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he iPhone screen, with its crisp, bright, 160 pixels per inch, touch-sensitive display, is truly a thing of beauty and a masterpiece of engineering. The iPhone s multitouch screen is one of the key factors in iPhone s tremendous usability. Because the screen can detect multiple touches at the same time and track them independently, applications are able to detect a wide range of gestures, giving the user power that goes beyond the interface. Suppose you are in the Mail application exploring your inbox, and you decide to delete an e-mail. You could tap the Edit button, select the row, and then tap the Delete button: that s three steps. Or you could just swipe your finger across the row you want to delete and then tap the Delete button that pops up two steps. This example is just one of the countless gestures that are made possible by iPhone s multitouch screen. You can pinch your fingers together to zoom into a picture or reverse pinch to zoom out. You can double-tap a frame in Mobile Safari to zoom so that the frame takes up your entire screen. You can swipe two fingers across a scrollable view, such as a long web page or e-mail message, and the view will scroll, up and down, along with your fingers. In this chapter, we re going to look at the underlying architecture that lets you detect gestures. You ll learn how to detect the most common ones and learn how to create and detect a completely new gesture.

Before we dive into the architecture, let s go over some basic vocabulary. First, a gesture is any sequence of events that happens from the time you touch the screen with one or more fingers until you lift your fingers off the screen. No matter how long it takes, as long as one or more fingers are still against the screen, you are still within a gesture (unless a system event, such as an incoming phone call, interrupts it). A gesture is passed through the system inside an event. Events are generated when you interact with the iPhone s multitouch screen and contain information about the touch or touches that occurred. The term touch, obviously, refers to a finger being placed on the iPhone s screen. The number of touches involved in a gesture is equal to the number of fingers on the screen at the same time. You can actually put all five fingers on the screen, and as long as they aren t too close to each other, iPhone can recognize and track them all. Now, there aren t many useful five-finger gestures, but it s nice to know the iPhone can handle one if it needs to. A tap happens when you touch the screen with a single finger and then immediately lift your finger off the screen without moving it around. The iPhone keeps track of the number of taps and can tell you if the user double-tapped or triple-tapped or even 20-tapped. It handles all the timing and other work necessary to differentiate between two single-taps and a double-tap, for example. It s important to note that the iPhone only keeps track of taps when one finger is used. If it detects multiple touches, it resets the tap count to one.

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WCF and the other frameworks that are part of the .NET Framework 3.0. Refer to the .NET Framework 3.0 Developer Center on the Microsoft Developer Network at http://msdn.microsoft.com/winfx/ to get the latest version. Refer to the appendix to get more details about the installation. Finally, refer to http://www.netfx3.com to get additional news, samples, and resources.

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Since gestures get passed through the system inside of events, and events get passed through the responder chain, you need to have an understanding of how the responder chain works in order to handle gestures properly. If you ve worked with Cocoa for Mac OS X, you re probably familiar with the concept of a responder chain, as the same basic mechanism is used in both Cocoa and Cocoa Touch. If this is new material, don t worry; we ll explain how it works. Several times in this book, we ve mentioned the first responder, which is usually the object with which the user is currently interacting. The first responder is the start of the responder chain. There are other responders as well. Any class that has UIResponder as one of its superclasses is a responder. UIView is a subclass of UIResponder and UIControl is a subclass of UIView, so all views and all controls are responders. UIViewController is also a subclass of UIResponder, meaning that it is a responder, as are all of its subclasses like UINavigationController and UITabBarController. Responders, then, are so named because they respond to system-generated events, such as screen touches.

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