ios - UIView --> UIImage for non-visible view? -

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i'm trying go work around inability use custom ui elements in watchkit. app uses custom uibuttons (mroundedbutton) , i'm trying replicate them on watchkit interface creating images of them , using background wkinterfacebutton. problem i'm not able convert uiviews uiimage when view isn't visible. code i'm using, it's giving me index out of bounds error on drawviewhierarchyinrect.

- (uiimage *)convertbuttontoimage:(mroundedbutton *)button {     uigraphicsbeginimagecontextwithoptions(button.bounds.size, yes, 0);      [button drawviewhierarchyinrect:button.bounds afterscreenupdates:yes];     uiimage *image = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();       return image; }

since there no screen/window in watchkit extension, how go creating images would-be views?

rather drawviewhierarchyinrect, try using renderincontext on layer.

i ran same problem describe. using drawviewhierarchinrect didn't work - black screen. after switching renderincontext, looks i'm able convert uiview uiimage app while it's in background (so without view being visible on screen), , can send on watch , it's displayed.

here's used:

+ (uiimage *)imagefromview:(uiview *)view { uigraphicsbeginimagecontextwithoptions(view.bounds.size, yes, 0.0); [view.layer renderincontext:uigraphicsgetcurrentcontext()]; //    [view drawviewhierarchyinrect:view.bounds afterscreenupdates:no]; uiimage *capturedimage = uigraphicsgetimagefromcurrentimagecontext(); uigraphicsendimagecontext(); return capturedimage; }

then use openparentapplication watchkit extension ping phone, convert uiimage nsdata in order pass in handlewatchkitextensionrequest. looks it's working me far, too. done on simulator, btw.


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