Python PySide和进度栏线程

Python PySide和进度栏线程

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 QThreadclass 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)

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这是最终代码：

from PySide import QtCore, QtGuiimport timeclass 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.UnipreUTF8))        self.pushButton.setText(QtGui.QApplication.translate("Dialog", "PushButton", None, QtGui.QApplication.UnipreUTF8))        self.progressBar.setValue(0)        self.pushButton.clicked.connect(self.worker.start)    def setProgress(self, progress):        self.progressBar.setValue(progress)#Inherit from QThreadclass 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_())

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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。