How does Apple 6s close the camera distance?

Tools/materials: IPhone6s mobile phone.

1. Click on the camera in the mobile phone desktop.

2. Slide the screen left and right with two fingers.

If you want to zoom in, just slide the pulley on the screen to the left.

If you want to zoom in, just slide the pulley at the bottom of the screen to the right.

5. Finally, click the shoot button on the screen to complete the shooting action.