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Let s take a look at the touch methods. First, in touchesBegan:withEvent:, we determine the point that the user is currently touching and store that value in lastPreviousPoint and lastCurrentPoint. Since this method is called when a gesture begins, we know there is no previous point to worry about, so we store the current point in both. We also reset the running line length count to 0. Then, in touchesMoved:withEvent:, we calculate the angle between the line from the current touch s previous position to its current position, and the line between the two points stored in the lastPreviousPoint and lastCurrentPoint instance variables. Once we have that angle, we check to see if it falls within our range of acceptable angles and check to make sure that the user s finger has traveled far enough before making that sharp turn. If both of those are true, we set the label to show that we ve identified a checkmark gesture. Next, we calculate the distance between the touch s position and its previous position, add that to lineLengthSoFar, and replace the values in lastPreviousPoint and lastCurrentPoint with the two points from the current touch so we ll have them next time through this method. Compile and run, and try out the gesture. When defining new gestures for your own applications, make sure you test them thoroughly, and if you can, have other people test them for you as well. You want to make sure that your gesture is easy for the user to do, but not so easy that it gets triggered unintentionally. You also need to make sure that you don t conflict with other gestures used in your application. A single gesture should not count, for example, as both a custom gesture and a pinch.

Summary

Gar on Check, Please!

Figure 3-18. Displaying the folder contents If another e-mail is received with the same subject, its attachments are stored in the same folder.

Well, you should now understand the mechanism the iPhone uses to tell your application about touches, taps, and gestures. You also know how to detect the most commonly used iPhone gestures and even got a taste of how you might go about defining your own custom gestures. The iPhone s interface relies on gestures for much of its ease of use, so you ll want to have these techniques at the ready for most of your iPhone development. When you re ready to move on, turn the page, and we ll tell you how to figure out where in the world you are using Core Location.

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our iPhone has the ability to determine where in the world it is using a framework called Core Location. There are actually three technologies that Core Location can leverage to do this: GPS, cell tower triangulation, and Wi-Fi Positioning Service (WPS). GPS is the most accurate of the three but is not available on first-generation iPhones. GPS reads microwave signals from multiple satellites to determine the current location. Cell tower triangulation determines the current location by doing a calculation based on the locations of the cell towers in the phone s range. Cell tower triangulation can be fairly accurate in cities and other areas with a high cell tower density but becomes less accurate in areas where there is a greater distance between towers. The last option, WPS, uses the IP address from iPhone s Wi-Fi connection to make a guess at your location by referencing a large database of known service providers and the areas they service. WPS is imprecise and can be off by many miles. All three methods put a noticeable drain on iPhone s battery, so keep that in mind when using Core Location. Your application shouldn t poll for location any more often than is absolutely necessary. When using Core Location, you have the option of specifying a desired accuracy. By carefully specifying the absolute minimum accuracy level you need, you can prevent unnecessary battery drain. The technologies that Core Location depends on are hidden from your application. We don t tell Core Location whether to use GPS, triangulation, or WPS.

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