1. Enter Settings-General-Storage Space and ICloud Usage;
2. Click Manage Storage Space;
3. Click a program, and then click Edit in the upper right corner;
4. Click the red bar in the figure below-click Delete to clear the cached data of the modified software. (Note: Only the software that comes with the system can clear the buffer. For other software, such as QQ WeChat, you need to open the software. Is it in the settings? Clear cache