That’s where you’ll see your output.īuild and run your application by clicking the Play button on the toolbar or selecting Run from the Product menu. On the toolbar, select the middle icon in the upper-right corner to reveal the debug area.Type your program into the edit window that appears in the rightmost pane. (You might need to reveal it from inside the folder that has the product’s name.) Highlight that file. In the left pane, you will see the file main.m.Select a name for your project folder and a directory to store your project files in.Fill in the other fields that appear on the sheet. Select a name for your application and set its Type to Foundation.For the type of application, select Application, Command Line Tool, and click Next.or choose Create a New Xcode Project from the startup screen. If this is a new project, select File, New, Project.The following summarizes the steps involved in creating a new program with Xcode: You’re now done with the procedural part of compiling and running your first program with Xcode (whew!). (Don’t worry if your comments don’t match.) Program 2.1 // First program example Your program in the edit window should now look like this. The lines that start with two slash characters ( //) are called comments we talk more about comments shortly. Make changes to the program shown in the edit window to match Program 2.1. You can edit your file inside this window.
The right pane of your Xcode project window shows the contents of the file called main.m, which was automatically created for you as a template file by Xcode and which contains the following lines: // Table 2.1 lists other commonly used filename extensions. m as the last two characters of the filename (known as its extension). Then you can decide how you want to work with your programs throughout the rest of this book.įigure 2.7 File main.m and the edit window Let’s go through the sequence of steps using both methods. You can both compile and run your program using Xcode, or you can use the Clang Objective-C compiler in a Terminal window. Program 2.1 // First program exampleīefore we go into a detailed explanation of this program, we need to cover the steps involved in compiling and running it. Without further ado, Program 2.1 shows an Objective-C program to accomplish this task. To begin, let’s pick a rather simple example: a program that displays the phrase “Programming is fun!” on your screen. We want you to understand the steps involved in keying in a program and compiling and running it. You won’t work with objects just yet that’s the topic of the next chapter. In this chapter, we dive right in and show you how to write your first Objective-C program.
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