• This course has been retired. Users who have purchased the course will still have access to it, however it is no longer available for purchase.

Objective-C Programming

What should I do if my video will not play?

There are many things that can affect the quality of your video so we have put together these instructions to help you review all the things that need to be tested in order to trouble-shoot video quality.

The first thing we want to assure you is that we have done everything possible to make sure that our videos will play well.  Our videos are hosted in the cloud by Akamai.  Akamai has servers around the world to make sure that your videos are sent from the server that is closest to you.  By hosting our videos with Akamai we make sure that you receive the highest video quality. If you are experiencing video buffering or freezing at home or at the office there are a number of things you can do to help us troubleshoot.

  • Flash Not Enabled We require Flash to be enabled for certain features of the site. To enable Flash, please follow these steps for your browser:
  • Buffering: We provide you with three (3) speed choices that you can select when watching a video.  If the video is buffering then the first thing you want to click on a slower speed option found at the bottom of the video window. Try clicking on Medium and Low and see if that allows the video to play without buffering. If it does not, please read through the rest of this FAQ and follow the steps outlined below.
  • Video will not play: In order to play our videos, you have to have Adobe Flash Player installed. If you click on the video and nothing happens, then you do not have Adobe Flash Player installed.  Click on this link to download and install it.
    • If you have Adobe Flash Player installed and your video is not playing, complete the following steps:
      • Go to your course page, select a video, and click play.
      • Once the video begins playing, place your mouse over the video and right click.
      • You will see the several links and the last link has the words “About Adobe Flasher Player xx.xx.xx” (version # you have).
      • Click here , where you will see your version and what is the latest version. You need to have the latest version installed.
      • If you do not have Adobe Flash Player, click here to download and install it.
  • Popup Blockers: Please check to make sure that your pop-up blocker is turned off when you go to our website. This will prevent the video window from opening.
  • Your Connection Speed: Internet speed needs to be 2.0 Mbps upload and download to successfully watch the videos.  You will want to check and see if your connection speed is 2.0 Mbps or higher.  You can do this by clicking on this link and running a speed test.
  • Jitter and Packet Loss: Your Jitter rate lets us know if your connection speed is consistent while your Packet Loss rate lets us know if your internet connection could be losing pieces of the video.
    • Go to https://www.dotcom-tools.com/ping-test.aspx to determine if there is any Jitter or Packet Loss on your connection.
    • This is measured by a letter scale with A being the best.
      • If your Packet Loss is below a B, your connection is losing pieces of the video and causing the video to skip.
      • If your Jitter is below a B, your connection speed is very inconsistent and may be changing while you are watching the video which will result in buffering issues.
      • If either of these is the case you will need to contact your internet provider.
  • Ports: You will need to have ports 1935, 443 and 80 open. You can run a port test at this link.
    • If you are watching from work and those ports are not open, check with your IT department.
  • Shared Internet Connection: If you are on a shared internet connection, test playing videos during non-peak hours when usage by others on your network is low.
  • Reset Your Browser: If you've tried all the previous steps, your browser may be retaining data that needs to be deleted, and this requires a reset. If you are using Chrome, use the instructions in this link to reset your browser. If you are using Internet Explorer (IE) you may need to reset it. You can do this by clicking on the cog icon on the top right of your page. Then click on tools, internet options, advanced and reset. If you are using Firefox, use the instructions in this link to reset your browser.
  • Other things to check:
    • At home or at work, test using different browsers and computers to see if you get the same result.
      • Make sure you have the latest version of the browser you are using.
    • If you are using Internet Explorer (IE) you may need to reset it. You can do this by clicking on the cog icon on the top right of your page. Then click on tools, internet options, advanced and reset.
    • Try from a different location using a different network.
    • If you are on a wireless connection try a wired solution.
    • If you are on a home network:
      • Test playing the videos when you are the only user on the network.
      • Try by-passing your router to eliminate it as the point of failure. A direct plug from your ISP to your computer will take care of this and will make sure that neither your router nor other users are affecting your connection.
    • If you are running Firefox, you can check your plugins here: https://www.mozilla.org/en-US/plugincheck/
  • Make sure you do not have any other programs open. File sharing and peer to peer sharing programs, even when limited to low bandwidth, can make it almost impossible to stream properly.
  • Tracking Progress on Mobile Devices: The GogoTraining site is designed to use the native player found in your browser. If you are taking your course on a mobile device and want to make sure your progress is tracked, then you will need to play the videos from the native player that is in your browser. Do not download any third party apps to play the videos as they do not allow your progress to be recorded. If you have installed a third party app and want to receive a Course Completion Certificate, then you will need to uninstall the 3rd party app or see if the app has the ability for you to disable it for certain sites.
  • Submitting Debugging Information If you have tried everything else and still are having trouble viewing the videos, you can visit this page where you can help us debug your particular setup by following the instructions on the page and submit the debugging information to us.
Video Title
00: Objective-C Programming: Course Introduction
5 min
01:Setting Up
24 min
02: Setting Up Demo
8 min
03: Basics of C
22 min
04: Memory and Pointers - Part 1
30 min
05: Memory and Pointers - Part 2
19 min
06: Thinking in Objects
29 min
07: Basics of Objective-C
27 min
08: Basics of Objective C Demo
7 min
09: More Objective-C Part 1
26 min
10: More Objective-C Part 2
30 min
11: Core Foundation Value Classes
29 min
12: Basic Controls - Part 1
30 min
13: Basic Controls - Part 2
28 min
14: Designing Applications Using MVC - Part 1
21 min
15: Designing Applications Using MVC - Part 2
16 min
16: Custom Views and Drawing Part 1
15 min
17: Custom Views and Drawing Part 2
19 min
18: Custom Views and Drawing Part 3
25 min
19: Custom Views and Drawing Part 4
22 min
7 hrs 12 mins

