Question

我在表格视图中实现了所有辅助功能操作方法，并添加了“可调整”特征。我使用UITableView进行自定义控制，通过滚动选择项目。它没有要选择的典型行。它用于滚动，标记显示所选内容。类似于UIPickerView或Weightbot中的选择器。选择活动日期是自定义date picker control。

但iOS从不调用我的辅助功能操作方法。在表格视图中向上或向下轻拂Voice Over无法正常反应。它疯狂地跳来跳去。

我必须为语音设置代理或数据源吗？当用户像UIPickerView一样向上/向下滑动时，如何才能正确地向上/向下移动表格视图？

理解Apple如何使用VoiceOver可以访问UIDatePicker将会有很大帮助。它为每列使用UITableView。您可以在列之间拖动以选择列。然后你可以向上滑动增加或减少。

编辑：以递归方式转发有关UIDatePicker的信息，以了解其设置方式。

 UIDatePicker: 
     _UIDatePickerView: 
         UIView: 
         _UIOnePartImageView: 
         _UIPickerWheelView: 
         _UIPickerViewSelectionBar: 
         UIPickerTableView:; contentOffset: {0, 2.19991e+06}>
             UIPickerTableViewWrapperCell: 
                 UITableViewCellContentView: 
                 UIDatePickerWeekMonthDayView: 
                     UILabel: {label = 28. Jul} {traits = staticText } {accessibilityIncrement} {accessibilityDecrement} {accessibilityScroll:} {accessibilityPerformEscape} {accessibilityPerformMagicTap}

在设置/实现时打印所有可用的可访问性相关内容。就像你可以看到的，奇怪的是，表视图单元格的UILabel实现了scroll方法。这对我来说没有意义。为什么是这样？为什么不是UIPickerTableView本身？并且在整个UIDatePicker中也没有可调整的特征。

这是我用来转储此信息的代码。为了确定，我在2秒延迟后最初在UIDatePicker上调用它。我把这段代码放在UIView上。

- (NSString *)description {
    NSString *className = NSStringFromClass([self class]);

    NSMutableString *str = [NSMutableString stringWithFormat:@"%@: ", className];

    if (self.isAccessibilityElement) {
        if (self.accessibilityLabel) {
            [str appendFormat:@"{label = %@} ", self.accessibilityLabel];
        }

        UIAccessibilityTraits traits = self.accessibilityTraits;
        [str appendString:@"{traits = "];
        if (traits & UIAccessibilityTraitAdjustable) {
            [str appendString:@"adjustable "];
        }
        if (traits & UIAccessibilityTraitAllowsDirectInteraction) {
            [str appendString:@"interaction "];
        }
        if (traits & UIAccessibilityTraitButton) {
            [str appendString:@"button "];
        }
        if (traits & UIAccessibilityTraitCausesPageTurn) {
            [str appendString:@"pageTurn "];
        }
        if (traits & UIAccessibilityTraitHeader) {
            [str appendString:@"header "];
        }
        if (traits & UIAccessibilityTraitImage) {
            [str appendString:@"image "];
        }
        if (traits & UIAccessibilityTraitKeyboardKey) {
            [str appendString:@"kbKey "];
        }
        if (traits & UIAccessibilityTraitLink) {
            [str appendString:@"link "];
        }
        if (traits & UIAccessibilityTraitNone) {
            [str appendString:@"none "];
        }
        if (traits & UIAccessibilityTraitNotEnabled) {
            [str appendString:@"notEnabled "];
        }
        if (traits & UIAccessibilityTraitPlaysSound) {
            [str appendString:@"sound "];
        }
        if (traits & UIAccessibilityTraitSearchField) {
            [str appendString:@"search "];
        }
        if (traits & UIAccessibilityTraitSelected) {
            [str appendString:@"selected "];
        }
        if (traits & UIAccessibilityTraitStaticText) {
            [str appendString:@"staticText "];
        }
        if (traits & UIAccessibilityTraitSummaryElement) {
            [str appendString:@"summaryElement "];
        }
        if (traits & UIAccessibilityTraitUpdatesFrequently) {
            [str appendString:@"updatesFreq "];
        }
        [str appendString:@"} "];


        if ([self respondsToSelector:@selector(accessibilityIncrement)]) {
            [str appendString:@"{accessibilityIncrement} "];
        }
        if ([self respondsToSelector:@selector(accessibilityDecrement)]) {
            [str appendString:@"{accessibilityDecrement} "];
        }
        if ([self respondsToSelector:@selector(accessibilityScroll:)]) {
            [str appendString:@"{accessibilityScroll:} "];
        }
        if ([self respondsToSelector:@selector(accessibilityPerformEscape)]) {
            [str appendString:@"{accessibilityPerformEscape} "];
        }
        if ([self respondsToSelector:@selector(accessibilityPerformMagicTap)]) {
            [str appendString:@"{accessibilityPerformMagicTap} "];
        }
    }


    return str;
}

在哪种情况下iOS调用-accessibilityScroll：？

0 个答案: