我试图用PyQt5和QML做一个简单的任务:有一个按钮可以在点击时更改标签。我按下按钮后能够执行python功能,但我不知道如何更改标签中的文字。
这是一个最小的例子:
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
}
}
}
如何将标签文本更改为" Next",例如?
注意:这不是QML not taking ownership of object received from PyQt slot的重复。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。
答案 0 :(得分:1)
试一试:
from PyQt5.QtGui import QGuiApplication
from PyQt5.QtQml import QQmlApplicationEngine
from PyQt5.QtCore import QObject, pyqtSignal, pyqtSlot, QUrl
class Main(QObject):
def __init__(self):
QObject.__init__(self)
# signal sending string
# necessarily give the name of the argument through arguments=['textLabel']
# otherwise it will not be possible to pick it up in QML
textResult = pyqtSignal(str, arguments=['textLabel'])
@pyqtSlot(str)
def textLabel(self, arg1):
# do something with the text and emit a signal
arg1 = arg1.upper()
self.textResult.emit(arg1)
if __name__ == "__main__":
import sys
app = QGuiApplication(sys.argv)
engine = QQmlApplicationEngine()
main = Main()
engine.rootContext().setContextProperty("main", main)
engine.load(QUrl('main.qml'))
engine.quit.connect(app.quit)
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 {
objectName: "myButton"
text: qsTr("Work")
highlighted: true
onClicked: {
// call the slot to process the text
main.textLabel("Next")
}
}
Label {
id: textResult
text: qsTr("Time")
anchors.horizontalCenter: parent.horizontalCenter
}
}
// Here we take the result of text processing
Connections {
target: main
// Signal Handler
onTextResult: {
// textLabel - was given through arguments=['textLabel']
textResult.text = textLabel
}
}
}