这个例子是有效的:
from PySide2.QtCore import QUrl
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlComponent
from PySide2.QtQuick import QQuickView
app = QGuiApplication()
view = QQuickView()
engine = view.engine()
url = QUrl("main.qml")
view.setSource(url)
component = QQmlComponent(engine, QUrl.fromLocalFile("block.qml"))
item = component.create()
item.setParent(view.rootObject())
item.setParentItem(view.rootObject())
view.show()
app.exec_()
该项是QQuickItem的一个类。 这个组件.创建()是QQuickItem的一个类。 将此示例更改为:
from PySide2.QtCore import QUrl
from PySide2.QtGui import QGuiApplication
from PySide2.QtQml import QQmlComponent
from PySide2.QtQuick import QQuickView
app = QGuiApplication()
view = QQuickView()
engine = view.engine()
url = QUrl("main.qml")
view.setSource(url)
item = QQmlComponent(engine, QUrl.fromLocalFile("block.qml")).create()
item.setParent(view.rootObject())
item.setParentItem(view.rootObject())
view.show()
app.exec_()
它引发了一个异常:
Traceback (most recent call last):
File "/home/babywolf/dev/apps/qttest/test.py", line 14, in <module>
item.setParent(view.rootObject())
RuntimeError: Internal C++ object (PySide2.QtQuick.QQuickItem) already deleted.
Process finished with exit code 1
怎么了?你知道吗
你知道吗主.qml地址:
import QtQuick 2.0
Rectangle {
width: 200
height: 200
color: "green"
}
你知道吗块.qml地址:
import QtQuick 2.0
Text {
text: "Hello World"
anchors.centerIn: parent
}
这是PySide的一种特殊行为,如果变量没有分配给对象,它就会被消除,因此在这种情况下,QQmlComponent被创建,但没有分配给变量,因此它将被删除,这与第一种情况不同,因为它被分配给变量
component
,所以当想要创建项时,组件不再存在那个错误。你知道吗一种解决方案是传递父级,因为在这种情况下可以通过视图来延长其生命周期:
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