在python中使用PyQt5按下按钮时更改QML中的标签[复制](Change label in QML when button is pressed using PyQt5 in python [duplicate])

 
 
 这个问题在这里已经有了答案： 
 
 
 
  
 QML没有接受从PyQt slot 1 接收到的对象的所有权 
 
 
 
 
 我试图用PyQt5和QML做一个简单的任务：有一个按钮在被点击时改变标签。 我已经能够在按下按钮时执行python函数，但我不知道如何更改标签中的文本。 
 
 这是一个简单的例子： 
 
 main.py 
 
from PyQt5.QtWidgets import *
from PyQt5.QtQml import *
from PyQt5.QtCore import *

import sys

def onClicked():
    print('handler called')

if __name__ == '__main__':
    app = QApplication(sys.argv)

    engine = QQmlApplicationEngine()
    engine.load(QUrl('main.qml'))

    win = engine.rootObjects()[0]
    button = win.findChild(QObject, 'myButton')
    button.messageRequired.connect(onClicked)

    sys.exit(app.exec_())
 
 main.qml 
 
import QtQuick 2.7
import QtQuick.Controls 2.3
import QtQuick.Window 2.3

ApplicationWindow{
    title: qsTr('Quomodo')
    id: mainWindow
    width:  480
    height: 640
    visible: true

    Column {
        anchors.horizontalCenter: parent.horizontalCenter
        spacing: 8
        padding: 8

        Button {
            signal messageRequired
            objectName: "myButton"
            text: qsTr("Work")
            highlighted: true
            onClicked: messageRequired()
        }

        Label {
            text: qsTr("Time")
            anchors.horizontalCenter: parent.horizontalCenter
        }

    } 
}
 
 例如，如何将标签的文本更改为“下一个”？ 
 
 注意：这不是QML的重复，它没有取得从PyQt插槽收到的对象的所有权 。 这个问题是关于Python和QML之间数据的所有权，并没有回答这个问题。 

 
 
This question already has an answer here:
 
 
 
  
 QML not taking ownership of object received from PyQt slot  1 answer  
 
 
 
 
I'm trying to do a simple task with PyQt5 and QML: have a button that changes a label when it is clicked. I've been able to execute a python function when the button is pressed, but I don't know how to change the text in the label.
 
This is a minimal example:
 
main.py
 
from PyQt5.QtWidgets import *
from PyQt5.QtQml import *
from PyQt5.QtCore import *

import sys

def onClicked():
    print('handler called')

if __name__ == '__main__':
    app = QApplication(sys.argv)

    engine = QQmlApplicationEngine()
    engine.load(QUrl('main.qml'))

    win = engine.rootObjects()[0]
    button = win.findChild(QObject, 'myButton')
    button.messageRequired.connect(onClicked)

    sys.exit(app.exec_())
 
main.qml
 
import QtQuick 2.7
import QtQuick.Controls 2.3
import QtQuick.Window 2.3

ApplicationWindow{
    title: qsTr('Quomodo')
    id: mainWindow
    width:  480
    height: 640
    visible: true

    Column {
        anchors.horizontalCenter: parent.horizontalCenter
        spacing: 8
        padding: 8

        Button {
            signal messageRequired
            objectName: "myButton"
            text: qsTr("Work")
            highlighted: true
            onClicked: messageRequired()
        }

        Label {
            text: qsTr("Time")
            anchors.horizontalCenter: parent.horizontalCenter
        }

    } 
}
 
How can I change the text of the label to "Next", for instance?
 
Note: This is not a duplicate of QML not taking ownership of object received from PyQt slot. That question is about ownership of the data between Python and QML, and doesn't answer this question.

原文：https://stackoverflow.com/questions/50115934