After taking the live photo, open the "Photos" application, click on the live photo just taken, and press and hold the photo hard to watch the live photo.
In iOS 1 1 and higher system versions, LivePhoto also provides the function of changing the displayed photos. Click LivePhoto to change the displayed photo, select Edit, move the slider to change the border, select the photo you are satisfied with, then select "Set as main photo" and click Finish.