It can be pretty annoying to be holding an iPhone and reading an ebook or website when suddenly the screen dims, warning that Apple's smartphone is about to automatically fall asleep. This battery-saving feature is usually very convenient but frustrating when it happens unexpectedly. The good news is that Apple realizes that and offers a few different solutions.
Reading on an iPhone is quite convenient since it's a device that's almost always available. Whether using the built-in Apple Books app, News, browsing a website on Safari, or reading something with a third-party app, Apple has several controls to adjust brightness, contrast, tint, text size, and boldness to make it easier to read. In addition, Safari's 'Reader Mode' is helpful to remove menus and place photos inline for fewer distractions.
With the iPhone brightness and other settings prepped for an ideal reading session, it can be frustrating when the screen dims because the screen hasn't been touched for a while. One solution is to set the 'Auto-Lock' option in 'Display & Brightness' Settings to 'Never,' preventing dimming entirely and leaving it up to the user to manually put the iPhone to sleep by pressing the side button. Dimming and sleeping are very beneficial features, extending battery life considerably, so that option places an extra burden on the user. A better choice for most users when using an iPhone with Face ID is to use Apple's advanced 'Attention Aware' feature.
Enabling iPhone's Attention Aware
The iPhone's 'Attention Aware' feature is found in the Settings app under the 'Face ID & Passcode 'tab. The user can scroll about halfway down the page and toggle on 'Attention Aware Features,' preventing the iPhone from dimming while the user is looking at the iPhone's screen. That's not the only thing 'Attention Aware' does. As a security feature, the iPhone won't expand notifications from the lock screen unless the user is looking at the screen, preventing the unauthorized reading of the complete notification. Another convenient feature of 'Attention Aware' is preventing the volume of alerts from being lowered when the user isn't visible or when they're looking away. That means an important notice won't be silenced accidentally while in a pocket or when being held by someone else.
Apple's Books app has a wide selection of novels, manuals, and short stories. Authors sometimes offer the first book in a fiction series as a free download to get familiar with the world, and sample chapters are common even for popular books. It's pretty easy and entertaining to browse and see what is available. Naturally, users can find Amazon's Kindle app and several other reading apps in the App Store. Whether reading a novel, a document or a website, a user can avoid interruptions caused by screen dimming with the iPhone's 'Attention Aware' and 'Auto-Lock' features.
Source: Apple