Social Tunes Sharer Code Sample: Changing Constraints

ViewController.swift

// From Andrew’s code

private func open() {
    // First shift the bottom view all the way to the right
    bottomViewLeading.constant = CGRectGetWidth(shareContainerView.bounds)
    view.layoutIfNeeded()

    // Now animate the views into place
    topViewLeading.constant = -CGRectGetWidth(shareContainerView.bounds)
    bottomViewLeading.constant = 0

    UIView.animateWithDuration(slideAnimationDuration) {
        self.view.layoutIfNeeded()
    }
}