Declarative Auto Layout extension to UIView

UIView+LayoutConstraints.swift

import UIKit

extension UIView {
    
    // Declarative Auto Layout helper. Does the same thing as creating a layout constraint but feels more intuitive.
    // Also, it remembers to set translatesAutoresizingMaskIntoConstraints = false and allows you to set a constraint's
    // priority all in a single method call
    // Plus you also don't have to worry about activating the constraint
    // Returns: the created constraint in case you wish to hold onto it
    @discardableResult public func pin(_ attr1: NSLayoutConstraint.Attribute, to attr2: NSLayoutConstraint.Attribute = .notAnAttribute, of view2: Any? = nil, relatedBy relation: NSLayoutConstraint.Relation = .equal, multiplier: CGFloat = 1, constant c: CGFloat = 0, priority: UILayoutPriority = UILayoutPriority.required, isActive: Bool = true) -> NSLayoutConstraint {
        translatesAutoresizingMaskIntoConstraints = false
        
        let constraint = NSLayoutConstraint(item: self, attribute: attr1, relatedBy: relation, toItem: view2, attribute: attr2, multiplier: multiplier, constant: c)
        constraint.priority = priority
        constraint.isActive = isActive
        
        return constraint
    }
    
    @discardableResult public func pinEdges(to view2: Any? = nil, withInsets insets: UIEdgeInsets = .zero) -> [NSLayoutConstraint] {
        let top = pin(.top, to: .top, of: view2 ?? superview, constant: insets.top)
        let leading = pin(.leading, to: .leading, of: view2 ?? superview, constant: insets.left)
        let bottom = pin(.bottom, to: .bottom, of: view2 ?? superview, constant: -insets.bottom)
        let trailing = pin(.trailing, to: .trailing, of: view2 ?? superview, constant: -insets.right)
        
        return [top, leading, bottom, trailing]
    }
    
    @discardableResult public func pinMargins(to view2: Any? = nil, withInsets insets: UIEdgeInsets = .zero) -> [NSLayoutConstraint] {
        let top = pin(.topMargin, to: .topMargin, of: view2 ?? superview, constant: insets.top)
        let leading = pin(.leadingMargin, to: .leadingMargin, of: view2 ?? superview, constant: insets.left)
        let bottom = pin(.bottomMargin, to: .bottomMargin, of: view2 ?? superview, constant: -insets.bottom)
        let trailing = pin(.trailingMargin, to: .trailingMargin, of: view2 ?? superview, constant: -insets.right)
        
        return [top, leading, bottom, trailing]
    }
}