ios - Capture screenshot from another ViewController - Obj C -

i using:

        cgrect rect = [self.view bounds];         uigraphicsbeginimagecontextwithoptions(rect.size,yes,0.0f);         cgcontextref context = uigraphicsgetcurrentcontext();         [self.view.layer renderincontext:context];         uiimage *capturedimage = uigraphicsgetimagefromcurrentimagecontext();          uigraphicsendimagecontext(); 

this retrieves screen shot of current view once uitabbaritem selected. problem is, capture view of current view user active on before switching next view.

to better understand this. have uitabbarcontroller manages navigation app. walk in view controller table want capture picture of when user selects share uitabbaritem on navigation. have linked method checks see if share has been clicked , creates image of current view shown above.

my roadblock is, how can capture image of first view(walk in view) every time no matter view user on?

i handling capturing functionality within custom class initates uitabbarcontroller

suggestions thoughts?

will you?

cgrect rect = [yourtabcontroller.viewcontrollers[walkinviewindex].view bounds];  uigraphicsbeginimagecontextwithoptions(rect.size,yes,0.0f); cgcontextref context = uigraphicsgetcurrentcontext();  [yourtabcontroller.viewcontrollers[walkinviewindex].view.layer renderincontext:context]; uiimage *capturedimage = uigraphicsgetimagefromcurrentimagecontext();  uigraphicsendimagecontext();