Michael L. Simpson

Mr. Simpson's career as a Knowledge Engineer, developer and instructor have afforded him the opportunity to develop a unique set of skills for assembling, interpreting, managing and disseminating knowledge. Mr. Simpson has created almost one hundred weeklong training courses in diverse technical areas and supervised the development of over fifty others. He has conducted extended knowledge acquisition interviews of senior engineering and technical staff, completed assessments of technical knowledge acquisition and knowledge transfer situations, and written extensive responses to commercial and military bids. He has managed the development and monitored the performance of hundreds of classroom instructors and achieved consistent, on-time and on-budget deliveries in challenging environments and difficult situations. Mr. Simpson has over seventeen years of experience managing and supervising the development of instructors, and an additional ten years of experience in development and delivery of customized, high-quality training materials. He has deep, broad experience in assessing situations that require instruction and knowledge transfer, developing assessments to establish a baseline level of knowledge for prospective students, performing object-oriented analysis, design, and business-process reengineering tasks, creating training programs that are appropriate for adult professional education, estimating the development time and delivery costs for creating software programs and associated training, managing the development and delivery of that instruction, and conducting post-training assessments to certify and quantify the results of this training. Mr. Simpson's diverse technical background allows him to quickly determine a client's needs; design training to meet those needs; and manage the development and delivery of cost-effective, client-centered training.

System Requirements


Current late-model Macintosh running OS X 10.8 or later

It is possible to set up a virtual Mac environment on a Windows PC running Windows 7 or later. however Apple only officially supports Xcode / Objective-C / iOS 7 development on Macs. In order to develop Mac programs on a PC, you have to first construct a Mac "environment" on the PC. (That's what VirtualBox and the Mac operating system are for.) Here are some recommended suggestions on how to create a virtual environment. These are not exhaustive and are only suggestions as there may be other options available. Please note that this approach is not supported however it is possible to find websites that can provide further insight and troubleshooting.

  1. Download the free VirtualBox hosting environment and the "Niresh" distribution of Mac OS X Mavericks 10.9 as documented here. This link also documents the procedures for installing VirtualBox on a 64-bit Windows machine and installing OS X Mavericks 10.9 in your VirtualBox environment.
  2. Download the free XCode development environment as documented here. This link also documents the procedure for setting up Xcode, structuring an iOS application, implementing an iOS application, and finding information about iOS technologies.


OS X 10.8 or later

Xcode software development kit (SDK) 4 or later – while this course uses version 4.5.1. the current version will enable you to successfully complete the course.

Course Materials

When you purchase this course you will receive access to these materials.

  • Student Guide
  • Exercise Guide
  • Foundation Value Classes - Definitions (used in Module 09)
  • Custom Views Drawing and Program Code Examples (used in Modules 14 & 16)

Course Links

These links are activated when you purchase this course.

  • Course Survey


This course comes with a Transcript that tracks your progress. You can use your transcript to view and monitor your progress and when you complete the course, you can print or email the transcript, or print a course completion certificate.

Certificate of Completion

You will be awarded a Certificate of Completion when you finish this course. You will be able to print or email the certificate and share your accomplishment with everyone.