QThread ：Destroyed while thread is still running

程序运行报错：QThread ：Destroyed while thread is still running

pyqt在ui界面中，查db的大量数据会卡顿
用，必须用QThread解决
今天运行界面报错：QThread ：Destroyed while thread is still running

解决方案：
self.
exec()

pyqt真呵呵…

pyqt多线程模块导入

from PyQt5.QtCore import Qt, QThread, pyqtSignal
# 控件的导入
from PyQt5.QtWidgets import QMessageBox, QCompleter

在主线程中：
1.实例化为实力参数self.
2.加exec()保护线程
3.代码不全，这是主线程中调用多线程的代码

        self.symbol_thread = GetSymbolListThread()
        self.symbol_thread.start()
        self.symbol_thread.exec()
        self.symbol_thread.bardata_signal.connect(self.emitbardata)

主线程中接受多线程传值的控件逻辑实现

    def emitbardata(self, symbol_list: list):
        self.completer = QCompleter(symbol_list)
        self.completer.setFilterMode(Qt.MatchContains)
        self.completer.setCompletionMode(QCompleter.PopupCompletion)
        self.symbol_line.setCompleter(self.completer)

多线程读取数据库代码实现

class GetSymbolListThread(QThread):
    bardata_signal = pyqtSignal(list)

    def __init__(self):
        super(GetSymbolListThread, self).__init__()
    #必须交run，内部实现叫run，重写也要叫run
    def run(self):
        baroverview = database_manager.get_bar_overview()
        vt_symbol_set = set()
        for item in baroverview:
            vt_symbol = f'{item.symbol}.{item.exchange.value}'
            vt_symbol_set.add(vt_symbol)
        symbol_list = list(vt_symbol_set)
        self.bardata_signal.emit(symbol_list)