How does Apple find the message copied before the clipboard is opened?

Apple's mobile phone can find the message copied before the clipboard is opened by pressing a space in the chat box of any chat software.

1. Unlock the home screen of iphone to the home page and open any chat software, such as QQ. As shown in the figure.

2. After entering QQ, select a friend to open the dialogue window. As shown in the figure.

3. Find the message you want to copy. As shown in the figure.

4. Press and hold "Information to Copy", the clipboard selection function will pop up, and the message to be copied can be saved in the clipboard. As shown in the figure.

5. Long press the blank chat box to pop up the clipboard and select Paste. As shown in the figure.

6. Successfully open the clipboard and find the previously copied mail. As shown in the figure.