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This code is broken into two parts. The addPic:at: method saves its information into an instance variable, adding a myPics dictionary to the NSMutableArray. Note that you have to convert values into NSNumbers so that you can place them in the dictionary. This method then calls setNeedsDisplay on the view. You should never call drawRect: directly. Instead, when you want it to be executed, call the setNeedsDisplay method, and everything else will be done for you. drawRect: is called shortly afterward. It reads through the whole NSMutableArray, breaks it apart, and draws each image onto the CALayer using the techniques you learned earlier. We haven t shown the few header files and the unchanged app delegate, but this is everything important needed to write a complete collage program.

It displays the URLs of the sites in which matches are found Although Search Crawler is a useful utility as is, its greatest benefit is found when it is used as a starting point for your own crawler-based applications..

This was one of our longer examples, but it could still bear some expansion to turn it into a fully featured application. First, it s a little unfriendly with memory. It would be better to maintain references to filenames, rather than keep the UIImages around. In addition, the NSArray that the CALayer is drawn from should be saved out to a file so it won t get lost if memory is low. But the program as it exists should work fine. The program could be made more usable. An option to crop the pictures would be nice, but it may require access to Core Graphics functions. An option to move pictures around after they ve been locked in would be relatively simple: you could test for touches in the collageView and read backward through the NSArray to find which object the user was touching. Reinstantiating it as a UIImageView would then be simple.

Despite the numerous applications for Web crawlers, at the core they are all fundamentally the same. Following is the process by which Web crawlers work:

The CPUs in the iPhone and iPod touch won t be mistaken for those of the Mac Pro, but they pack enough power that frequently they are waiting for something to do Multithreading can be used to keep the user interface responsive while working on other tasks in the background Gary demonstrates how to do this, and highlights traps to avoid along the way In 4, Canis Lupus (aka Matthew Rosenfeld) describes the development of the Keynote-controlling application Stage Hand, how the user interface evolved, and the lessons learned from that experience This knowledge is then demonstrated in a project showing how to recognize many complex gestures at once, including flicking (with inertia!) and rotating an object Remote controls should all be this handy Benjamin Jackson introduces us to two open source libraries in 5: cocos2d for 2D gaming, and Chipmunk for rigid body physics (think collisions ).

11.5 Summary

Dealing with media is a huge topic that probably could fill a book on its own. Fortunately, there are relatively easy (if limited) ways to utilize each major sort of media. In this chapter, we discussed the various ways to manage and manipulate images on the iPhone and iPad. We first discussed how to load them from disk. This includes images saved in an application s directory as well as from the camera roll. We also showed you how the UIImagePickerController can be slightly modified to allow the user to take a photo and use it in an application. You ve seen how all these pictorial fundamentals work together, so we re now ready to move on to the next major types of media: audio and video.

1. Download the Web page. 2. Parse through the downloaded page and retrieve all the links. 3. For each link retrieved, repeat the process.

With the iPhone, the UIImagePickerController is presented modally. The iPad requires that it be displayed using a UIPopoverController. As you start experimenting with iPad development, you ll notice little changes like this that vary from project to project. The compiler generally notifies you of these issues by printing a message to the terminal. You can use compiler directives to determine the device for which you re building. Based on the build device, you handle the UIImagePickerController differently. Open the file collageViewController.m, and update the choosePic method to look like listing D.1.