[Interest] How to make the QString "10" behind "9" in QMap's key order

[jack ma]

Hi,

there is a QMap<QString,QGraphicsItem *> type, then insert values with：

type.insert("U1",nullptr),
type.insert("U2",nullptr),
…………
type.insert("U9",nullptr),
type.insert("U10",nullptr),

I want get the values follow the order of U1, U2 ... U10， but the default
order is U1, U10 ,……U9

I know this is a common string sorting problem, but I do not know how to
solve it well.

Any suggestions are very grateful !
Thanks.
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