我正在尝试将代码从 PyQt4 移植到 PyQt5,但不明白为什么以下内容不起作用。该插槽未被调用。我看到一堆蜱虫,但没有看到蜱虫。我错过了什么?
from PyQt5 import QtCore
import time
# expect to see ticks & tocks
class Alarm(QtCore.QThread, QtCore.QObject):
signal = QtCore.pyqtSignal()
def __init__(self, parent=None):
super(Alarm, self).__init__(parent)
self.signal.connect(self.eventp)
self.start()
def run(self):
while True:
print('tick')
self.signal.emit()
time.sleep(1)
@QtCore.pyqtSlot()
def eventp(self):
print('Tock')
# main
alarm = Alarm()
time.sleep(6) # wait for countdown, then terminate
首先QThread已经继承自QObject,因此没有必要将其用作接口。另一方面,QThread 必须存在于事件循环中,因为这就是允许传输信号的原因,例如,在您的情况下,您使用 time.sleep(6) 阻止事件循环,而不是如果您想在之后完成循环使用 QTimer 6 秒:
import time
from PyQt5 import QtCore
# expect to see ticks & tocks
class Alarm(QtCore.QThread):
signal = QtCore.pyqtSignal()
def __init__(self, parent=None):
super(Alarm, self).__init__(parent)
self.signal.connect(self.eventp)
self.start()
def run(self):
while True:
print('tick')
self.signal.emit()
time.sleep(1)
@QtCore.pyqtSlot()
def eventp(self):
print('Tock')
if __name__ == '__main__':
import sys
app = QtCore.QCoreApplication(sys.argv)
alarm = Alarm()
QtCore.QTimer.singleShot(6*1000, QtCore.QCoreApplication.quit)
sys.exit(app.exec_())
子类化 QThread 不是不好的做法吗?,我记得官方文档是这么说的。