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如何在长期任务上更改 QPushButton 的文本, 并在任务完成后更改?
原标题:Howto change text of QPushButton on long-running task, and change back when task done?

我有一些这样的代码:

class MyApp(Ui_MainWindow):
    def __init__(self):
        pass

    def setupUi(self, *args):
        super(MyApp, self).setupUi(*args)
        QtCore.QObject.connect(self.pushButton, QtCore.SIGNAL(_fromUtf8("clicked()")), self.doCheck)

    def doCheck(self):
        self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "Checking...", None, QtGui.QApplication.UnicodeUTF8))
        # Code to do real checking here... (it s a network app)
        # When check done, display result in a "QTextBrowser" 
        # ....
        # Change text of Button to "Done!"
        self.pushButton.setText(QtGui.QApplication.translate("MainWindow", "Done!", None, QtGui.QApplication.UnicodeUTF8))

But the result not as I expect. My app do network checking and display result ok, but the button did not change text to "Checking..." when the check begin; it s only change text to "Done!" when everything is finished!

最佳回答

在更改按钮标签后, 您应该运行 以使用新标签更新 UI 。

请注意, 您的 UI 将会在长期任务运行期间被冻结 。 为避免这种情况, 您有时在长期操作中有时会调用 < code_ application::: processEvents () , 或者在单独的 < code_ Thread 中运行此操作 。

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