非主线程（GUI线程）中实现弹窗

目录

一、在非主线程（GUI线程）中实现弹窗

方法：在非主线程中发射槽信号，在主线程进行回应实现，
示例：使用PyQt5写多线程的界面时，在非主线程中实现在界面上弹窗（QMessageBox）

Step 1: 创建界面文件(ui_run_loop_dialog.py)

# -*- coding: utf-8 -*-

from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(640, 504)
        self.gridLayoutWidget = QtWidgets.QWidget(Dialog)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(9, 19, 611, 471))
        self.gridLayoutWidget.setObjectName("gridLayoutWidget")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0)
        self.gridLayout.setObjectName("gridLayout")
        self.pushButton = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.pushButton.setObjectName("pushButton")
        self.gridLayout.addWidget(self.pushButton, 1, 1, 1, 1)
        spacerItem = QtWidgets.QSpacerItem(40, 20, QtWidgets.QSizePolicy.Expanding, QtWidgets.QSizePolicy.Minimum)
        self.gridLayout.addItem(spacerItem, 1, 0, 1, 1)
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.setObjectName("verticalLayout")
        self.label = QtWidgets.QLabel(self.gridLayoutWidget)
        self.label.setObjectName("label")
        self.verticalLayout.addWidget(self.label)
        self.gridLayout.addLayout(self.verticalLayout, 0, 0, 1, 2)

        self.retranslateUi(Dialog)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "非主线程（GUI线程）中实现弹窗"))
        self.pushButton.setText(_translate("Dialog", "打开"))
        self.label.setText(_translate("Dialog", "TextLabel"))

Step 2：代码主体 (run_loop_dialog.py)

import sys
from ui_run_loop_dialog import Ui_Dialog
from PyQt5.QtWidgets import QApplication, QMainWindow, QMessageBox
from PyQt5.QtCore import QThread, pyqtSignal, QTimer
from datetime import datetime


class MinWindow(QMainWindow, Ui_Dialog):
    def __init__(self, parent=None):
        super(MinWindow, self).__init__(parent)
        self.setupUi(self)

        self.time = QTimer()
        self.time.setInterval(1000)
        self.time.timeout.connect(self.refresh)
        self.time.start()

        self.message = Message(self)
        self.message.signal.connect(self.box)
        self.pushButton.clicked.connect(self.message.start)

    def box(self):
        QMessageBox.information(self, '提示', '成功！', QMessageBox.Ok)

    def refresh(self):
        now = datetime.now()
        self.label.setText(str(now))


class Message(QThread):
    signal = pyqtSignal()

    def __init__(self, win):
        super(Message, self).__init__()
        self.window = win

    def run(self):
        self.signal.emit()


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

其中：
（1）MinWindow为主线程，在MinWindow中实例化message线程，其中主线程中实例化一个Label实时显示时间。定义弹窗函数（box）,QMessageBox.information作为示例。
（2）message为附加线程，message的运行由pushbutton控制。
（3）要利用meaasge实现在MinWindow中弹窗，则需要在message中定义信号：

signal = pyqtSignal()

并将这个信号与Window中的函数进行连接：

self.message.signal.connect(self.box)

则运行时将这个信号进行发射即可：

self.signal.emit()

Step 3：效果