iphone - Issue in Cropping Image -

below code, having issue cropping image, can please solve this.

uigraphicsbeginimagecontext(self.view.bounds.size);          cgcontextref context = uigraphicsgetcurrentcontext();          cgcontextmovetopoint(context, newpoint1.x, newpoint1.y);         cgcontextaddlinetopoint(context, newpoint1.x, newpoint2.y);         cgcontextaddlinetopoint(context, newpoint2.x, newpoint2.y);         cgcontextaddlinetopoint(context, newpoint2.x, newpoint1.y);         cgcontextaddlinetopoint(context, newpoint1.x, newpoint1.y);         cgcontextclosepath(context);          uicolor *blue = [uicolor colorwithred: (0.0/255.0 ) green: (0.0/255.0) blue: (255.0/255.0) alpha:0.4];         cgcontextsetfillcolorwithcolor(context, blue.cgcolor);          cgcontextdrawpath(context, kcgpathfillstroke); 

leave use following method cropping image

- (uiimage *)capturescreeninrect:(cgrect)captureframe {      calayer *layer;     layer = self.view.layer;     uigraphicsbeginimagecontext(self.view.frame.size);      cgcontextcliptorect (uigraphicsgetcurrentcontext(),captureframe);     [layer renderincontext:uigraphicsgetcurrentcontext()];     uiimage *screenimage = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     return screenimage; }