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Asked in community. In practice, it is more likely that an application will need to display a variety of different content depending on the actions of the user. This is typically achieved by creating multiple views often referred to as content views and then providing a mechanism for the user to switch from one view to another.
In this chapter we will look at implementing a multiview application using a Tab Bar. The UITabBar is typically located at the bottom of the screen and presents an array of tabs containing text and an optional icon that may be selected by the user to display a different content view.
The iPod application, for example, presents a tab bar with options to display playlists, artists, songs and videos. Depending on the selection made from the tab bar, a different content view is displayed to the user. Multiview applications need a visual control that will be used by the user to switch from one content view to another, and this usually takes the form of a tab or navigation bar. Both of these components are also views and as such need to have a view controller.
In the context of a multiview application, this is known as the root controller and is responsible for controlling which content view is currently displayed to the user. Regardless of the origins of your chosen root controller, it is the first controller that is loaded by the application when it launches. Since this chapter is dedicated to the creation of a tab bar based application we will be using an instance of the UITabBarController as our root controller. The first step in creating our example application is to create a new Xcode project.
To do so, launch Xcode and select the option to Create a new Xcode project. On the resulting template panel select the Window-based Application option. On the next screen name the product TabBar, make sure that Device Family is set to iPhone and that Use core data for storage option is turned off.
The first new class we are going to add to our project is the root controller. In the project navigator panel, select the TabBarAppDelegate. Now that we have made the appropriate additions to the app delegate subclass we can add the root view controller to the project. Add a Comment.
So you have firstWindow, below secondWindow Where do you call the alert? Inside secondWindowController? Posted by Claude
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