寫入全局屬性QML無效

Question

我有這個信號

class SystemUICfgScanner 
{
    /*code here*/
signals:
    void error(QString desc);
    /*more code*/
};

在QML中，我使用InfoBanner：

InfoBanner
{
    property string infodetails: ""
    id: systemuicfgErrorBanner
    text: "Error: " + infodetails
    Connections
    {
        target: cfgScanner
        onError: infodetails = desc
    }
}

當發出錯誤（QString）信號時，我收到此錯誤

Invalid write to global property "infodetails"

我究竟做錯了什么？

提前致謝

Answer 1

嘗試通過id引用InfoBanner實例：

InfoBanner
{
    property string infodetails: ""
    id: systemuicfgErrorBanner
    text: "Error: " + infodetails
    Connections
    {
        target: cfgScanner
        onError: systemuicfgErrorBanner.infodetails = desc
    }
}