If you need to quickly take a photo or video on your iPhone, you can swipe into the Camera app quickly without unlocking your phone. Let’s explore how this is done.
This is for the iPhone

First, wake up your iPhone. Place your finger anywhere on the lock screen and swipe it to the left until the Camera app appears. If you try to swipe on a notification that will reveal options for the notification rather than opening the Camera app. Refer to below image:

Next, with the Camera app open, you can take photos or videos as you normally would, and they will be saved automatically to your Photos library. You can even use the volume buttons to trigger the shutter if you like. See below image that will be saved to Photos library:

Now, to exit Camera mode, press the top button (for iPhones with home buttons) or the side button (for iPhones without home buttons) to turn off your screen. The photos you took will still be saved.
iPhones Without Home Button
If you have an iPhone without a home button (one that uses Face ID) you might notice a tiny camera icon in the lower-right corner of your lock screen. See following image:

You can use this button to launch the Camera app with a long-press. Just place your finger on the camera icon for a moment. When you lift your finger, the Camera app will launch.
When you are done, press the side button, and the photos and videos you have taken will be saved automatically.
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