iphone - How to take a screenshot when video playing? -

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how take screen shot when video playing? used mpmovieplayercontroller video playing.

- (uiimage *) capturescreen  {     uiwindow *keywindow = [[uiapplication sharedapplication] keywindow];     cgrect rect = [keywindow bounds];     uigraphicsbeginimagecontext(rect.size);     cgcontextref context = uigraphicsgetcurrentcontext();     [keywindow.layer renderincontext:context];        uiimage *img = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     return img; }

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