How to set the depth of field effect of Apple's mobile phone?

First find the subject A (it is recommended to choose an object close to us) to focus. After the focus is successful, a focus box, namely focus lock, will appear after long press on the screen. Click on the photo. After the composition is completed, choose the photo subject A that you want to highlight and the part that needs to be blurred (except A), and make sure that they are not on the same plane. Manually click a multiple times to focus on the line of sight. After adjusting to a satisfactory effect, keep the phone stable, press the shutter and click on the photo, which has the effect of blurring the background. Post-processing can also get photos with good depth of field. The way to realize the depth-of-field effect of photos through software editing is to use the background blur (depth-of-field effect) function in Meitu Xiu Xiu. The depth of field effect is realized by using the digital darkroom-diagonal magic wand function in the light and shadow magic hand software.