辅助功能 - UIPickerView 作为 inputView

Accessibility - UIPickerView as inputView

我正在使用 UIPickerView 作为 UITextField 的 inputView。

self.pickerView = [[UIPickerView alloc]initWithFrame:CGRectZero];

self.pickerView.dataSource = self.datasource;
self.pickerView.delegate = self.delegate;

//additional setups

self.textField.inputView = self.pickerView;

一切正常,但是当我激活画外音并开始循环播放 itens 时,画外音开始发出错误的通知。

我做了一些研究,我在 github 上找到了一个有同样问题的人的回购协议,但我找不到任何解决方案。

我找到了这个案例的解决方法。在 pickerView(_:didSelectRow:inComponent:) 方法中,我使用 UIAccessibilityPostNotificationUIAccessibilityAnnouncementNotification,传递选择的项目,强制画外音发出正确的通知。

Objective-C:

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    if(UIAccessibilityIsVoiceOverRunning()){
        UIAccessibilityPostNotification(UIAccessibilityAnnouncementNotification, self.items[row]);
    }
}

Swift:

func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
    if(UIAccessibility.isVoiceOverRunning){
        UIAccessibility.post(notification: UIAccessibility.Notification.announcement, argument: self.items);
    }
}