QtQuick：无法从子级访问动态添加的属性

Question

我的结构类似于：

import QtQuick 2.0

Item {
    Item {
        Component.onCompleted: console.log("foo ", parent.gridMap)
    }
    Component.onCompleted: console.log("bar ", gridMap)
}

此项目将通过createObject(baz, {"gridMap": gridMap}) gridMap: []。

从其他项目创建

为什么我得到类似以下的输出？

bar []
foo undefined

Answer 1

就我而言，如果我尝试你的代码，我会收到错误'gridMap未定义'。

所以只需在组件中声明'gridMap'即可，QML无法添加新属性，只需将初始值传递给存在的值......

import QtQuick 2.0;

Rectangle {
    width: 360;
    height: 360;


    Component.onCompleted: { // try your code
        var obj = component.createObject (baz, { "gridMap" : [ 3, 5, 9] });
    }

    Row {
        id: baz;

        // for newly created items
    }

    Component { // the component to instanciate
        id: component;

        Item {

            property var gridMap;

            Item {
                Component.onCompleted: console.log("foo ", parent.gridMap)
            }

            Component.onCompleted: console.log("bar ", gridMap)
        }
    }
}