Qt load indicator by animated image (aka preloader) or alternative?

问题

I want to display an animated loader image on my table view while loading. The screenshot below shows an impression.

I have used an animated gif for that, displayed by setStyleSheet as centered background image.

I face two issues:

1. The gif is displayed, but not animated. Is it possible to display an animated gif as background image (via stylesheet)? Remark: In general an animated gif is possible as shown in Qt - How to show gif(animated) image in QGraphicsPixmapItem but there seems to be no animated gif with style sheets Animated Gif static in QStyleSheet
2. I have problems to clear the image once loading is done. If I clear the stylesheet with setStyleSheet("") then it is still displayed. The only trick working for me is to override it as 1 pixel transparent image

Is there a solution to those issues or even a better approach (overlay widget? / specialized Qt widget for that)?

(My code exampled with Qt 5.4 / Win7)

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Edit: https://stackoverflow.com/a/26958738/356726 shows how such a gif can be animated, but I have no idea to use that in such a kind of overlay / background style.

回答1:

Use QProgressIndicator insted of gif animation.

PS: it says that it Qt4, but it works with Qt5.

来源：https://stackoverflow.com/questions/32636864/qt-load-indicator-by-animated-image-aka-preloader-or-alternative