Nutrition and Exercise During Pregnancy VoiceOver Presentation
Accessibility on iOS - Stanford University · About me •B.S. Duke ’02 •Peace Corps (Tonga)...
Transcript of Accessibility on iOS - Stanford University · About me •B.S. Duke ’02 •Peace Corps (Tonga)...
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Make an app for everyone
Chris FleizachiOS Accessibility
Accessibility on iOS
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About me
• B.S. Duke ’02
• Peace Corps (Tonga)
•M.S. UCSD ’06
• Four years at Apple (including internship)
■ VoiceOver (Mac OS X)■ iOS Accessibility
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• Closed Captioning• Zoom• Screen readers•Many others…
Accessibility
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Settings › General › Accessibility
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“I predict that the visually impaired community will agree that the iPhone was the single biggest game changing piece of technology for the assistive tech industry in modern times.”Josh de Lioncourt, maccessibility.net
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VoiceOver and Accessibilityand Video
Demo
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What You’ll Learn
• iOS Accessibility Overview•UIAccessibility Protocol
■ Accessibility Attributes■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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Accessibility API
•An accessibility interface allows another process to■ Access individual items in the user interface■ Query for status, state and description■ Perform actions and events
• The remote process is an Assistive Technology (i.e. VoiceOver)
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Accessibility Architecture
“Cupertino, 10:57AM”
UI Accessibility ProtocolVoiceOver UI Accessibility
Protocol
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Making Accessible Apps
•Accessibility API introduced in iOS 3.0■ Lives in UIKit in UIAccessibility.h
•Allows an app to provide UI information to VoiceOver• Standard controls in UIKit already accessible
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Accessibility attributes return information about the elementUIAccessibility API: Attributes
- (BOOL)isAccessibilityElement
- (NSString *)accessibilityLabel
- (UIAccessibilityTraits)accessibilityTraits
- (CGRect)accessibilityFrame
- (NSString *)accessibilityHint
- (NSString *)accessibilityValue
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Common Accessibility Attributes
■ Return YES to make VoiceOver see this element
■ A textual representation of the element
- (BOOL)isAccessibilityElement
- (NSString *)accessibilityLabel
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Accessibility Traits
■ Defines behavior■ Bitmask of integers
- (UIAccessibilityTraits)accessibilityTraits
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Accessibility Traits
Image
ButtonAdjustable
Static Text
| Starts Media Session
| Summary Element
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Other Accessibility Attributes
■ The onscreen rectangle for the UI element
■ A dynamically changing value that describes the UI element
■ A string that provides additional help
- (CGRect)accessibilityFrame
- (NSString *)accessibilityValue
- (NSString *)accessibilityHint
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Adding Accessibility with IBChange simple accessibility values
isAccessibilityElement accessibilityLabel
accessibilityHint accessibilityTraits
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Introduction to iPhone AccessibilityDemo
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What You’ll Learn
•UIAccessibility Protocol■ Accessibility Attributes
■ Adding Accessibility in Code■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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Adding Accessibility in CodeIf accessibility values don’t change
- (void)awakeFromNib { ...
