Test relations between main properties of `UIView`

TestViewProperties.swift

import UIKit

extension UIView {

    func dumpProperties() {
        print("""
        ▿
          - bounds: \(bounds)
          - frame: \(frame)
          - center: \(center)
          - transform: \(transform)
        """)
    }
}

let superview = UIView()
let subview = UIView()
superview.addSubview(subview)
test(subview)
    
private func test(_ view: UIView) {
    view.frame = CGRect(x: 10, y: 10, width: 20, height: 30)
    view.bounds.origin = CGPoint(x: 5, y: 5)
    view.dumpProperties()
    
    // changing size from bounds will affect both frame(origin + size) and bounds(size), but not center
    view.bounds.size = CGSize(width: 10, height: 10)
    view.dumpProperties()
    
    // changing size from frame will affect both frame(size) and bounds(size) and center, but not frame.origin
    // note this difference because `CGRect` is a value object, this may seem unresonable to you
    view.frame.size = CGSize(width: 20, height: 20)
    view.dumpProperties()
    
    // changing transform will affect frame(origin+size), but not center or bounds
    view.transform = CGAffineTransform(scaleX: 1.5, y: 1.5)
    view.dumpProperties()
    
    // changing frame/origin will not affect transform, so bounds.size may not be same with frame.size
    view.frame = CGRect(x: 0, y: 0, width: 5, height: 5)
    view.bounds.origin = CGPoint(x: 5, y: 5)
    view.dumpProperties()
    
    view.bounds.size = CGSize(width: 5, height: 5)
    view.dumpProperties()
    
    // changing center will only affect frame.origin
    view.center = CGPoint(x: 0, y: 0)
    view.dumpProperties()
}