IOS/Objective-C: Subview of Subview not displaying

Question

I am trying to create a chart where a bar in the form of a UIView displays on top of a background UIView. I'd like both to display on top of the UIView for the whole screen. I have done this before successfully, but while I can get the first view to display, I somehow can't get my code to display the bar. Could it have something to do with setting the color? Or can anyone suggest why the second subview is not displaying.

My code:

//Make background box:  
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    CGFloat screenWidth = screenRect.size.width;
    CGFloat graphWidth = screenWidth-40;
    CGFloat graphHeight = 160;
      CGRect graphBounds =CGRectMake(20, 200, graphWidth, graphHeight);
    float tableStartY = graphBounds.origin.y;

    UIView *graphBox = [[UIView alloc] initWithFrame:graphBounds];
    graphBox.backgroundColor = [UIColor colorWithRed:200.0/255.0 green:200.0/255.0 blue:200.0/255.0 alpha:0.2]; graphBox.layer.borderWidth = 1;
    graphBox.layer.borderColor = [UIColor blueColor].CGColor;

//Make Bar

    CGFloat barWidth = 20;
    CGFloat barHeight = 100;
    CGRect aBar = CGRectMake(20, tableStartY+1, barWidth, barHeight);
    UIView *barView = [[UIView alloc] initWithFrame:aBar];
   barView.backgroundColor = [UIColor blueColor];
    barView.layer.borderWidth = 1;
    barView.layer.borderColor = [UIColor redColor].CGColor;

   // [graphBox addSubview:barView];
    [self.view addSubview: graphBox];

If I run the above code, it displays the graphBox. If I add the bar directly to the view as a subView instead of the graphBox, the bar displays. However, if I uncomment out the line shown and add the barView first to the graphBox and then add the graphBox to the view, the barView does not display.

Thanks in advance for any suggestions.

Answer 1

If I understand correctly what you need to do, you should replace

CGRect aBar = CGRectMake(20, tableStartY+1, barWidth, barHeight);

with

CGRect aBar = CGRectMake(20, 1, barWidth, barHeight);

[edit: and obviously uncomment the addSubview line]