UIControl *control = [[UIControl alloc] initWithFrame:frame]; control.isAccessibilityElement = YES; control.accessibilityLabel = @"Play"; [window addSubview:control];
...}
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If accessibility values changeAdding Accessibility in Code
@implementation MyTemperatureView
- (NSString *)accessibilityLabel { return @"Current Temperature";}
- (NSString *)accessibilityValue { return [cityWeather currentTemperatureAsString];}
@end
- (BOOL)isAccessibilityElement { return YES;}
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NotificationsTell VoiceOver something happened
UIAccessibilityPostNotification( UIAccessibilityScreenChangedNotification, nil);
UIAccessibilityPostNotification( UIAccessibilityLayoutChangedNotification, nil);
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NotificationsTell VoiceOver something happened
UIAccessibilityPostNotification( UIAccessibilityAnnouncementNotification, @"89 degrees east");
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Setting Accessibility Attributes Demo
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What You’ll Learn
•UIAccessibility Protocol■ Accessibility Attributes■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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Accessibility Containers
• For custom views with multiple parts• Returns accessibility “sub-elements”
MonthView : UIView
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Accessibility Containers
• For custom views with multiple parts• Returns accessibility “sub-elements”
“October 14th”
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Accessibility Containers
• For custom views with multiple parts• Returns accessibility “sub-elements”
“October 11th”
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Creating a Sub ElementMake a UIAccessibilityElement
UIAccessibilityElement *dayPart = [[UIAccessibilityElement alloc] initWithAccessibilityContainer:monthView];
dayPart.accessibilityLabel = @"October 14th";
dayPart.accessibilityFrame = CGRectMake(200, 200, 50, 50);
[accessibilityElements addObject:dayPart];
Text
UIAccessibilityElement
“October 14th”
{ 200, 200, 50, 50 }
dayPart.accessibilityTraits = UIAccessibilityTraitSelected;
Selected
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Accessibility ContainerMirrors NSArray
@implementation MonthView
- (NSInteger)accessibilityElementCount { return [accessibilityElements count];}- (id)accessibilityElementAtIndex:(NSInteger)index { return [accessibilityElements objectAtIndex:index]}- (NSInteger)indexOfAccessibilityElement:(id)element { return [accessibilityElements indexOfObject:element]}@end
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Accessibility Container ProtocolDemo
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What You’ll Learn
•UIAccessibility Protocol■ Accessibility Attributes■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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@implementation PageControl
Accessibility ActionsAdjustable elements
- (UIAccessibilityTraits)accessibilityTraits { return [super accessibilityTraits] | UIAccessibilityTraitAdjustable;}- (void)accessibilityIncrement { [self moveToNextPage];}
@end
- (void)accessibilityDecrement { [self moveToPreviousPage];}
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@implementation CityView
Accessibility ActionsScrollable elements
-(BOOL)accessibilityScroll:(UIAccessibilityScrollDirection)direction {
return NO;
}
if (direction == UIAccessibilityScrollDirectionLeft) { [self scrollLeft]; UIAccessibilityPostNotification (UIAccessibilityPageScrolled, @"Showing Cupertino"); return YES; } else if (direction == UIAccessibilityScrollDirectionRight) { [self scrollRight]; UIAccessibilityPostNotification (UIAccessibilityPageScrolled, @"Showing San Diego"); return YES; }
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Accessibility ActionsDemo
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What You’ll Learn
•UIAccessibility Protocol■ Accessibility Attributes■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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■ Is VoiceOver on?BOOL UIAccessibilityIsVoiceOverRunning()
VoiceOver-specific API
UIAccessibilityVoiceOverStatusChanged■ A notification to determine when VoiceOver is enabled.
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VoiceOver-specific API
- (void)accessibilityElementDidBecomeFocused■ Did VoiceOver focus on this element?
- (void)accessibilityElementDidLoseFocus■ Did VoiceOver focus leave this element?
- (BOOL)accessibilityElementIsFocused■ Is VoiceOver focused on this element?
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Best Practices
•Use short, concise labels■ Good: “Add city” ■ Bad: “Adds a city to the list of cities”
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Best Practices
•Don’t include the type information in the label■ Good: “Remove city”■ Bad: “Remove city button”
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Best Practices
•Use localized strings for labels and hints■ VoiceOver works in over 30 languages
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Best Practices
•With custom table view cells■ Only need to add accessibilityLabel■ If there are multiple strings, concatenate with commas
- (NSString *)accessibilityLabel { return [NSString stringWithFormat:@"%@, %@", [self header], [self summary]];}
@implementation NewsTableViewCell
@end
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Accessible BowlingDemo
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What You’ll Learn
•UIAccessibility Protocol■ Accessibility Attributes■ Accessibility Containers■ Accessibility Actions■ VoiceOver-specific API
• Best Practices•Apps for users with disabilities
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Apps for users with disabilities
•Accessibility features on iOS has created a large user base•Opportunity to develop apps addressing specific needs
Digit-Eyes oMobySayText
iCanSee Proloquo2GoiPrompts
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Summary
•Add accessibility■ Increases user base■ Heaps of praise■ Karmic improvement
•Apps for users with disabilities■ Incredible innovation awaits
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More Information
DocumentationAccessibility Programming Guideline for iOSSearch on http://developer.apple.com/ for Accessibility
UIAccessibility Protocol ReferenceSearch on http://developer.apple.com/ for UIAccessibility
VoiceOver User Manualhttp://support.apple.com/manuals/iphone
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