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THE SOURCE CODE FILE
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Listing 11.3 displays the application delegate s source code file, helloworldxcAppDelegate.m, and it s here that you re going to end up placing your new code.
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Listing 11.3 The Application Delegate object that contains your startup code
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#import "helloworldxcAppDelegate.h" @implementation helloworldxcAppDelegate @synthesize window;
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B C E
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- (void)applicationDidFinishLaunching:(UIApplication *)application { [window makeKeyAndVisible]; } - (void)dealloc { [window release]; [super dealloc]; } @end
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The source begins with an inclusion of the class s header file B and an @implementation statement C. Your window property is also synthesized D. It s the content of the applicationDidFinishingLaunching method E that s really of interest to you. As you ll recall, that s one of the iPhone OS life-cycle messages that we touched on in chapter 10. Whenever an iPhone application gets entirely loaded into memory, it ll send an applicationDidFinishingLaunching: message to your application delegate, running that method. You ll note there s already some code to display that Interface Builder created window F.
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For this basic project, you ll add all your new code to this same routine such as an object that says Hello, World!
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11.2.3 Writing Hello, World!
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We ve been promising for a while that you re going to be amazed by how simple it is to write things using the SDK. Granted, your Hello, World! program may not be as easy as a single printf statement, but nonetheless it s pretty simple considering that you re dealing with a complex, windowed UI environment. As promised, you ll be writing everything inside the applicationDidFinishingLaunching method, as shown in listing 11.4.
Listing 11.4 The iPhone presents Hello, World!
- (void)applicationDidFinishLaunching:(UIApplication *)application { [window setBackgroundColor:[UIColor redColor]];
B C D
CGRect textFieldFrame = CGRectMake(50, 50, 150,40); UILabel *label = [[UILabel alloc] initWithFrame:textFieldFrame]; label.textColor = [UIColor whiteColor]; label.backgroundColor = [UIColor redColor]; label.shadowColor = [UIColor blackColor]; label.font = [UIFont systemFontOfSize:24]; label.text = @"Hello, World!"; [window addSubview:label]; [window makeKeyAndVisible]; [label release]; }
Since this is your first look at real live Objective-C code, we re going to examine everything in some depth.
ABOUT THE WINDOW
You start off by sending a message to your window object, telling it to set your background to red B. You ll recall from our discussion of the header file that Interface Builder was what created the window. The IBOutlet that was defined in the header is what allows you to do manipulations of this sort. Note that this line also makes use of a nested message, which we promised you d see with some frequency. Here, you make a call to the UIColor class object and ask it to send you the red color. You then pass that on to your window. In this book, we re going to hit a lot of UIKit classes without explaining them in depth. That s because the simpler objects all have standard interfaces; the only complexity is in which particular messages they accept. If you ever feel as if you need more information about a class, you should look at appendix A, which contains short descriptions of many objects, or in the complete class references available online at developer.apple.com (or in Xcode).
Creating a first project in Xcode: Hello, World!
ABOUT FRAMES
You re next going to define where your text label is placed. You start that process off by using CGRectMake to define a rectangle C. Much as with Canvas, the SDK uses a grid with the origin (0,0) set at the top left. Your rectangle s starting point is thus 50 to the right and 50 down (50,50) from the origin. The rest of this line of code sets the rectangle to be 150 pixels wide and 40 tall, which is enough room for your text. You re going to be using this rectangle as a frame, which is one of the methods you can use to define a view s location.
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