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Anonumous1245
Asked:2025-01-09 00:08:27 +0000 UTC2025-01-09 00:08:27 +0000 UTC

为什么 Slot() 不能捕获 Signal 值？

  • 772

有一段代码：

from PySide6 import QtCore
from PySide6 import QtWidgets


class Sender(QtWidgets.QMainWindow):
    signal = QtCore.Signal(int)
    def __init__(self):
        super().__init__()
    
    def Emmit(self):
        self.signal.emit(666)


class Recivier(QtWidgets.QWidget):
    def __init__(self,):
        super().__init__()

   @QtCore.Slot(int)
    def recive(self, value):
        print(value)


app = QtWidgets.QApplication([])
sen = Sender()
rec = Recivier()
sen.signal.connect(Recivier.recive)
sen.Emmit()
app.exec()

当尝试输出传递的值时，出现错误：

类型错误：Recivier.recive() 缺少 1 个必需的位置参数：“值”

这是它的工作原理吗？如果不是，它实际上是如何工作的以及在哪里讨论过？

python

1 个回答

  1. Best Answer

    信号和槽

    信号和槽

    对信号和槽的支持

    主要.py：

    import sys
'''
from PySide6 import QtCore, QtWidgets, QtGui
'''
from PyQt5 import QtCore, QtWidgets, QtGui


class Sender(QtWidgets.QMainWindow):
#    signal = QtCore.Signal(int)                  # PySide6       # 1
    signal = QtCore.pyqtSignal(int)               # PyQt5

    def __init__(self):
        super().__init__()
    
    def emmit(self):
        self.signal.emit(777)                                     # 3


class Recivier(QtWidgets.QWidget):
    def __init__(self, parent=None):
        super(Recivier, self).__init__(parent)

#   @QtCore.Slot(int)                             # PySide6
    @QtCore.pyqtSlot(int)                         # PyQt5
    def recive(self, value):                                      # 4
        print(f'value = {value}')
        self.window().label.setText(f'{value}')


class MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.centralWidget = QtWidgets.QWidget()
        self.setCentralWidget(self.centralWidget)
        
        self.label = QtWidgets.QLabel(
            'Через 3 секунды сработает сигнал', 
            alignment = QtCore.Qt.AlignCenter)
        font = QtGui.QFont("Times New Roman", 24)
        self.label.setFont(font)
        
        self.layout = QtWidgets.QVBoxLayout(self.centralWidget)
        self.layout.addWidget(self.label)
        
        self.recivier = Recivier(self)
        
        self.sender = Sender()
        self.sender.signal.connect(self.recivier.recive)          # 2
        
        QtCore.QTimer.singleShot(3000, self.sender.emmit)


if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    w = MainWindow()
    w.resize(640, 480)
    w.show()
    sys.exit(app.exec())

    在此输入图像描述

    • 0

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