更改NSUserNotification显示的时间

Question

我有NSUserNotification

NSUserNotification *n = [NSUserNotification new];
n.title = self.title;
n.subtitle = self.subtitle;
[NSUserNotificationCenter.defaultUserNotificationCenter deliverNotification:n];

但我无法控制它显示时间的横幅？是否可以使用某些私有API来控制它

    [n setValue:@(self.ignoresDoNotDisturb) forKey:@"_ignoresDoNotDisturb"];