Python 如何在pyqt pyside中同时运行一个对象的多个实例

在下面的代码中，您可以在每次单击“新建”按钮时打开新选项卡，每个选项卡都包含QWebView浏览器（在PyQt/PySide中使用）和“开始”按钮，当“开始”按钮单击浏览器时，逐个加载3个站点 问题是： 当打开多个选项卡并运行所有选项卡或多个选项卡时，所有其他选项卡将暂停加载，直到最后一个选项卡完成加载，然后继续下一个选项卡 我想同时运行它们如何

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *


class Main_Gui(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        self.bt_new = QPushButton('New')
        self.tabwidget = QTabWidget()
        layout.addWidget(self.tabwidget)
        layout.addWidget(self.bt_new)
        self.setLayout(layout)
        self.bt_new.clicked.connect(self.add_new)

    def add_new(self):
        br = browser()
        self.tabwidget.addTab(br, 'browser')


class browser(QWidget):
    def __init__(self):
        QWidget.__init__(self)
        layout = QVBoxLayout()
        self.br = QWebView()
        self.bt_Start = QPushButton('Start')
        layout.addWidget(self.br)
        layout.addWidget(self.bt_Start)
        self.setLayout(layout)
        self.bt_Start.clicked.connect(self.start_load)

    def start_load(self):
        self.th = QThread()
        self.th.started.connect(self.load)
        self.th.start()

    def load(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/'
            , 'http://www.codecademy.com/tracks/python', 'http://www.google.com']
        for i in sites:
            self.br.load(QUrl(i))
            self.sleep(20)

    def sleep(self, seconds):
        end = QTime.addSecs(QTime.currentTime(), seconds)
        while end > QTime.currentTime():
            QCoreApplication.processEvents()


app = QApplication(sys.argv)
win = Main_Gui()
win.resize(800, 600)
win.show()
sys.exit(app.exec_())

---

您没有为

QThread

s分配任何工作（不要重新实现

run

方法）

browser.load

slot，您已经连接了

th.started

signal，它在主线程中执行（因为您的浏览器是在其中创建的）。这导致了你的问题

此外，您可以仅从主线程更改GUI（例如调用

self.br.load

方法）（为了线程安全）

---

感谢Alexander，他为我在问题中提交的示例提供了线索和完整代码，问题是我想告诉QThread等待页面加载，我找到了一个解决方案，在QThread中创建一个名为loaded的局部变量，并将浏览器loadFinished信号连接到函数，使加载的变量在加载完成时为true，在QThread中，我创建了等待代码，直到loaded var变为true

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *
from Browser_AutoPilot import BrowserAutoPilot


class Main_Gui(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        self.bt_new = QPushButton('New')
        self.tabwidget = QTabWidget()
        layout.addWidget(self.tabwidget)
        layout.addWidget(self.bt_new)
        self.setLayout(layout)
        self.bt_new.clicked.connect(self.add_new)

    def add_new(self):
        br = browser()
        self.tabwidget.addTab(br, 'browser')


class browser(QWidget):
    load_finished = Signal()

    def __init__(self):
        QWidget.__init__(self)
        layout = QVBoxLayout()
        self.br = BrowserAutoPilot()
        self.bt_Start = QPushButton('Start')
        layout.addWidget(self.br)
        layout.addWidget(self.bt_Start)
        self.setLayout(layout)
        self.th = TimerThread()
        self.bt_Start.clicked.connect(self.start_load)

    def start_load(self):
        self.stop_thread(self.th)

        self.th.nextURL.connect(self.load_url_slot)
        self.br.loadFinished.connect(self.wait_loading)
        self.th.start()

    def load_url_slot(self, url):
        self.br.load(QUrl(url))

    def wait_loading(self):
        self.th.loaded = True

    def stop_thread(self, thread):
        thread.terminate()
        if thread.isRunning():
            QCoreApplication.processEvents()

    def sleep(self, seconds):
        end = QTime.addSecs(QTime.currentTime(), seconds)
        while end > QTime.currentTime():
            QCoreApplication.processEvents()


class TimerThread(QThread):
    nextURL = Signal(str)

    def __init__(self, loaded=False):
        QThread.__init__(self)
        self.loaded = loaded

    def run(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/',
                 'http://www.codecademy.com/tracks/python', 'http://www.google.com']

        for url in sites:
            print(self.thread(), url)
            self.nextURL.emit(url)
            self.loaded = False
            while not self.loaded:
                self.sleep(1)

app = QApplication(sys.argv)
win = Main_Gui()
win.resize(800, 600)
win.show()
sys.exit(app.exec_())

---

这很好，但我仍然有一个问题，我想告诉Qthread等待页面加载不是确定的时间，实际上我想知道如何向TimerThread发送通知，webview已完成加载，您可以进行下一个循环迭代并发出第二个信号

import sys
from PySide.QtGui import *
from PySide.QtCore import *
from PySide.QtWebKit import *
from Browser_AutoPilot import BrowserAutoPilot


class Main_Gui(QDialog):
    def __init__(self):
        QDialog.__init__(self)
        layout = QVBoxLayout()
        self.bt_new = QPushButton('New')
        self.tabwidget = QTabWidget()
        layout.addWidget(self.tabwidget)
        layout.addWidget(self.bt_new)
        self.setLayout(layout)
        self.bt_new.clicked.connect(self.add_new)

    def add_new(self):
        br = browser()
        self.tabwidget.addTab(br, 'browser')


class browser(QWidget):
    load_finished = Signal()

    def __init__(self):
        QWidget.__init__(self)
        layout = QVBoxLayout()
        self.br = BrowserAutoPilot()
        self.bt_Start = QPushButton('Start')
        layout.addWidget(self.br)
        layout.addWidget(self.bt_Start)
        self.setLayout(layout)
        self.th = TimerThread()
        self.bt_Start.clicked.connect(self.start_load)

    def start_load(self):
        self.stop_thread(self.th)

        self.th.nextURL.connect(self.load_url_slot)
        self.br.loadFinished.connect(self.wait_loading)
        self.th.start()

    def load_url_slot(self, url):
        self.br.load(QUrl(url))

    def wait_loading(self):
        self.th.loaded = True

    def stop_thread(self, thread):
        thread.terminate()
        if thread.isRunning():
            QCoreApplication.processEvents()

    def sleep(self, seconds):
        end = QTime.addSecs(QTime.currentTime(), seconds)
        while end > QTime.currentTime():
            QCoreApplication.processEvents()


class TimerThread(QThread):
    nextURL = Signal(str)

    def __init__(self, loaded=False):
        QThread.__init__(self)
        self.loaded = loaded

    def run(self):
        sites = ['https://mayaposch.wordpress.com/2011/11/01/how-to-really-truly-use-qthreads-the-full-explanation/',
                 'http://www.codecademy.com/tracks/python', 'http://www.google.com']

        for url in sites:
            print(self.thread(), url)
            self.nextURL.emit(url)
            self.loaded = False
            while not self.loaded:
                self.sleep(1)

app = QApplication(sys.argv)
win = Main_Gui()
win.resize(800, 600)
win.show()
sys.exit(app.exec_())