附加属性重复使用

此警告类别由 qmllint 拼写为[attached-property-reuse] 。

使用父作用域中已初始化的附加类型

发生了什么？

您多次初始化了一个传播的附加类型。

注意： 这主要发生在从QQuickAttachedPropertyPropagator 继承的附加类型上。

为什么会这样？

传播附加对象每次实例化都会消耗内存，但只需初始化一次。

示例

import QtQuick
import QtQuick.Templates as T
import QtQuick.Controls.Material // contains the Material attached type

T.ToolBar {
    id: control

    // first instantiation of Material's attached property
    property color c: Material.toolBarColor

    background: Rectangle {
         // second instantiation of Material's attached property, wrong!
        color: Material.toolBarColor
    }
}

要修复此警告，请查询父类中的附加类型：

import QtQuick
import QtQuick.Templates as T
import QtQuick.Controls.Material // contains the Material attached type

T.ToolBar {
    id: control

    // first instantiation of Material's attached property
    property color c: Material.toolBarColor

    background: Rectangle {
        // use control's attached property, correct!
        color: control.Material.toolBarColor
    }
}

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