Apple has confirmed that developers can use 120Hz on the iPhone 13 Pro and Pro Max, but that they must include their apps to use this feature.
On Friday, some developers noticed that not all apps used the iPhone 13 Pro’s 120Hz refresh rate. This feature would work for scrolling or full-screen transitions, but that all other animations in third-party applications are limited to 60Hz.
There’s been a pretty tricky workaround, but Apple has now confirmed that apps can actually take advantage of this feature by adding a new plist entry to their app, declaring it uses higher frame rates.
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Apple has released new documentation explaining to developers how often ProMotion refreshes for the iPhone 13 Pro, which states:
On iPhone 13 Pro or iPhone 13 Pro Max, add the following key to the Info.plist file to enable the full range of refresh rates for CADisplayLink callbacks and CAAnimation animations in your application:
Your application must use this key to access higher frame rates (above 60Hz) that it sets in the desired FrameFateRange hint API. The iPad Pro does not require this special configuration.
The new 120Hz screen in the iPhone 13 Pro is one of the biggest new features in Apple’s best iPhone this year, offering smooth scrolling, viewing and use. It also has a variable refresh rate to conserve battery life and a new Super Retina XDR screen that is much brighter than the old one.
Apple has also reportedly confirmed that there is a bug that affects some animations using Core Animation and that a fix in iOS 15 is on the way.
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