PyQT从同一文件中的其他类（Qthread）访问UI元素

Question

我也看到过类似的问题，但我的案子没有运气。我正在尝试从其他类访问UI元素，但是我收到以下错误。 “ worker_temp”函数

中的错误

AttributeError: 'rack_temp' object has no attribute 'ui'

我尝试过的代码：-main.py

from PyQt5.uic.properties import QtWidgets
from master.ui_code.fast_charging_ui import Ui_Dialog
from PyQt5.QtWidgets import QMainWindow, QApplication, QDialog, QLabel, QMessageBox
from PyQt5.QtCore import QTimer, QObject, pyqtSignal, QRunnable, pyqtSlot, QThreadPool, QByteArray, QEventLoop, QThread

import sys

class MainWindow(QDialog):

    def __init__(self,*args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.ui = Ui_Dialog()    
        self.ui.setupUi(self)
        self.ui.unit_1.setCurrentIndex(0)
        self.threadpool = QThreadPool()
        self.test = rack_temp()
        self.test.start()


    def door_1_check(self):
        print "door check"

class rack_temp(QThread):
    def __init__(self, parent = None):
        QThread.__init__(self, parent)
        super(rack_temp, self).__init__(parent)
        self.threadpool = QThreadPool()
        self.dataCollectionTimer = QTimer()
        self.dataCollectionTimer.moveToThread(self)
        self.dataCollectionTimer.timeout.connect(self.worker_temp)
        self.worker_temp()

    def worker_temp(self):
        print "test "
        self.ui.unit_1.setCurrentIndex(2)

    def run(self):
        self.dataCollectionTimer.start(2000)
        loop = QEventLoop()
        loop.exec_()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    window.show()
    sys.exit(app.exec_())

谁能告诉我为什么我不能从其他类继承元素？在此先感谢！

Answer 1

我对此有一个解决方案，并且可以正常工作。我们不能直接从不同的线程调用UI元素。我们应该使用信号和插槽机制，或者另一个方法是QMetaObject。我尝试了信号和插槽方法。Examples

class Rack_Temperature(QtCore.QThread):
    slot1 = QtCore.pyqtSignal(list)
    slot2 = QtCore.pyqtSignal(list) 

    def run(self):

        while True:
            try:
                QtCore.QThread.msleep(3000)

                self.slot1.emit("yourdata")
            except Exception as err:
                print err
class MainWindow(QDialog):

    def __init__(self,*args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)

        self.myclass_temp = Rack_Temperature()
        self.myclass_temp.start()
        elf.myclass_temp.slot1.connect(self.test_method)