chriswill0w

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

chriswill0w

objective-c

po [[[UIWindow keyWindow] rootViewController] _printHierarchy]

swift

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

chriswill0w

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

chriswill0w

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

chriswill0w

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

chriswill0w

//
//  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 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`.

chriswill0w

xcrun simctl erase all

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frame variable -d r MYVAR
fr var MYVAR
po MYVAR

chriswill0w

zsh 
cp **/*.pdf /targetfolder