iPhone 15 Pro and iPhone 15 Pro Max come with a new Action Button, which replaces the mute/ring switch and lets users mute the phone, open apps, turn on the flashlight, and even run Shortcuts when pressed. Officially, there’s no API for third-party apps to use the Action Button for in-app interactions, but the popular camera app Halide has found a way to control the app using the Action Button.
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