我在表格视图中实现了所有可访问性操作方法并添加了“可调整”特征。我使用 UITableView 进行了自定义控件,以通过滚动选择一个项目。它没有可供选择的典型行。它用于滚动,标记显示选择的内容。类似于 UIPickerView 或 Weightbot 中的选择器。它是一个自定义日期选择器控件,用于选择事件日期。
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弹 Voice Over 没有正确反应。它疯狂地跳来跳去。
我必须为配音设置委托或数据源吗?当用户像在 UIPickerView 中一样向上/向下轻拂时,如何让它正确地向上/向下滑动我的表格视图?
了解 Apple 是如何通过 VoiceOver 访问 UIDatePicker 将大有帮助。它对每一列使用 UITableView。您可以在列之间拖动以选择列。然后您可以向上轻弹以增加或减少。
编辑:递归地转储有关 UIDatePicker 的信息以查看它是如何设置的。
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}
它在设置/实施时打印所有可用的可访问性相关的东西。如您所见,奇怪的是表格视图单元格的 UILabel 实现了滚动方法。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性。
这是我用来转储此信息的代码。为了确定,我在延迟 2 秒后最初在 UIDatePicker 上调用它。我将此代码放在 UIView 的类别中。
- (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;
}