mitchellporter

import UIKit

extension UIView {
    public var isShimmering: Bool {
        get {
            return layer.mask?.animation(forKey: shimmerAnimationKey) != nil
        }
        set {
            if newValue {
                startShimmering()

mitchellporter

Interview Questions for iOS Developers

1. Classes vs structs

In Swift, structs are value types whereas classes are reference types. When you copy a struct, you end up with two unique copies of the data. When you copy a class, you end up with two references to one instance of the data. It’s a crucial difference, and it affects your choice between classes or structs. (+ Class extendable, struct does not.)

2. What’s the difference between var and let? Which one would you choose for properties in a struct and why?

Both let and var are for creating variables in Swift. let helps you create immutable variables (constants) while on the other hand var creates mutable variables.

3. What does the mutating keyword mean?

The mutating keyword lets callers know that the method is going to make the value change.

mitchellporter

Architecture

• Doordash mobile architecture
• Evernote rewrite mobile app
• Scaling up an iOS app using modules

Offline Sync and Cache

• Dropbox photo offline sync
• Airbnb message sync
• Netflix download
• Trello offline works
• Expedia API cache

mitchellporter

In August 2007 a hacker found a way to expose the PHP source code on facebook.com. He retrieved two files and then emailed them to me, and I wrote about the issue:

http://techcrunch.com/2007/08/11/facebook-source-code-leaked/

It became a big deal:

http://www.techmeme.com/070812/p1#a070812p1

The two files are index.php (the homepage) and search.php (the search page)

mitchellporter

//: Playground - noun: a place where people can play

import UIKit

class Mento: UIView {

    // The thickness ratio of our mento, 1.0 being a perfect sphere.
    let mentoThicknessScale: CGFloat = 0.60

    let shape: UIView = {

mitchellporter

Default

Powerlevel10k

mitchellporter

Automatic build versions from git in Xcode (and other goodies)

Installation procedure for pre-build actions to automatically populate Xcode Info.plist with dynamic data.

1. Xcode Scheme pre-action

Edit Xcode Scheme and add a pre-action script. Copy the contents of preaction.sh into the pre-action script box.

mitchellporter

iOS Interview Questions

Sources include, but not limited to:

• https://izeeshan.wordpress.com/2015/03/31/interview-stuff/
• https://github.com/9magnets/iOS-Developer-and-Designer-Interview-Questions
• https://www.quora.com/What-do-startups-look-for-in-a-candidate-during-an-iOS-technical-interview-What-do-they-want-to-hear
• https://www.linkedin.com/pulse/ios-interview-questions-senior-developers-alex-bush
• https://www.raywenderlich.com/110982/swift-interview-questions-answers

In Swift, what is the difference between a struct and a class?

mitchellporter

Two way iframe communication

The main difference between the two pages is the method of sending messages. Recieving messages is the same in both.

Parent

Send messages to iframe using iframeEl.contentWindow.postMessage Recieve messages using window.addEventListener('message')

iframe

mitchellporter

/* 
  To test things out, in your JavaScript console, use selector followed by
  .css('outline','1px solid red');
  to see what you get.
  A sandbox to test all this:
  https://shopify-selectors.myshopify.com/admin/themes
*/

/*====================================
  Product Page and Quick View