How can I increase the size of a CGRect by a certain percent value?

Question

How can I increase the size of a CGRect by a certain percent value? Should I use some form of CGRectInset to do it?

Example:

Assume I have a CGRect:

Answer 1

I'm using CGRect > insetBy in my Swift code

https://developer.apple.com/documentation/coregraphics/cgrect/1454218-insetby

With this, your percent value will be the scaleX as my example.

    let dx = rectWidth*scaleX
    let dy = rectHeight*scaleX
    let rectangle = CGRect(x: rectX,
                           y: rectY,
                           width: rectWidth,
                           height: rectHeight).insetBy(dx: -dx, dy: -dy)

• use positive value to scale down
• use negative value to scale up