选中后,NSWebView会覆盖VoiceOver

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0

我有一个 NSWebView ,当我在 Mac OS X 上使用VoiceOver时,它宣布 NSWebView 选项为“ HTML 内容”这很可能会让最终用户感到困惑,因为我将它用于自定义控件,而且我已经处理了所有其他可访问性方面的问题 . NSWebView 正确 .

如何覆盖VoiceOver为 NSWebView 宣布的内容?我尝试了以下但是它没有任何区别:

[webView accessibilitySetOverrideValue:@"Map View" forAttribute:NSAccessibilityDescriptionAttribute];

我还尝试了 NSAccessibilityRoleDescriptionAttributeNSAccessibilityTitleAttribute 作为属性 .

1回答

  • 0

    您可能需要在 - (id)accessibilityAttributeValue:(NSString *)attribute 方法中继承 NSWebView 并覆盖 NSAccessibilityRoleDescriptionAttribute

    - (id)accessibilityAttributeValue:(NSString *)attribute
    {
        id value = nil;
    
        if ( [attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute] )
        {
            value = @"Map View";
        }
        // all your other ifs here
        else
        {
            value = [super accessibilityAttributeValue:attribute];
        }
    
        return value;
    }
    

    请确保您告诉 NSAccessibility 您提供的内容(特别是 NSAccessibilityRoleDescriptionAttribute 部分):

    - (NSArray *)accessibilityAttributeNames
    {
        static NSMutableArray *attributes = nil;
    
        if ( attributes == nil )
        {
            attributes = [[super accessibilityAttributeNames] mutableCopy];
    
            NSArray *additionalAttributes = @[NSAccessibilityDescriptionAttribute, NSAccessibilityRoleAttribute, NSAccessibilityChildrenAttribute, NSAccessibilityTitleUIElementAttribute, NSAccessibilityRoleDescriptionAttribute];
    
            for ( NSString *attribute in additionalAttributes )
            {
                if ( ![attributes containsObject:attribute] )
                {
                    [attributes addObject:attribute];
                }
            }
        }
    
        return attributes;
    }
    

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