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You have just seen the range of controls in Interface Builder, so there is probably not much point in describing these in detail. Let s just have a look at the controls we used in the Daily Journal application. Figure 14 3 shows the main Journal Entries window:
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CHAPTER 14: Usability and Accessibility
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Figure 14 3. Affordance in Mac OS X controls in the DailyJournal application
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Notice that all of the controls you are likely to interact with have a slightly beveled, 3-D appearance. They have a consistent feel about them: they seem to invite the user to interact with them. Even the table column headings (which you can click to order the data by that value) have the same effect. Now let s look at two of these controls that seem at first glance to be quite similar: the date picker stepper control and the pop-up button. Both have similar up and down arrows: what makes them different Well, the stepper control has the up and down arrows encapsulated in a buttonlike construct that disconnects it slightly from the date display, whereas the pop-up button is clearly part of the overall control that includes the pop-up menu text. This provides subtle visual cues that tell you that the pop-up control is part of the menu, whereas the stepper control is somehow separate from the date display as a whole (though it is used to manage each component of the date). The user interface controls available in the iPhone tools have been particularly welldesigned in terms of affordance. Take a look at the controls in Figure 14 4. Do they leave you with any doubt about their different purposes
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CHAPTER 14: Usability and Accessibility
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Figure 14 4. Affordance in the iPhone user interface
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Furthermore, users of the iPhone pick up both the touch-screen display and the gesture control metaphor extremely quickly (it is, after all, the only way to use it!), and so controls like this suggest to the user the way in which the controls should be manipulated (this is known in usability circles as a direct-manipulation interface because you interact directly with the control in a realistic fashion).
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Tab Order
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The tab order, as the name suggests, is the order in which your controls take the focus when you load a window and use the Tab key to navigate around it. Setting your tab order is a matter of setting the firstResponder (the control that first receives focus when the window is loaded) and the nextKeyView for each of the controls to which you want to be able to tab. Think about the likely workflow for a user of your application where would you expect them to start, and where would they go from there Setting the tab order is as important for accessibility purposes as it is for usability: when your user has a visual impairment, it is important to provide a logical progression around your user interface to help them in framing the mental model for the program.
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CHAPTER 14: Usability and Accessibility
Special Usability Considerations for iPhone Program Design
Software for the iPhone presents some usability challenges and opportunities that you don t have with software design on the Mac. Let s run through some of the main points.
Form Factor
The most obvious difference between a program running on the Mac and one running on the iPhone is that you have much less real estate to work with on the latter. A consequence of this is that you need to be much smarter and more disciplined about layout and use of screen space. Another is that you can t present as much information as you might in a Mac OS X program. This is actually a nice discipline, since it forces you as a designer to be clear about the purpose of each part of your system and prevents you from building overly complex interfaces.
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