3: What s Next in Objective-C

Printing Code 39 Extended in Objective-C 3: What s Next

CHAPTER 3: What s Next
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An Introduction to the Code
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Before examining specific pieces of code and the way we will create the apps set forth in this chapter, we need to spend a moment assessing our approach. We will be going through the material in this chapter a little differently than in the previous chapters. I have included short bursts of information about each step, but without the details of the previous instructions. You will see many similarities between the functions and methods we are going to use in this next program and ones we utilized previously. If you need to go back and look at the detailed instructions, that is perfectly OK. It is for the sake of streamlining and saving space that I am giving fewer detailed instructions on the oft-repeated steps. Another difference is that, after you have completed the upcoming program, we will do a code review. This section will appear after each major example throughout the remainder of the book, and we will call it Digging the Code. In these reviews, we will go over some of the code we have written, and I will reference familiar code and explain processes in more detail. Here, I will begin to introduce you to more technical terms that you will use in future chapters and in correspondence with other programmers. Consider this analogy: Thus far, I have taught you how to get into a car, turn the ignition, press on the accelerator, and steer as you move forward. In this chapter, I will guide you with similar directions, but in a different model of automobile on the way to a new destination with fewer detailed instructions. After we get to our destination, I will open the hood and show you how, when you pressed the accelerator, it pumped gasoline into the engine, or how, when you pressed the brakes, it activated the disc brakes. By 8, we will go into the amount of gasoline being squirted into the pistons by the carburetors, and we will discuss how the brake pads heat up when going at a particular speed, and so on. Guess what you ll be able to handle it! So let s get on with the next application. Be ready to go back with me to review lines of your input as we focus on certain portions of the code, and as we look at how it all works together.
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CHAPTER 4: An Introduction to the Code
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004_helloWorld: Buttons with Graphics
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As indicated in 3, we will now embark on a journey in which we will explore the four categories of iPhone and iPad apps, abbreviated as INDIO: Interaction, Navigation, Data, and I/O. Our fourth example is very similar to the elementary Hello World! programs we have been creating so far, except that it shows how to do something that is not as intuitive as it may seem at first glance how to handle buttons and graphics. One of the ways I make sure I learn the names of all my students is to have them include photographs of themselves in one of the exercises. The students are told they must paste the pictures as the background to a simple Hello World! app. Invariably, they all think this is far too easy for them. It turns out that not only is there a struggle with sizing and placing the images on their apps, but then they also hide their code with the picture once they have it on there. In this project, I have created a picture just as I ask my students to do, and I have placed it as a type of wallpaper. So when they place their faces in the appropriate spot, their photographs say Hello to me and tell me who they are. This exercise goes step by step through this process so that you can do the same thing with your photo. It will get a little tricky at times, so follow along carefully. Try not to fall into the trap of thinking that you can skip steps because you ve already practiced on a significant portion of the initial code. Take a deep breath, relax, and go through each step. You will learn some valuable tools in this exercise. Everything you need is right here in this book: screenshots and step-bystep instructions. I want to remind you that all the screenshots are directly from my screencast, available at:
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