Python pyQt：如何更新标签？
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pyQt: How do I update a label?
提问by T.T.
I created this simple UI with qtDesigner and I want to update my label every 10 seconds with the value of a function, but I have no idea how to do this.I've tried different things but nothing worked.
我用 qtDesigner 创建了这个简单的 UI，我想每 10 秒用一个函数的值更新我的标签，但我不知道如何做到这一点。我尝试了不同的东西，但没有任何效果。
def example():
...
return text
UI:
用户界面：
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(400, 300)
self.label = QtWidgets.QLabel(Form)
self.label.setGeometry(QtCore.QRect(165, 125, 61, 16))
self.label.setObjectName("label")
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "Form"))
self.label.setText(_translate("Form", plsupdatethis)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Form = QtWidgets.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
sys.exit(app.exec_())
回答by Brendan Abel
Ideally, you would create a subclass of QWidget(instead of simply instantiating it the way you are doing with Form). But here is a way you could do it with minimal changes.
理想情况下，您将创建一个子类QWidget（而不是像您那样简单地实例化它Form）。但是这里有一种方法可以让您以最少的更改来做到这一点。
You have a function that is capable of updating the label. Then use a QTimerto trigger it at regular intervals (in this case, every 10 seconds).
您有一个能够更新标签的函数。然后使用 aQTimer定期触发它（在这种情况下，每 10 秒）。
import datetime
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
Form = QtWidgets.QWidget()
ui = Ui_Form()
ui.setupUi(Form)
Form.show()
def update_label():
current_time = str(datetime.datetime.now().time())
ui.label.setText(current_time)
timer = QtCore.QTimer()
timer.timeout.connect(update_label)
timer.start(10000) # every 10,000 milliseconds
sys.exit(app.exec_())
