how to create barcode in vb.net 2010 Modify SimpleWindowAppDelegatem so that it appears like Listing 7-6 Notice you in Objective-C

Drawer Denso QR Bar Code in Objective-C Modify SimpleWindowAppDelegatem so that it appears like Listing 7-6 Notice you

5 Modify SimpleWindowAppDelegatem so that it appears like Listing 7-6 Notice you
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must synthesize rootViewController and add its view to the window as a subview in the delegate s applicationDidFinishLaunching: method Listing 7-6 SimpleWindowAppDelegatem
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#import "SimpleWindowAppDelegateh" #import "FirstViewControllerh" @implementation SimpleWindowAppDelegate @synthesize window; @synthesize rootViewController; -(void)applicationDidFinishLaunching:(UIApplication *)application { [window addSubview:rootViewControllerview]; [window makeKeyAndVisible]; } -(void)dealloc { [window release]; [rootViewController release]; [super dealloc]; } @end
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UIView and UIViewController
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6 Select FirstViewControllerxib to display it in Interface Builder Select the File s Owner
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and then select View | Utilities | Identity from the main menu Notice that the class of the File s Owner isn t set
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7 Change its class to FirstViewController from the pull-down in the Object Identity Inspector
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8 Select the view, select Object Attributes in the Inspector pane, and change the view s color 9 Select the File s Owner and click the Connections button in the Inspector pane, and then
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connect the view outlet to the view you added to the document window
10 Save FirstViewControllerxib and select MainWindowxib to open it in Interface Builder 11 Notice that there is no UIViewController or view set in the document window 12 Scroll down in the list of objects and drag a view controller from the library to the editing
pane With the View Controller selected, go to the Object Identity Inspector pane and set its class to FirstViewController (Figure 7-1)
Figure 7-1
Adding FirstViewController to Mainwindowxib
(continued)
iOS SDK Programming: A Beginner s Guide
13 In the Object Attributes Inspector pane, change its NIB Name to FirstViewController 14 Select Simple Window App Delegate (one of the icons to the left of the editing pane)
Select the Connections Inspector pane; notice the rootViewController outlet Connect this to the view controller just added (Figure 7-2)
15 Save your changes 16 Click Run to build and run your application The view in FirstViewControllerxib will be
loaded into the window and displayed In Step 14, you connected the FirstViewController to the application s delegate This was an important step; it allowed the nib to set the delegate s root view controller for you The root view controller is the UIViewController that is first loaded by an application delegate Remember, the application knew to load MainWindowxib because it was in the application s Infoplist The application loaded MainWindowxib, saw the FirstViewController object that was added to the document window, and saw that the
Figure 7-2
Setting Mainwindowxib s root view controller
7:
UIView and UIViewController
delegate s root view controller was set to FirstViewController The application also knew the controller came from FirstViewControllerxib Because of the object, variable, and nib settings, the application knew to allocate and initialize a FirstViewController instance from FirstViewControllerxib when loading MainWindowxib Because these relationships were established in Interface Builder, no manual code was necessary This is how the View-based Application template builds a simple application, which you just duplicated manually using the Window-based application template
NOTE
In this example, you manually created a xib and linked it to its associated view controller Step 3 specifically instructed you not to check the check box that also created a xib; had you checked the check box, Xcode would have created a xib and automatically made most of these connections for you
Ask the Expert
Q: A:
Hey, wait a minute What does the @class precompiler directive mean in Listing 7-3 and Listing 7-5, and why are you not importing the class s header The @class is a compiler directive that informs the compiler that a class of that type will exist It is what s called a forward declaration, so named because it is informing the compiler before the class is actually declared Using an @class directive in the header file and only importing the class s header in the implementation file is the preferred approach
UIViewController and Application Life Cycle Events
UIViewController handles important life cycle events for its associated UIViews Table 7-2 lists the UIViewController s view life cycle instance methods Note that several methods in Table 7-2 are similar to an application delegate s life cycle methods for instance, the didReceiveMemoryWarning: method Do not let this similarity confuse you; remember, life cycle methods in the view controller are for the controller s associated view and not the application as a whole Conversely, life cycle methods in the delegate are designed to handle events for the application as a whole
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