objective c - having trouble drawing a rectangle to the screen ios -

i following video tutorial pluralsight draws red rectangle screen. have subclass of uiview called psviewdemo has following code in .m file:

// override drawrect: if perform custom drawing. // empty implementation adversely affects performance during animation. - (void)drawrect:(cgrect)rect {     cgcontextref context = uigraphicsgetcurrentcontext();     cgcontextsetfillcolor(context, [uicolor redcolor].cgcolor);     cgcontextfillrect(context, cgrectmake(40, 400,100,200));     // drawing code } 

i call in viewdidload of viewcontroller view in application (until code adds subview).

- (void)viewdidload {      [super viewdidload];     psviewdemo *dv = [[psviewdemo alloc] initwithframe:cgrectmake( 0, 0, 320, 480)];     [self.view addsubview:dv];     // additional setup after loading view, typically nib. } 

the whole thing compiles , runs without error there no red rectangle on screen.

what missing? pretty sure following tutorial maybe has changed in cocoa since tutorial made? i'm using xcode 5.

change

cgcontextsetfillcolor(context, [uicolor redcolor].cgcolor); 

to

cgcontextsetfillcolor(context, cgcolorgetcomponents([[uicolor redcolor] cgcolor]));