AlignMoveableImageView.swift

    var topOffset: CGFloat = 0.0
    private let kTopWindowAspectRatio : CGFloat = 3.0/4.0
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        // Calculate the top offset and set it if not corectly set
        if(topOffset != CGRectGetWidth(pullDownTableView.bounds) * kTopWindowAspectRatio) {
            topOffset = CGRectGetWidth(pullDownTableView.bounds) * kTopWindowAspectRatio
            // Setup table view insets and offsets
            let topInset = CGRectGetHeight(pullDownTableView.bounds)
            pullDownTableView.contentInset = UIEdgeInsetsMake(topInset, 0, 0, 0);
            pullDownTableView.contentOffset = CGPointMake(0, -topOffset)
            // Align the moveable image view center
            moveableImageView.center = view.center
            moveableImageView.center.y = topOffset/2
        }
    }