Go to the main page of iPhone, find the settings, and click Enter.
2. In the setting details page, slide the screen to find the general options, and then click again to enter the detailed configuration.
3. On the setting page of General Settings, you can see that there is an access restriction option (not turned on by default) called "Application Lock". Click to enter the configuration.
4. On the Settings page, click Enable Access Restriction. All applications that support setting application locks will be listed below, and the applications that need to open application locks will be checked.
5. When you open the access restriction, you will be prompted to enter the access password, and you can set the appropriate password according to your own preferences.
Functions of application lock:
(1) Lock and unlock an application by clicking it in the application list.
(2) Long press the application in the list to lock, unlock and open the application.
(3) You can set a password prompt to prevent you from forgetting your password.
(4) The password can be modified.
(5) By pressing the home key for many times to enter the same application, the problem that similar software cannot encrypt programs normally can be solved.
References:
Application Lock _ Baidu Encyclopedia