Scale UIView with the top center as the anchor point?

Question

I\'m scaling a UIView with CGAffineTransformMakeScale but I want to keep it anchored to it\'s current top center point as it\'s scaled.

I\'ve looked into setting

Answer 1

By using an extension

Scaling an UIView with a specific anchor point while avoiding misplacement:

extension UIView {
    func applyTransform(withScale scale: CGFloat, anchorPoint: CGPoint) {
        layer.anchorPoint = anchorPoint
        let scale = scale != 0 ? scale : CGFloat.leastNonzeroMagnitude
        let xPadding = 1/scale * (anchorPoint.x - 0.5)*bounds.width
        let yPadding = 1/scale * (anchorPoint.y - 0.5)*bounds.height
        transform = CGAffineTransform(scaleX: scale, y: scale).translatedBy(x: xPadding, y: yPadding)
    }
}

So to shrink a view to half of its size with its top center as anchor point:

view.applyTransform(withScale: 0.5, anchorPoint: CGPoint(x: 0.5, y: 0))