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Another possibility that we haven t seen yet would be to force a browser resize to a 320x480 screen. Ultimately your choice will depend on what you expect your user base to be but giving readers more information by providing some sort of desktop page is rarely going to be a bad thing.
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Although an iPhone theoretically contains a fully enabled desktop browser, there s no way that a small handheld device could ever provide the complete functionality of a desktop display. Fortunately, there are some easy things you can do to improve the experience for iPhone viewers of your web page. We ve broken our redevelopment suggestions into two parts. First, there are fixes that you need to apply to make your web pages iPhone friendly. Second, there s functionality you can use to directly detect iPhone usage and thus make your pages iPhone optimized. If you follow all the advice in this chapter adding some simple iPhone variables to your pages, improving your web abstractions, engaging in some iPhone best practices, playing with the chrome, and looking at iPhone gestures you ll have dramatically improved how your web pages work on an iPhone. The ultimate in iPhone optimization is creating totally new displays for your web page that format content in a method that s more accessible on the iPhone s smaller screen. If you go too far in this direction you ll end up branching your code base, providing entirely different support for iPhones and desktops. Although that may be further than you want to go if you re just supporting the occasional iPhone user, if you re providing serious iPhone support and as a reader of this book, you probably are it may end up being a necessity. This leads nicely into our next topic iPhone web apps, which are web pages built solely for use on the iPhone.
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This chapter covers
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Learning about the WebKit Recognizing touch gestures Recognizing orientation
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In the previous chapter we covered the fundamentals of redeveloping an existing web page for use on iPhones. In the process you learned about important concepts like the viewport, and we discussed a lot of what works and what doesn t on Apple s unique mobile platform. We expect, though, that most of you aren t just interested in touching up existing web pages but instead are looking to create totally new programs. Further, after considering the advantages and disadvantages of both web and native development, you ve decided that writing a new program using a web language is the best way to go. We re now ready to enter the world of web apps, a topic that will consume the rest of part 2 of this book. We ve identified three ways to create web apps for the iPhone. Each will take advantage of all your existing web knowledge, but each will also connect you with a specific library or Apple browser add-on that will allow you to unlock additional functionality on the iPhone platform.
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First, you might choose to build a textual web app, which is an application that is largely built on the fundamentals of HTML itself. You ll be able to supplement it with the advanced features of Apple s WebKit. We ll be discussing this programming method in this chapter. Second, you might choose to build an iPhone-UI web app, which is an application with a user interface that looks like iPhone s native apps. That will be the topic of chapter 5, where we ll also cover iUI, a programming library meant to make this task easier. Third, you might choose to build a graphical web app, which is an application that pushes the boundaries of web graphics. That will be the topic of chapter 6, where our discussion will center on Canvas, a graphical add-on introduced by Apple several years ago that is now widely available. Let s get started with the first of those topics: textual web apps and the advanced functionality of Apple s WebKit. In this chapter we ll explore a wide variety of WebKit options, starting with simple HTML and CSS, and then build on that with advanced functionality such as transformations and databases. We ll conclude with some code that s iPhone only.
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