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extension NSMutableAttributedString {
    @discardableResult
    func setAsLink(_ textToFind: String, linkURL: String) -> Bool {
        let foundRange = mutableString.range(of: textToFind)
        guard foundRange.location != NSNotFound else { return false }
        addAttribute(NSAttributedStringKey.link, value: linkURL, range: foundRange)
        return true
    }
}

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I was trying to reinstall High Sierra on an older MacBook Air using internet recovery and I kept on getting an error message when trying to reinstall High Sierra.

The recovery server could not be contacted

It appears that this has to do with the time on the machine not being synchronized, so when the MacBook tries to reach out to the recovery server the certificates do not validate and we get this useless error message.

To fix this.

1. Open up a Terminal from the utilities menu
2. Enter the following command

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objective-c

po [[[UIWindow keyWindow] rootViewController] _printHierarchy]

swift

expr -l objc++ -O -- [[[UIWindow keyWindow] rootViewController] _printHierarchy]

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for family in UIFont.familyNames {
        let sName: String = family as String
        print("family: \(sName)")

        for name in UIFont.fontNames(forFamilyName: sName) {
                print("name: \(name as String)")
        }
}

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extension UIViewController {
    func add(_ child: UIViewController) {
        addChildViewController(child)
        view.addSubview(child.view)
        child.didMove(toParentViewController: self)
    }
    func remove() {
        guard parent != nil else {
            return
        }

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extension UIViewController {
    func add(_ child: UIViewController) {
        addChildViewController(child)
        view.addSubview(child.view)
        child.didMove(toParentViewController: self)
    }
    func remove() {
        guard parent != nil else {
            return
        }

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extension Data {
    var sizeMB: String{
        let formatter = ByteCountFormatter()
        formatter.allowedUnits = [.useMB]
        formatter.countStyle = .file
        return formatter.string(fromByteCount: Int64(self.count))
    }
}

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//
//  AppStoryboards.swift
//  AppStoryboards
//
//  Created by Gurdeep on 15/12/16.
//  Copyright © 2016 Gurdeep. All rights reserved.
//

import Foundation
import UIKit

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import UIKit
import PureLayout

extension UIViewController {
    func addChildController(_ controller: UIViewController, containerView: UIView) {
        addChild(controller)
        // When your custom container calls the addChild(_:) method, it automatically calls the willMove(toParent:) method of the view controller to be added as a child before adding it.
        containerView.addSubview(controller.view)
        controller.view.translatesAutoresizingMaskIntoConstraints = false
        controller.view.autoPinToSuperviewEdges()

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import Foundation
import UIKit

/// Checkbox is a simple, animation free checkbox and UISwitch alternative designed
/// to be performant and easy to implement.
public class Checkbox: UIControl {

    // MARK: - Enums

    /// Shape of the center checkmark that appears when `Checkbox.isChecked == true`.