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Draw Code 39 Extended in Objective-C 3: What s Next

CHAPTER 3: What s Next
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Master-Detail
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One of the central features of the iPad, not found on the iPhone, is the master detail interface. It s been around for a while on Mac operating systems, and now it has blossomed in a new form. Master-detail is an interface layer that sits on top of a list or a table and acts as an intermediate stage in place of a Go back or Go to button. On the iPhone, either the master or the detail can be seen, one at a time, but never both at the same time. This dual-purpose layer can serve the user in the e-mail realm, for instance, with the master as inbox and the detail as individual letter, or in countless other contexts as a table of contents and selected data. As you can see in this image from Apple (Figure 3 9), the iPad presents the master-detail in either orientation.
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Figure 3 9. Note how the master-detail sits on top of an individual e-mail in the portrait orientation, but side-byside in the landscape orientation.
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User Interface on iPad
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Some applications will scale up from the iPhone without problems. However, these applications are likely to be in the minority, as the input capabilities and display space of the iPad completely change an application s fundamental character. To accommodate this, we need to bring some specialized user interface design needs into the picture in order to present your application on both platforms. NOTE: Be aware that although the iPad can enlarge images on an iPhone, my testing of iPad apps (as of April 3, 2010) showed that large images would not convert seamlessly to an iPhone application.
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CHAPTER 3: What s Next
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The new interface elements introduced with the iPad allow for highly stylized and powerful data flow and interaction within an application. The smart folks at Apple have done most of the work for you, providing incredibly rich and easy-to-use interface elements that let you focus on the functionality of your application.
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Checking the Platform
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That s all fine and good, but obviously there are some things that the iPad can do that the iPhone cannot and vice versa. We already know there are additional classes the iPad uses that the iPhone will not recognize. So what must we do to make our application behave correctly depending on which device it is currently running This is, unfortunately, not as straightforward as one would hope, but it can be done. For this reason, we are not going to worry about checking the current platform. Instead, we will just change the nib files to do what we need them to do on the iPad. Don t worry nibs and Interface Builder work exactly the same way for the iPad as for iPhone. However, if you absolutely must know, there are a variety of techniques used to check the current platform of an application. These all involve checking for the existence of platform specific classes, functions, or features. For example, you could check the width of the screen to determine the platform. An iPhone app will return a screen width of 320 pixels, while an app written for the iPad will return a screen width of 768 pixels. Clearly, if the returned screen width is less than 768, we know we are working on an iPhone or, perhaps, an iPod Touch. Of course, there are other ways of checking the current platform. You can also check a function called UI_INTERFACE_IDIOM().This function can return either UIInterfaceIdiomPhone or UIInterfaceIdiomPad. These examples are pretty self-explanatory, I hope, and can be used to accurately determine the device. Of the many different techniques to determine the current platform, you will learn to use the one that is the most convenient in the given context. NOTE: As stated previously, each device can do certain things the other can t. The iPad can t make phone calls, take photographs, or record video. Case by case thought should be applied to apps regarding location-aware services and accelerometer functions for although both devices are portable and shakable, size may matter!
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