambdaSlotArg()
    main_win.show()
    sys.exit(app.exec_())

方法二：
使用Partial对象为槽函数传递参数

from PyQt5.QtCore import *
from PyQt5 import QtCore
from PyQt5.QtWidgets import *
from functools import partial
import sys


class PartialSlotSlotArg(QMainWindow):

    def __init__(self):
        super().__init__()
        self.setWindowTitle("使用Lambda表达式为槽函数传递参数")
        self.resize(800, 500)
        button1 = QPushButton("按钮1")
        button2 = QPushButton("按钮2")
        x = 20
        y = -123


        layout = QHBoxLayout()
        layout.addWidget(button1)
        layout.addWidget(button2)

        mainFrame = QWidget()
        mainFrame.setLayout(layout)
        self.setCentralWidget(mainFrame)

        # 方法二
        button1.clicked.connect(partial(self.onButtonClick, 10, 20))
        button2.clicked.connect(partial(self.onButtonClick, x, y))

    def onButtonClick(self, m, n):
        print("m+n=", m+n)
        QMessageBox.information(self, "结果=", str(m+n))


if __name__ == '__main__':

    app = QApplication(sys.argv)
    main_win = PartialSlotSlotArg()
    main_win.show()
    sys.exit(app.exec_())