UIView+Extensions.swift

import UIKit

extension UIView {
    
    func anchorSize(height: NSLayoutDimension?, width: NSLayoutDimension?, multiplier: CGFloat) {
        
        if let height = height {
            heightAnchor.constraint(equalTo: height, multiplier: multiplier)
        }
        
        if let width = width {
            widthAnchor.constraint(equalTo: width, multiplier: multiplier)
        }
        
    }
    
    func anchorCenter(x: NSLayoutXAxisAnchor?, y: NSLayoutYAxisAnchor?) {
        translatesAutoresizingMaskIntoConstraints = false
        
        if let x = x {
            centerXAnchor.constraint(equalTo: x).isActive = true
        }
        
        if let y = y {
            centerYAnchor.constraint(equalTo: y).isActive = true
        }
    }
    
    func anchor(top: NSLayoutYAxisAnchor?, leading: NSLayoutXAxisAnchor?, bottom: NSLayoutYAxisAnchor?, trailing: NSLayoutXAxisAnchor?, padding: UIEdgeInsets = .zero, size: CGSize = .zero) {
        
        translatesAutoresizingMaskIntoConstraints = false
        
        if let top = top {
            topAnchor.constraint(equalTo: top, constant: padding.top).isActive = true
        }

        if let leading = leading {
            leadingAnchor.constraint(equalTo: leading, constant: padding.left).isActive = true
        }
        
        if let bottom = bottom {
            bottomAnchor.constraint(equalTo: bottom, constant: -padding.bottom).isActive = true
        }
        
        if let trailing = trailing {
            trailingAnchor.constraint(equalTo: trailing, constant: -padding.right).isActive = true
        }
        
        if size.width != 0 {
            widthAnchor.constraint(equalToConstant: size.width).isActive = true
        }
        
        if size.height != 0 {
            heightAnchor.constraint(equalToConstant: size.height).isActive = true
        }
    }
}