When it comes to notification on iPhone, it is the sudden appearance of small dialog boxes and concise sound / vibration, but depending on the setting can produce unexpected results. Just like your question, you can set it to a strange setting, that is, nothing will be displayed on the screen as long as you vibrate, and you won't know the notification until you take a special action.
You can specify the display style of notifications for each application on the Settings notifications screen. The display location of the dialog box can be selected from the Lock screen, Notification Center, and Banner types, and all types are displayed in the initial settings.
Among them, when the iPhone is not locked, the "banner" appears at the top of the screen and disappears automatically after about 7 seconds. Then, if you only hide the banner (cancel the check in the settings screen of the notification), although the Lock screen and Notification Center display the notification unchanged, only the notification sound and vibration can be transmitted when unlocked and working on the main screen.
This "sound / vibration but nothing display notification" helps prevent banners from accidentally tapping. If you click on the displayed banner, the notification disappears from the lock screen / notification center, but if you disable the display of the banner, it will not accidentally tap. When there is a spare time to display the notification center, pay attention to the corresponding notification content.
Notifications received during sleep will be displayed unchanged on the lock screen, so there is no problem. If there is an application that accidentally clicks on the banner and doesn't understand the content, do you want to try it?
