在QQuickView源中重新加载qml

Question

我有test.qml文件，在PyQt5中使用

self.view = QQuickView()
self.view.setResizeMode(QQuickView.SizeRootObjectToView)
self.view.setSource(QUrl.fromLocalFile(os.path.join(os.path.dirname(__file__),'test.qml')))

我有一个按钮，当它被点击时，它会覆盖test.qml并再次调用视图来读取test.qml文件，但是它仍然显示旧的test.qml，而不是新的。为什么？

与QQmlEngine clearComponentCache()有关吗？

代码示例：

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtCore import QUrl
from PyQt5.QtQuick import QQuickView
import  os

class Ui_MainWindow(object):

    def add(self):
        # call a function in a nother python file that will open test.qml and overwite it 
        # when i call the test.qml again it will show the old version not the new one 
        self.view.setSource(QUrl.fromLocalFile(os.path.join(os.path.dirname(__file__),'root.qml'))) 

    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(800, 600)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(420, 380, 113, 32))
        self.pushButton.setObjectName("pushButton")
        self.frame = QtWidgets.QFrame(self.centralwidget)
        self.frame.setGeometry(QtCore.QRect(170, 50, 551, 311))
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        vbox = QtWidgets.QVBoxLayout(self.frame)

        # loading the qml for the first time
        self.view = QQuickView()
        self.view.setResizeMode(QQuickView.SizeRootObjectToView)
        self.view.setSource(QUrl.fromLocalFile(os.path.join(os.path.dirname(__file__),'root.qml')))
        self.widget = QtWidgets.QWidget.createWindowContainer(self.view)
        vbox.addWidget(self.widget)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 22))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)
        self.pushButton.clicked.connect(self.add)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.pushButton.setText(_translate("MainWindow", "PushButton"))


if __name__ == "__main__":
   import sys
   app = QtWidgets.QApplication(sys.argv)
   MainWindow = QtWidgets.QMainWindow()
   ui = Ui_MainWindow()
   ui.setupUi(MainWindow)
   MainWindow.show()
   sys.exit(app.exec_())

Answer 1

我还没有使用过QQuickView，而是更喜欢QQmlApplicationEngine。通过它，我使用了一种类似于概述here的方法。

我想您可以在主窗口类中添加这样的方法：

def reload(self):
    self.view.engine().clearComponentCache()
    self.view.setSource(
        QUrl.fromLocalFile(
            os.path.join(os.path.dirname(__file__),'root.qml')))

clearComponentCache()方法导致引擎丢弃以前加载的任何QML文档。在下一次加载操作中(例如，通过在视图中使用setSource() )，引擎将被迫从磁盘重新加载文件。