PyQt5 + QML：带有“无法将[未定义]分配给QString”的空窗口

Question

我正在尝试 PyQt5 + QML，如下：

test.py:

# -*- coding: utf-8 -*-
import sys, os, math

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.Qt import *
from PyQt5.QtQuick import * 

class Hello(QObject):
    def get_greeting(self):
        return QString('Hello World!')


app = QApplication(sys.argv)
hello = Hello()
view = QQuickView()

context = view.rootContext()
context.setContextProperty('hello',  hello)
view.setSource(QUrl(__file__.replace('.py', '.qml')))

view.show()
app.exec_()

test.qml:

import QtQuick 2.0              

Rectangle {
    color: "red"
    width: 350
    height: 350
    Text {
        anchors.centerIn: parent
        font.pointSize: 32
        color: "white"
        text: hello.get_greeting
    }
}

确实会弹出一个红色窗口，但没有任何文本和控制台给我一条消息：

"Qt Warning - invalid keysym:dead_actute" 
file:///....../test.qml:11:15: Unable to assign [undefined] to QString 

Answer 1

我找到了解决方案：在def get_greeting(self): 之前添加一个@pyqtProperty(str) 装饰器。