how to print barcode in vb.net 2008 Creating another view controller in Objective-C

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Creating another view controller
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Creating another view controller is simple. First, in Interface Builder, drag a view controller from the Library to your xib document window. Alternatively, in Xcode, you can alloc and init an object from the UIViewController class.
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NOTE Increasingly, we ll assume that you re doing work through IB and using appropriate templates. But the same methods for object creation that you learned in the last couple of chapters remain available for all objects.
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Second, note that the previous IBOutlet command shows that the controller isn t instantiated directly from the UIViewController class. Rather, it s instantiated from
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Creating basic view controllers
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its own subclass, which has its own set of files (viewexViewController.{h|m}), named after the example project s name. This is standard operating procedure. Because you want a view controller to do event management, you ll often need to modify some of the controller s standard event methods, so you require your own subclass. To start, the view controller class files are mostly blank, but Xcode helpfully highlights a number of standard view controller methods that you may want to modify. After you ve finished creating a bare view controller, you re mostly ready to go. But you have a slight opportunity to modify the view controller for your specific program, and that s what we ll cover next.
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Building up a view controller interface
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In order to correctly use a view controller, you need to build your view objects as subviews of the view controller, rather than subviews of your main window or whatever else lies above it. This is easy in both Xcode and Interface Builder.
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The view controller class file gives you access to a pair of methods that can be used to set up your view controller s views. If the view controller s view is linked to a .xib file, you should use viewDidLoad, which will do additional work after the .xib is done loading; if it isn t created from inside Interface Builder, you should instead use loadView. Before you do any of this, your view controller will always start off with a standard UIView as its one subview. But by using these methods, you can instead create the view controller s view as you see fit, even creating a whole hierarchy of subviews if you desire. The following code adds a simple UILabel to your view controller using viewDidLoad. We ve chosen a humongous font that is automatically sized down so that later we can show off how rotation and resizing work:
- (void)viewDidLoad { [super viewDidLoad]; UILabel *myLabel = [[UILabel alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; myLabel.adjustsFontSizeToFitWidth = YES; myLabel.font = [UIFont fontWithName:@"Arial" size:60]; myLabel.textAlignment = UITextAlignmentCenter; myLabel.text = @"View Controllers!"; Connects label myLabel.backgroundColor = [UIColor grayColor]; as subview [self.view addSubview:myLabel]; [myLabel release]; }
The self.view line is the only one of particular note B. It connects your label object as a subview of the view controller s UIView. This example is also noteworthy because it s the first time you ve definitively moved outside of your app delegate for object creation. You could have done this object creation in the app delegate, but that s often sloppy programming because this needs to be done in the view controller. Now that you have view controllers, you ll increasingly do your work in those class files. This not only better abstracts your object
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The standard view controller
creation but also kicks off your support of the MVC model, because you now have controllers instantiating the views they manage. Watch for a lot more of this in the future. We ll also briefly return to the viewDidLoad and loadView methods when we talk about the bigger picture of the view controller lifecycle, shortly.
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