graphics - How do I create an onClick drawLine function in swift? -

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i need create function make line connecting 2 buttons when pressed. however, way can figure out how create line predetermined start , endpoint. 

func drawlinefrom(frompoint: cgpoint, topoint: cgpoint) {      uigraphicsbeginimagecontext(view.frame.size)     let context = uigraphicsgetcurrentcontext()      cgcontextsetlinewidth(context, 3.0) /* setting line width: set let , width next (let, width) */     cgcontextsetstrokecolorwithcolor(context, uicolor.purplecolor().cgcolor)      cgcontextmovetopoint(context, oldlocation.x, oldlocation.y)     cgcontextaddlinetopoint(context, newlocation.x, newlocation.y)      cgcontextstrokepath(context)     uigraphicsendimagecontext() }

when call function, in class, testing, have figured out entire thing runs, , oldlocation , newlocation have appropriate values create line. however, no line created (or @ least not visible). there command neglecting run, or else problem?


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