sizing a UIView embeded in a UIView - ios

Question

I am attempting to make a UIView that is constrained to the bottom of the container view without actually doing auto layout an constraints. Here is my code:
-(void)viewDidLoad
{
[super viewDidLoad];
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
self.graphView.frame = CGRectMake(0,screenHeight - (screenWidth / 2), screenWidth, screenWidth / 2);
}
I was hoping this would create a subview that would appear pinned to the bottom of the screen and be the width of the screen and half that tall. However, when the view loads, there is some space between my graphView and the bottom of the screen. Any clue why this is?

Answer 1

I think you are using screenWidth when you need use screenHeight
The correct code:
-(void)viewDidLoad
{
[super viewDidLoad];
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGFloat screenWidth = screenRect.size.width;
CGFloat screenHeight = screenRect.size.height;
self.graphView.frame = CGRectMake(0,screenHeight - (screenHeight / 2), screenWidth, screenHeight / 2);
}

Answer 2

The solution: Turn off auto layout and any other IB toggles that have an effect on where the view is being placed. The original code is correct for the rectangle I wanted, it was just being moved by auto layout. Also it's better to set up the graph container like this:
self.graphContainer = [[UIView alloc] initWithFrame:CGRectMake(0,screenHeight - (screenHeight / 2), screenWidth, screenHeight / 2)];