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#import "SimpleViewViewControllerh" @implementation SimpleViewViewController @synthesize theLabel; - (IBAction) changeLabelValue : (id) sender { [theLabel setText:@"Hello World"]; UIButton *theBut = sender;
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NSLog(theButcurrentTitle); theButenabled = NO; [theBut setTitle:@"Pressed Already" forState: UIControlStateDisabled]; } - (void)dealloc { [theLabel release]; [super dealloc]; } @end
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Take a moment to examine what the View-based Application template did for you It created the SimpleViewViewControllerxib and it also created a UIViewController subclass, SimpleView ViewController, by creating the SimpleViewViewControllerh and SimpleViewViewControllerm files Moreover, it added the controller to the delegate (Listing 7-3) In the delegate, the template created the application s window and view controller as outlets (Listings 7-3 and 7-4) In the delegate s applicationDidFinishLaunching: method, the template added the view controller s view to the window and then displayed the window Notice that nowhere does the code allocate or initialize its window or view controller Instead, the Infoplist specifies that MainWindowxib is the application s main nib, so it knows to load the MainWindowxib and the nib handles window and view controller initialization In the MainWindow nib, the template set the nib s file s owner to UIApplication The template set SimpleViewAppDelegate as the application s delegate and set the delegate s window to the window in MainWindowxib The template also added a view controller to MainWindowxib and set it as the delegate s root view controller Every delegate must have a root view controller The root view controller in MainWindowxib comes from the SimpleViewViewControllerxib, also created by the template The template created the UIView in its own xib, SimpleViewViewControllerxib It set SimpleViewViewControllerxib s file s owner to SimpleViewViewController It also set the controller s view to the view in the xib Listing 7-3 SimpleViewAppDelegateh
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#import <UIKit/UIKith> @class SimpleViewViewController; @interface SimpleViewAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; SimpleViewViewController *viewController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet SimpleViewViewController *viewController; @end
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Listing 7-4
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SimpleViewAppDelegatem
#import "SimpleViewAppDelegateh" #import "SimpleViewViewControllerh" @implementation SimpleViewAppDelegate @synthesize window; @synthesize viewController; - (void)applicationDidFinishLaunching:(UIApplication *)application { [window addSubview:viewControllerview]; [window makeKeyAndVisible]; } - (void)dealloc { [viewController release]; [window release]; [super dealloc]; } @end
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Using a Window-based Application Template
The View-based Application template hides many development details If new to iPhone programming, chances are the View-based Application template does not help clarify a UIView, UIViewController, and their relationship To help make their relationship clearer, you should understand what the View-based Application template accomplishes automatically Unlike a View-based Application template, a Window-based Application template requires understanding UIViews and UIViewControllers When using the Window-based Application template, you must manually create a view and view controller and wire them together In this project, you create a single view application starting with a Window-based Application template Creating a Window-based Application should solidify your understanding of the steps behind its creation
1 Create a new Window-based Application and name it SimpleWindow 2 Highlight Resources and create an empty xib Name the xib FirstViewControllerxib 3 Highlight Classes and add a UIViewController named FirstViewController Xcode should
have created FirstViewControllerh and FirstViewControllerm Be certain the checkbox to create a xib is not checked
4 Open SimpleWindowAppDelegateh and import the FirstViewController Add a
UIViewController property to SimpleWindowAppDelegateh so it appears the same as Listing 7-5
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iPhone SDK Programming: A Beginner s Guide
5 Modify SimpleWindowAppDelegatem so it appears like Listing 7-6 Notice you must
synthesize rootViewController and add its view to the window as a subview in the delegate s applicationDidFinishLaunching: method
6 Build the application This step is important, if you do not build or save the changes, any
added actions or outlets will not appear in Interface Builder
7 Open FirstViewControllerxib in Interface Builder Open the document window and notice
that the File s Owner isn t set Also notice there is no UIView
8 Drag a view from the library to the document window Change the view s color 9 Select File s Owner and change its class to FirstViewController in the Object Identity
Inspector pane
10 Click the Connections Inspector and connect the view outlet to the view you added to the
document window
11 Save and close the FirstViewController s document window Open MainWindowxib in
Interface Builder
12 Notice that there is no UIViewController or view set in the document window 13 Drag a view controller from the library to the document window (Figure 7-1)
Figure 7-1
Adding FirstViewController to Mainwindowxib
7:
UIView and UIViewController
Figure 7-2
Setting Mainwindowxib s root view controller
14 In the view controller s inspector, change its NIB Name to FirstViewController and its type
to FirstViewController
15 Select Simple Window App Delegate in the document window In its connections
inspector, notice the rootViewController outlet Connect this to the view controller just added (Figure 7-2)
16 Save and quit Interface Builder 17 Click Build And Go to run the application The view in FirstViewControllerxib is loaded
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