Python PySide和进度栏线程

Question

我有以下代码：

from PySide import QtCore, QtGui
import time

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(400, 133)
        self.progressBar = QtGui.QProgressBar(Dialog)
        self.progressBar.setGeometry(QtCore.QRect(20, 10, 361, 23))
        self.progressBar.setProperty("value", 24)
        self.progressBar.setObjectName("progressBar")
        self.pushButton = QtGui.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(20, 40, 361, 61))
        self.pushButton.setObjectName("pushButton")

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

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "PushButton", None, QtGui.QApplication.UnicodeUTF8))
        self.progressBar.setValue(0)
        self.pushButton.clicked.connect(self.progress)

    def progress(self):
        self.progressBar.minimum = 1
        self.progressBar.maximum = 100
        for i in range(1, 101):
            self.progressBar.setValue(i)
            time.sleep(0.1)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

我希望进度条位于单独的线程中，因此它不会冻结应用程序，但是我似乎找不到解决方法。

谁能帮忙吗？

Answer 1

我认为您可能会误会。您需要在单独的线程中进行工作，以免冻结应用程序。但是您还希望能够更新进度条。您可以通过使用创建工作人员类来实现此目的QThread。QThread能够发出信号，您的UI可以侦听并采取适当的行动。

首先，让我们创建您的worker类。

#Inherit from QThread
class Worker(QtCore.QThread):

    #This is the signal that will be emitted during the processing.
    #By including int as an argument, it lets the signal know to expect
    #an integer argument when emitting.
    updateProgress = QtCore.Signal(int)

    #You can do any extra things in this init you need, but for this example
    #nothing else needs to be done expect call the super's init
    def __init__(self):
        QtCore.QThread.__init__(self)

    #A QThread is run by calling it's start() function, which calls this run()
    #function in it's own "thread". 
    def run(self):
        #Notice this is the same thing you were doing in your progress() function
        for i in range(1, 101):
            #Emit the signal so it can be received on the UI side.
            self.updateProgress.emit(i)
            time.sleep(0.1)

因此，既然您拥有一个工人阶级，就该利用它了。您将需要在您的Ui_Dialog类中创建一个新函数来处理发出的信号。

def setProgress(self, progress):
    self.progressBar.setValue(progress)

在那里，您可以删除progress()功能。

在retranslateUi()您将要更新按钮事件处理程序从

self.pushButton.clicked.connect(self.progress)

至

self.pushButton.clicked.connect(self.worker.start)

最后，在您的setupUI()函数中，您将需要创建worker类的实例，并将其信号连接到setProgress()函数。

在这之前：

self.retranslateUi(Dialog)

添加：

self.worker = Worker()
self.worker.updateProgress.connect(self.setProgress)

这是最终代码：

from PySide import QtCore, QtGui
import time


class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.resize(400, 133)
        self.progressBar = QtGui.QProgressBar(Dialog)
        self.progressBar.setGeometry(QtCore.QRect(20, 10, 361, 23))
        self.progressBar.setProperty("value", 24)
        self.progressBar.setObjectName("progressBar")
        self.pushButton = QtGui.QPushButton(Dialog)
        self.pushButton.setGeometry(QtCore.QRect(20, 40, 361, 61))
        self.pushButton.setObjectName("pushButton")

        self.worker = Worker()
        self.worker.updateProgress.connect(self.setProgress)

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

        self.progressBar.minimum = 1
        self.progressBar.maximum = 100

    def retranslateUi(self, Dialog):
        Dialog.setWindowTitle(QtGui.QApplication.translate("Dialog", "Dialog", None, QtGui.QApplication.UnicodeUTF8))
        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "PushButton", None, QtGui.QApplication.UnicodeUTF8))
        self.progressBar.setValue(0)
        self.pushButton.clicked.connect(self.worker.start)

    def setProgress(self, progress):
        self.progressBar.setValue(progress)

#Inherit from QThread
class Worker(QtCore.QThread):

    #This is the signal that will be emitted during the processing.
    #By including int as an argument, it lets the signal know to expect
    #an integer argument when emitting.
    updateProgress = QtCore.Signal(int)

    #You can do any extra things in this init you need, but for this example
    #nothing else needs to be done expect call the super's init
    def __init__(self):
        QtCore.QThread.__init__(self)

    #A QThread is run by calling it's start() function, which calls this run()
    #function in it's own "thread". 
    def run(self):
        #Notice this is the same thing you were doing in your progress() function
        for i in range(1, 101):
            #Emit the signal so it can be received on the UI side.
            self.updateProgress.emit(i)
            time.sleep(0.1)

if __name__ == "__main__":
    import sys
    app = QtGui.QApplication(sys.argv)
    Dialog = QtGui.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

QThreads具有一些内置信号，这些信号会自动发出。您可以在文档中看到它们以及有关QThreads的更多信息。