组件缺少必需属性

qmllint 将此警告类别拼写为[required] 。

组件缺少必填属性

发生了什么？

组件的必填属性未被设置。

这有什么问题？

在 QML 应用程序中，如果组件缺少必需属性，将会导致行为异常：如果静态检测到缺少必需属性，应用程序将完全无法启动。运行时，缺少必需属性的动态创建组件将无法被创建：它们将被设为 null。

示例

import QtQuick

Item {
    component RepeatMe: Item {
        required property int index;
        required property int helloWorld;
    }

    RepeatMe {} // not ok: required properties index and helloWorld not set

    Repeater {
        model: 10
        RepeatMe {} // not ok: required property index set by Repeater, but not helloWorld
    }
}

要解决此警告，请设置必需属性：

import QtQuick

Item {
    component RepeatMe: Item {
        required property int index;
        required property int helloWorld;
    }

    RepeatMe {
        index: 0
        helloWorld: 42
    } // ok: all required properties were set

    Repeater {
        model: 10
        RepeatMe {
            helloWorld: index * 2 + 1
        } // ok: all required properties were set: index by the Repeater and helloWorld by the user
    }
}

另请参阅 《QML 编码规范——必填属性》。

冗余的可选链受限类型

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