1_LayoutMarginsHackView.swift

import UIKit

class LayoutMarginsHackView: UIView {
	var actualLayoutMargins: UIEdgeInsets = .zero

	override var layoutMargins: UIEdgeInsets {
		set {
			if #available(iOS 11, *) {
				super.layoutMargins = newValue
			} else {
				super.layoutMargins = actualLayoutMargins
			}
		}
		get {
			return super.layoutMargins
		}
	}
}

2_LayoutMarginsDidChangeHackView.swift

import UIKit

protocol LayoutMarginsDidChangeHackViewDelegate: class {
	func viewLayoutMarginsDidChange()
}

class LayoutMarginsDidChangeHackView: UIView {
	weak var delegate: LayoutMarginsDidChangeHackViewDelegate?

	override func layoutMarginsDidChange() {
		super.layoutMarginsDidChange()

		if #available(iOS 11, *) {
			// no-op
		} else {
			delegate?.viewLayoutMarginsDidChange()
		}
	}
}