vb.net print barcode labels Creating advanced view controllers in Objective-C

Create Quick Response Code in Objective-C Creating advanced view controllers

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Creating advanced view controllers
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Based Application template s last trick. In the future, we ll jump straight to the appropriate template for each sort of view controller starting with the tab bar controller template.
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It s even easier to create a tab bar view controller using the existing tab bar template. Select Tab Bar Application when you create a new project. This template sets you up with a tab bar controller much like the one you just created by hand, except it does three additional things: The template defines the tab bar controller as an IBOutlet, giving the app delegate access to the object IBOutlet UITabBarController *tabBarController;. The template creates the view controller for the first window as part of a special FirstViewController class. You ll probably want to have an individual view controller class for each tab to take care of events on a per-page basis, but that s easy to change by adding class files and adjusting the Identity tab for the view controllers. For now, leave things as they are so that we can examine how to work with the default template setup. The template associates a second .xib file with the second view. It does this in a way you ve seen before: by defining a nib Name for the view controller inside Interface Builder. For the rest of this section, we ll assume that you re working with this prebuilt tab bar controller template as your tabex project. With a working tab bar controller in hand, you can begin programming multiple pages of screens.
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TAB BARS AND TOOLBARS
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The UIKit supports two similar interfaces, the UITabBar and the UIToolBar. They each include a strip of icons that goes along the bottom of the screen. Their main difference is in functionality. The UITabBar is intended as a modal interface that changes the selections when they re tapped (usually with a permanent highlight). The purpose of the UIToolBar is to provide a menu of possible actions that don t change the appearance of the selection when tapped (except with a temporary highlight). Despite their similar appearance, the two items share no inheritance other than a common ancestor in UIView. Consider it convergent evolution. We ll present a fully functional example of a UIToolBar in chapter 11.
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Building a tab bar interface
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At this point, you have a tab bar controller that contains two tabs, each of which has relatively empty content. You also have tabs on your tab bar without pictures and without meaningful names. To build your tab bar interface, you ll want to adjust all these things.
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The tab bar view controller
ADDING MORE TABS
In Interface Builder, you add tabs to the tab bar by going to the Attributes tab of the tab bar controller and clicking the plus sign (+) in its view controller area. A tab bar item and related view controller are added to the right side of your bar. Go ahead and create a third tab by clicking the +. To allow for easy access to this new controller s view, you should create a new .xib file and connect the view controller to it. Both of these procedures were described at the end of chapter 4.
CONNECTING VIEWS
When you have the right number of tabs, you can connect views to each of the tab bar s view controllers. This can be done in three major ways: You can input views through .xib files, as noted earlier. If a view controller has its own class file, you can add views through the loadView or viewDidLoad method for that class. If a view controller doesn t have its own class file, you can load views elsewhere, such as in the app delegate s applicationDidFinishLaunching:. We offered several examples for the first two ways to load views (including plenty of Interface Builder examples in chapter 4 and viewDidLoad: examples in chapter 5), so we won t repeat those methods here. Instead, because the latter two view controllers don t have their own class files, you ll see how to create their views using applicationDidFinishLaunching:. It would probably be simpler to create their views in Interface Builder, but this example will demonstrate how you can use the tab bar controller. Although you don t have outlets for the controllers, you can link to them straight from the tab bar controller object, which you do have access to, thanks to that IBOutlet that you ve already seen. This relates to a concept we discussed when talking about basic view controllers in chapter 5; because view controllers have to do MVC management, they should give you easy access to related objects. Within the tab bar controller is a viewControllers property, which is an NSArray list of the view controllers that a tab bar controller contains. Listing 7.1 shows how to access this information and programmatically build a couple of views for the second and third controller within tabexAppDelegate.m. This is the skeleton of a simple program that lets you edit a text view in the first window, keep a count of what you ve written in the second, and search in the third.
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