YaroslavZhurbilo
11/13/2017 - 4:17 PM

Programmatically scroll a UIScrollView to the top of a child UIView (subview) in Swift

https://stackoverflow.com/questions/39018017/programmatically-scroll-a-uiscrollview-to-the-top-of-a-child-uiview-subview-in Programmatically scroll a UIScrollView to the top of a child UIView (subview) in Swift

extension.swift
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extension UIScrollView {

    // Scroll to a specific view so that it's top is at the top our scrollview
    func scrollToView(view:UIView, animated: Bool) {
        if let origin = view.superview {
            // Get the Y position of your child view
            let childStartPoint = origin.convertPoint(view.frame.origin, toView: self)
            // Scroll to a rectangle starting at the Y of your subview, with a height of the scrollview
            self.scrollRectToVisible(CGRectMake(0, childStartPoint.y, 1, self.frame.height), animated: animated)
        }
    }

    // Bonus: Scroll to top
    func scrollToTop(animated: Bool) {
        let topOffset = CGPoint(x: 0, y: -contentInset.top)
        setContentOffset(topOffset, animated: animated)
    }

    // Bonus: Scroll to bottom
    func scrollToBottom() {
        let bottomOffset = CGPoint(x: 0, y: contentSize.height - bounds.size.height + contentInset.bottom)
        if(bottomOffset.y > 0) {
            setContentOffset(bottomOffset, animated: true)
        }
    }

}