My QQ friend on Apple's mobile phone said, Why do you always play window reminders under the lock screen?

Because the message reminder has been turned on.

Specific steps of closing (2).

Method 1:

Open the settings and find the notification center.

Open the notification center and drop down to find "include".

There is QQ in "including", click to enter.

Turn off all options.

Note: All the above operations are carried out in Apple's mobile phone settings.

Method 2:

Open QQ on your mobile phone.

Click on the avatar in the upper left corner.

Settings appear in the lower left corner.

Click Settings to find message notifications.

Click enter to turn off the sound.

Note: All the above operations are carried out in mobile QQ.