I have define a custom actions in my accessibilityElement:
UIAccessibilityCustomAction *action1 = ...initWithName:@"label1";
UIAccessibilityCustomAction *action2 = ...initWithName:@"label2";
element.accessibilityCustomActions = @[action1, action2];
When swipe down/up, it reads "Drag" in addition to the normal "label1", "label2", what is this "Drag" and how did it come about?