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Redisplaying web pages
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Figure 3.2 Gmail offers a different experience for iPhone users through a page that has been redisplayed to the point where it s become an iPhone web app.
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when we cover iUI. Part of this chrome centers on the use of menus that appear only when you click a button, much as is the case with the << Menu button here. However, the Gmail page also shows some of the limitations of redisplaying your pages on the iPhone. For one, it often hides content at deeper levels; you can no longer look at a list of your Gmail tags without going to a separate web page. In addition, Google has cut back on the amount of information on the screen. This helps you to read things, and also means that you have to download less at a time through a potentially slow EDGE connection, but it also makes it difficult to figure out what s inside a message when you view it from the iPhone. This is because much of the subject gets cut off a particularly annoying problem for mailing list messages where a mailing list title takes up part of the subject line.
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The Facebook iPhone pages
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Facebook is another website that has been rewritten to redisplay on the iPhone. Their main content pages are much more readable on the iPhone thanks to, once again, a river format. Rather than using the iPhone standard of pushing a menu off to another page, the iPhone Facebook pages create an elegant tabbed interface that works pretty nicely, though it eventually scrolls off the screen, thanks to the lack of absolute positioning on the iPhone. Rather than repeating our Gmail discussion by looking at those core content pages, we ve decided to examine the Facebook login screen, shown in figure 3.3.
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Redeveloping web pages for the iPhone
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Figure 3.3 Facebook s iPhone Optimized login screen makes everything big and easy to use, and gets rid of superfluous content.
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If Facebook s normal login page were shown on the iPhone, it d be impossible to read and impossible to click on the login forms until you did a columnar zoom on the left-hand column. The iPhone page instead just shows you login widgets that are full sized on your screen. Although it s not shown, they re also perfectly sized to fill an iPhone screen if it s in landscape mode. The downside is that you lose all the extra information from the normal login page. To offset that deficit, the iPhone page gives users the option to hop over to the regular Facebook page, something that more sites should offer. On the whole, this special Facebook login is much more functional on the iPhone. Further, this type of redevelopment is easy to do, since it just requires recoding a simple form for iPhone usage. If you re clever, you could even do it without recoding the page: a simple viewport command with an initial-scale set to zoom in to the left column would have accomplished much the same job as Facebook s wholescale redevelopment.
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As we ve noted, at some point your iPhone-optimized page will be so iPhone specific that it moves out of the arena of optimization and actually becomes a web app. When this happens, make sure you have a fallback page for non-iPhone users. Just as it s great to have mobile versions of your desktop pages, you should also have desktop versions of your mobile pages.
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Supporting non-iPhone users
Lessons for SDK developers
Many of the lessons in this chapter had to do specifically with web design, including good HTML practices and specific attributes and tags that can be used on the Safari web browser. This chapter also gave us our first look at the two biggest innovations we discussed in chapter 1: input and output. When looking at input, we saw the problems of fat fingers and how events have to be modeled differently because the finger isn t a mouse. These same differences and limitations will appear in your own SDK designs. When looking at output, we saw the clever way in which the iPhone uses its relatively small screen to model a much larger viewing space. Using a similar model for an SDK program can help you to use the iPhone s architecture to its fullest (and in fact is already used in the SDK s UIWebView class). We also saw our first hints at core iPhone functionality: the chrome and events. The chrome will be a minor issue when you re doing SDK development. You ll still have a top bar, but you ll have better control over what it looks like. You ll be able to choose whether to have status-like bars or bottom bars depending on the needs of your program. Once you ve made a choice, you can just pick the right class of objects from the SDK and drop it into your program. The events listing in this chapter offer an excellent preview of how iPhone events are different from standard mouse-driven events. iPhone events aren t just about pointand-click; they re about one or more fingers temporarily touching the screen, then moving in different ways. You ll learn about how touches can be accessed even on the web starting in the next chapter. In the meantime you should be considering how this new paradigm for input might change how users interact with your programs.
If you have two parallel websites running side by side, you can either automatically forward users from one set of pages to the other depending on their device, or give them the choice to move to the parallel website no matter which device a user is working from. We suggest the latter, as we saw in the Facebook example site. We recommend this approach because we remain committed to letting users choose their web experience whenever possible, but also because we ve already seen iPhone web apps that we felt provided an inferior experience to viewing the desktop web pages. This could well be a personal preference, and that s a great reason to offer a choice. Even if your iPhone pages make the best possible use of an iPhone s unique capabilities, some users may prefer the creakier but probably more fully featured possibilities offered by a true desktop web page. When you step up to offering a full web app without any parallel desktop pages it s polite to at least let desktop users know what s going on. Some websites give a warning as to why an iPhone web app looks so funky on a desktop screen, while others just don t allow users to visit the web app pages from a desktop browser.
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