我在qtdesigner中设计了一个表单。它具有“开”和“关”按钮。开按钮应该开始闪烁，而关按钮应该停止它。因此，如果time.sleep持续时间很短，那没有问题，但是当我写10秒钟的睡眠时，当我单击关闭按钮时它不会立即停止。程序等待10秒以停止Led闪烁。那么如何中断time.sleep？
import time
import threading
import RPi.GPIO as GPIO
import sys
from time import sleep
from PyQt5.QtWidgets import QMainWindow, QPushButton, QApplication, QLabel
from PyQt5 import QtCore, QtGui, QtWidgets
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)
switch = True
def blink(self):
def run():
while (switch == True):
print('BLINK...BLINK...')
GPIO.output(17, GPIO.HIGH)
time.sleep(10.0)
GPIO.output(17, GPIO.LOW)
time.sleep(10.0)
if switch == False:
break
thread = threading.Thread(target=run)
thread.start()
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(400, 300)
self.pshbttn1 = QtWidgets.QPushButton(Form)
self.pshbttn1.setGeometry(QtCore.QRect(60, 170, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn1.setFont(font)
self.pshbttn1.setObjectName("pshbttn1")
self.pshbttn1.clicked.connect(self.switchon)
self.pshbttn2 = QtWidgets.QPushButton(Form)
self.pshbttn2.setGeometry(QtCore.QRect(220, 170, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn2.setFont(font)
self.pshbttn2.setObjectName("pshbttn2")
self.pshbttn2.clicked.connect(self.switchoff)
self.pshbttn3 = QtWidgets.QPushButton(Form)
self.pshbttn3.setGeometry(QtCore.QRect(140, 230, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn3.setFont(font)
self.pshbttn3.setObjectName("pshbttn3")
self.pshbttn3.clicked.connect(app.exit)
self.label = QtWidgets.QLabel(Form)
self.label.setGeometry(QtCore.QRect(80, 80, 251, 51))
font = QtGui.QFont()
font.setPointSize(12)
self.label.setFont(font)
self.label.setObjectName("label")
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "LED"))
self.pshbttn1.setText(_translate("Form", "ON"))
self.pshbttn2.setText(_translate("Form", "OFF"))
self.pshbttn3.setText(_translate("Form", "EXIT"))
self.label.setText(_translate("Form", "LED\'i açmak için butonları kullanın"))
def switchon(self):
global switch
switch = True
print ('switch on')
blink(self)
def switchoff(self):
print ('switch off')
global switch
switch = False
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_Form()
ui.setupUi(MainWindow)
MainWindow.show()
sys.exit(app.exec_())
答案 0 :(得分：1)
在这种情况下，不必使用睡眠，只需使用QTimer。为了简化任务，我创建了一个处理销钉的类。此外，PyQt5建议不要修改Qt Designer生成的类。
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
import RPi.GPIO as GPIO
class Led:
def __init__(self, pin, timeout=1000):
self._state = False
self._pin = pin
self._timeout = timeout
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(self.pin, GPIO.OUT)
self.blink_timer = QtCore.QTimer(
interval=self.timeout, timeout=self._on_blink_timeout
)
def _on_blink_timeout(self):
self.state = not self.state
def _update_internal_state(self):
GPIO.output(self.pin, GPIO.HIGH if self._state else GPIO.LOW)
@property
def pin(self):
return self._pin
@property
def timeout(self):
return self._timeout
@timeout.setter
def timeout(self, v):
self._timeout = v
is_active = self.blink_timer.isActive()
self.blink_timer.setInterval(self.timeout)
if is_active:
self.blink_timer.start()
def on(self):
self.state = True
def off(self):
self.state = False
@property
def state(self):
return self._state
@state.setter
def state(self, s):
self._state = s
self._update_internal_state()
def start(self):
self.state = True
self.blink_timer.start()
def stop(self):
self.state = False
self.blink_timer.stop()
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(400, 300)
self.pshbttn1 = QtWidgets.QPushButton(Form)
self.pshbttn1.setGeometry(QtCore.QRect(60, 170, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn1.setFont(font)
self.pshbttn1.setObjectName("pshbttn1")
self.pshbttn2 = QtWidgets.QPushButton(Form)
self.pshbttn2.setGeometry(QtCore.QRect(220, 170, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn2.setFont(font)
self.pshbttn2.setObjectName("pshbttn2")
self.pshbttn3 = QtWidgets.QPushButton(Form)
self.pshbttn3.setGeometry(QtCore.QRect(140, 230, 125, 50))
font = QtGui.QFont()
font.setPointSize(16)
font.setBold(True)
font.setWeight(75)
self.pshbttn3.setFont(font)
self.pshbttn3.setObjectName("pshbttn3")
self.pshbttn3.clicked.connect(app.exit)
self.label = QtWidgets.QLabel(Form)
self.label.setGeometry(QtCore.QRect(80, 80, 251, 51))
font = QtGui.QFont()
font.setPointSize(12)
self.label.setFont(font)
self.label.setObjectName("label")
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "LED"))
self.pshbttn1.setText(_translate("Form", "ON"))
self.pshbttn2.setText(_translate("Form", "OFF"))
self.pshbttn3.setText(_translate("Form", "EXIT"))
self.label.setText(_translate("Form", "LED'i açmak için butonları kullanın"))
class Widget(QtWidgets.QWidget, Ui_Form):
def __init__(self, parent=None):
super(Widget, self).__init__(parent)
self.setupUi(self)
self.led = Led(17, timeout=10000)
self.pshbttn1.clicked.connect(self.led.start)
self.pshbttn2.clicked.connect(self.led.stop)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())