Apple tries to simulate the experience of a snapshot camera when you take a picture in the Photos app on an iPhone or iPad by issuing a little click sound. Many of us prefer to avoid that sound.
Remarkably, there’s no click on/off switch in the Camera settings! Instead, you have one of three alternatives:
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Enable Live Photo: If you’re hearing a click, you don’t have this feature turned on, which retains some still images from before and after the point at which you take a pictures, providing some animation—and audio. If the click were on, it would be captured in a Live Photo. You can have Live Photo always on when you launch the Camera by enabling Settings > Camera > Preserve Settings > Live Photo.
