.net barcode sdk free Life Cycle Methods added to FirstViewControllerm in Objective-C

Generator QR-Code in Objective-C Life Cycle Methods added to FirstViewControllerm

Life Cycle Methods added to FirstViewControllerm
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-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation) interfaceOrientation { return YES; }
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- (void)didReceiveMemoryWarning { NSLog(@"received memory warning"); [super didReceiveMemoryWarning]; } - (void)viewDidLoad { NSLog(@"view did load"); [super viewDidLoad]; } - (void)viewWillAppear:(BOOL)animated { NSLog(@"view will appear"); } - (void)viewDidUnload { NSLog(@"view did unload"); } - (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation) fromInterfaceOrientation { NSLog(@"view rotated"); }
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[Session started at 2009-06-18 07:19:59 -0400] 2009-06-18 07:20:07503 SimpleView[267:20b] view did load 2009-06-18 07:20:10815 SimpleView[267:20b] Click Me 2009-06-18 07:20:15293 SimpleView[267:20b] Received simulated memory warning 2009-06-18 07:20:15294 SimpleView[267:20b] received memory warning 2009-06-18 07:20:33478 SimpleView[267:20b] view rotated
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Hey, wait a minute What does shouldAutoRotateToInterfaceOrientation: mean in Listing 7-7 This method is for allowing or disallowing a view to rotate To allow a view to rotate, return YES To disallow, return NO
iPhone SDK Programming: A Beginner s Guide
Summary
This chapter discussed the UIView and UIViewController classes When developing an iPhone application, every content view should have its own nib Remember, placing views in their own nib conserves memory by only loading the components needed to render the current view The development pattern for creating a view is straightforward: Subclass a UIViewController in Xcode Create the UIView in its own nib Then, in the nib, connect the view to the view controller To make your code easier to test and debug, keep the name consistent between the view, view controller, and nib Implement any view-related life cycle methods you wish to handle in the view s view controller Keep your custom code to a minimum, though remember, the controller s job is to serve as glue code between your view and model Consider placing more advanced code in helper classes, and then have your controller use these helpers Now that you understand how to build each screen s content, you can learn how to develop views that aggregate your individual views into a multiple-screen application In the next chapter, you begin exploring multiview applications with the UITabBar and UITabBarController After learning about tab bars, you move to the navigation controllers and then tables These views let you aggregate content views into richer multiscreen applications
UITabBar and UITabBarController
iPhone SDK Programming: A Beginner s Guide
Key Skills & Concepts
Understanding tab bars Using the tab bar Application template Creating an Application that uses a tab bar Adding tabs to a tab bar Customizing a tab bar
tab bar consists of two or more tabs along a window s bottom Each tab contains a view controller As a user selects a tab, the tab loads its view controller, which in turn loads and displays its associated view In this chapter, you explore creating tabbed applications In the first task, you create a tabbed application using Xcode s Tab Bar Application template After examining this template s results, you manually add a third tab to the tab bar In the next task, you start with a Window-based Application template and create a two-tab application In this task, you solidify your understanding by manually duplicating the steps taken by the Tab Bar Application template The chapter s final task illustrates allowing users to customize a tab bar s tabs when it contains five or more tabs
UITabBar, UITabBarController, UITabBarItem, and UITabBarControllerDelegate
The tab bar is useful for presenting different application subtasks or different views of the same data If you own an iPhone or iPod touch, you are certainly familiar with a tab bar controller, as several applications use tab bars The Clock application, for instance, has a tab bar containing tabs with different subtasks (Figure 8-1) Each tab is a different subtask: World Clock, Alarm, Stopwatch, and Timer The iPod application illustrates a tab bar containing different views of the same data (Figure 8-2) The Artists tab organizes your multimedia by artist; the Album tab organizes your media by album Each tab is a different view of the same data, your iTunes multimedia The iPod application illustrates another tab bar feature When a tab bar has more than four tabs, it displays a More tab Upon pressing More, the tab bar presents the remaining tabs in a selectable list (Figure 8-3) You can also modify the iPod application s tab bar using the Edit button Clicking the Edit button displays the tabs in a view that allows you to modify which tabs are displayed in the tab bar (see Figure 8-3) When presented with an application that contains a task with multiple subtasks or an application that requires different views of the same data, use a tab bar
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