14: Usability and Accessibility in Objective-C

Encode Data Matrix in Objective-C 14: Usability and Accessibility

CHAPTER 14: Usability and Accessibility
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accessibility. Once the project is open, turn on VoiceOver (use and Run the application.
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+F5) and then Build
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You will see a window like that in Figure 14 8. Notice the heavy border highlighting the search field, and also the HUD at the bottom of the screen.
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Figure 14 8. VoiceOver overview
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The VoiceOver voice (you can choose from any of the built-in Mac OS X voices using the VoiceOver utility) will identify the control, and after a short pause will let you know how you can interact with that control. Try moving around the window using Ctrl+ +arrow keys, and VoiceOver will oblige you with a message as it highlights each one. Try adding and modifying records and opening the secondary windows. If you're feeling brave, try this with your eyes closed: it will give you a flavor of the user experience for someone with a visual impairment. It's great that you can do this, and control the application so easily with the keyboard, but the interface as it stands has some problems. Take the three buttons that are entitled Manage.... It might be obvious to a sighted person that each button is associated with the popup adjacent to it, but for someone with a visual impairment these buttons are indistinguishable. VoiceOver doesn t have the necessary information to let the user
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CHAPTER 14: Usability and Accessibility
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know which is which. Similarly, if you move to the rich text field that this window uses for the journal content, VoiceOver can't tell you anything about it other than that it is a text area and you can type in it. Refer back to the results we had from the Accessibility Verifier; those showed the same problems. Fortunately, there is something we can do about this. Quit the application and load up the NIB. You might like to turn off VoiceOver temporarily, or you will find it will give you a running commentary on your work in Interface Builder! Open up the Journal Entries window and select the Manage... button next to the client popup. Now find the Identity tab in the Inspector, and in particular the Accessibility Identity section. In the Description field type Manage clients and in the Help field type Click here to bring up the Manage Clients window. Add the appropriate information for the entryContent Text View (ensure that you select this view rather than its parent Scroll View) and then all of the other user interface controls that were mentioned in the Accessibility Verifier report: the search field, the Journal Entry table (see the following note about tagging tables), the three pop-up buttons, the other two Manage... command buttons, the Add and Remove buttons, the Charge Text field, and the Total Charge label. NOTE: In the case of the Journal Entry table you have a couple of options about what you tag. You can choose the Table View, in which case the title and description will be read out when you navigate to the table. You can choose an individual table cell, in which case VoiceOver will read out the text only when you navigate into the table and are on a particular cell. Note also that adding a title and description to the table column doesn t have any result in practice the user will never select a column. Save the NIB, press F5 to turn VoiceOver on, and in Xcode Build and Run. This time, when you navigate to this button VoiceOver will say "Manage Clients button" and after a short pause will follow this with "You are currently on a button. To click this button, press Control-Option-Space. The help tag is: Click here to bring up the Manage Clients window." Both of these spoken messages are backed by a HUD-type message window at the bottom left of the screen (see Figure 14 9). If you navigate on to the Text View then you will get the relevant messages there too.
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