Năng động, dữ liệu: Apps với giao diện người dùng năng động các yếu tố, chẳng hạn như thông tin dựa trên vị trí, cần phải cập nhật những mô tả khả năng tiếp cận trực tiếp. Xem iPhone Dev Trung tâm "Nghị định thư UIAccessibility tham khảo" 3 để biết chi tiết thực hiện. | would be better to say what the icons mean for example three dollar signs could be read as 15 to 25 per entrée. When users tap on the Epicurious tab bar icons they get image names for example . This sort of extraneous information is not helpful at all. This problem is exacerbated by the use of nonstandard tab bar icons that require two taps one for the icon and another for the label see FIGURE . If you must customize your icons make sure you provide useful labels. FIGURE Urbanspoon provides a dollar sign label for price images. FIGURE Epicurious provides cryptic labels for tab bar images. Dynamic data Apps with dynamic UI elements such as location-based information need to update accessibility descriptions on the fly. See the iPhone Dev Center UIAccessibility Protocol Reference 3 for implementation details. Table views If your app has table views that contain more than one piece of information per row you may want to aggregate the information into one label. FIGURE illustrates how the NYTimes app aggregates headlines and descriptions. If the information were not aggregated users would have to tap twice to read each article summary. 3. iPhone Dev Center UIAccessibility Protocol Reference http iphone library documentation UIKit Reference UIAccessibility_Protocol Introduction 268 CHAPTER 12 ACCESSIBILITY AND LOCALIZATION Download from FIGURE The NYTimes app aggregates headlines and descriptions. CUSTOM ACCESSIBILITY SOLUTIONS Although the iOS has a number of built-in accessibility solutions it may be beneficial in some apps to create customized solutions. One of the most common ones is the ability to adjust type size within news blog or Twitter apps FIGURE . If you choose to create custom solutions make sure they do not conflict with VoiceOver and other features in the Accessibility section of Settings. FIGURE GQ users can choose from four different type sizes. .
