您必须在实现或继承的类中声明新信号；
class ZeroSpinBox (QSpinBox): atzero = Signal(int) . .
然后，您可以使用新型信号来调用它。用于发射信号；
self.emit(SIGNAL("atzero(int)"), self.zeros)改成
self.atzero.emit(self.zeros)
用于连接信号；
self.connect(zerospinbox, SIGNAL("atzero(int)"), self.announce)改成
zerospinbox.atzero.connect(self.announce)
您也可以阅读本文档以了解更多信息。
实施代码示例（PyQt4也与PySide相同，不同的是名称
Signal＆
pyqtSignal）；
import sysfrom PyQt4.QtCore import *from PyQt4.QtGui import *class ZeroSpinBox(QSpinBox): atzero = pyqtSignal(int) zeros = 0 def __init__(self): super(ZeroSpinBox, self).__init__() self.valueChanged.connect(self.checkzero) def checkzero(self): if self.value() == 0: self.zeros += 1# self.emit(SIGNAL("atzero(int)"), self.zeros) self.atzero.emit(self.zeros)class Form(QDialog): def __init__(self): super(Form, self).__init__() dial = QDial() dial.setNotchesVisible(True) zerospinbox = ZeroSpinBox() layout = QHBoxLayout() layout.addWidget(dial) layout.addWidget(zerospinbox) self.setLayout(layout) dial.valueChanged.connect(zerospinbox.setValue) zerospinbox.valueChanged.connect(dial.setValue) zerospinbox.atzero.connect(self.announce)# self.connect(zerospinbox, SIGNAL("atzero(int)"), self.announce) self.setWindowTitle("Signals") def announce(self, zeros): print("zerospinbox has been at zero " + str(zeros) + " times.")app = QApplication(sys.argv)form = Form()form.show()app.exec_()
