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In this chapter, we will explore one of the most remarkable aspects of the iPhone: its unique ability to switch seamlessly between one view and another We have all seen the wonderful iPhone and iPad ads on television, in which a person s fingers direct an amazing flow of vivid images, within interactive applications, and cause one view to just slide or roll directly into another, giving the impression of performance art The concept behind this is what Apple calls Switch View methodology As a professor of computer science, I have learned of several pitfalls regarding the teaching and learning of the Switch View methodology I intend to take advantage of the interesting variety of results that I have experienced as I have presented my students with some of the shortcuts those smart people at Apple have given us.

Extrapolates the business logic of the application Maintains the application state Provides access to functions of the application Manages persistence Extracts data for the View component Informs interested parties of changes to data Extrapolates data presentation Responds to users with data Maintains consistency with Model data Extrapolates user interaction/ application semantic map Transforms user actions into application actions Determines the appropriate data display based on user input and context

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We call this commutation relation the Virasoro algebra with central extension. The central charge is the space-time dimension D which has shown up in the second term on the right-hand side. This is also the number of free scalar elds on the worldsheet. It is clear that if m = 0, 1 the central extension term will vanish. This singles out L1 , L0 , and L 1 which form a closed subalgebra. We call this the SL (2, R) algebra. The Virasoro operators can be used to eliminate unphysical states (i.e., negative norm states) from the theory by requiring that the expectation value of L0 a vanishes for a physical state . That is, we impose the constraint

Informs the View when it makes changes to the application data Can be queried by the View Gives the Controller access to application functionality

Lm a m ,0 = 0

Provides Model data for the user Refreshes display when informed of data changes by the Model Transfers user input to the Controller Transforms user inputs and dispatches class logic or application actions on the Model Selects the View to present based on user input and Model action outcomes

As I introduce new concepts and techniques, I will be contrasting several tried-and-true pathways to the goal of creating an app with the capabilities I ve described Specifically, you will become familiar with the Tab Bar application template; it creates an Xcode SDK that lays everything out for a simple tab bar look and feel For our goal of coding switch views with multiple graphics, you will barely have to program anything the boilerplate code within the template does most of the work! Ironically, this easier and softer way was a disaster for some of my students I now realize that when too many shortcuts are taken, without due exploration of the underlying code, some programming students get confused.

for m 0. The term a m ,0 takes care of the fact that we only need the normal ordering constant a in the case of L0. To eliminate negative norm states, speci c conditions must be put on a and D, which is the origin of the extra dimensions in string theory. In particular, it can be shown that negative norm states can be eliminated if a =1 D = 26 (4.21)

n Where data must be viewed and manipulated in multiple ways n To facilitate maintenance n To support simultaneous, modular development by multiple developers n To allow division of labor by skill set n To facilitate unit testing n When employing enterprise beans that are reusable across applications

The reason that a = 1is chosen is a bit beyond the scope we want to cover in this book, see the references if interested in the proof. We can proceed further to obtain a mass operator. First recall that Einstein s equation tells us p p + m 2 = 0 m 2 = p p

MVC offers the following benefits:

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