Basic IOS system features

Source: Internet
Author: User

1. iPhone system features

* Users can only interact with one application at a time. Only oneProgramStartup is running, and other programs can only run in the background. The background Running Mechanism greatly shortens the time required to restart the program.

* Programs running in the background occupy the system memory space. When the system memory is insufficient, the system forces idle applications to be disabled to recycle system resources.

2. Virtual Memory Mechanism

* Both iOS and Mac OS have a memory mechanism, and each process has its own virtual address space. iOS cannot use page files to expand the address space of the process. When the system memory is insufficient, a message is sent to the application, and the idle memory of the address space is released after the application receives the message.

3. Automatic sleep counter: automatically turn off the screen to save resources. (mobile phone embedded devices are widely used .)

4. Security: Sandbox mechanism: protects user data and isolates different programs. After the program is installed, the system calculates a unique ID, which indicates the installation path of the program. This program can only access files and applications in its sandbox.

5. iPhone icons are 57*57 pixels in size, HD icons: 114*114 pixels, screen resolution: 320*480 pixels

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