How to sort QList<QVariant> in Qt?

问题

I have the following datastructure.

QList<QVariant> fieldsList

How can I sort this list? This list contains strings. I want to sort the fieldList alphabetically?

回答1:

I would do sorting in the following way:

 // Compare two variants.
 bool variantLessThan(const QVariant &v1, const QVariant &v2)
 {
     return v1.toString() < v2.toString();
 }

 int doComparison()
 {
     [..]
     QList<QVariant> fieldsList;

     // Add items to fieldsList.

     qSort(fieldsList.begin(), fieldsList.end(), variantLessThan);
 }

回答2:

In Qt5, it seems qSort is deprecated. It's recommended to use:

#include <algorithm>
QList<QVariant> fieldsList;
std::sort(fieldsList.begin(), fieldsList.end());

Reference: site

回答3:

For QList sorting your can use qSort

If you like to use QVariant for sorting or similar it has some stumblestones. Depending what you like to do you may write your own operator overlays.

BUT it bears quite a bit of danger! Because you might have to compare non-compatible values

回答4:

int n;
int i;
for (n=0; n < fieldsList.count(); n++)
{
    for (i=n+1; i < fieldsList.count(); i++)
    {
        QString valorN=fieldsList.at(n).field();
        QString valorI=fieldsList.at(i).field();
        if (valorN.toUpper() > valorI.toUpper())
        {
            fieldsList.move(i, n);
            n=0;
        }
    }
}    

来源：https://stackoverflow.com/questions/21578577/how-to-sort-qlistqvariant-in-qt