01 October 2021
The biggest highlight of the iPhone 13 Pro lineup i.e. iPhone 13 Pro and iPhone 13 Pro Max is the support for 120Hz ProMotion Display. This puts the newer iPhone models in line with Android premium phones that come with high refresh rate panels. While users and critics have appreciated the 120Hz implementation, they also found it to be incompatible with third-party apps.
Apple says third-party apps will need to be updated to fully utilize the 120Hz ProMotion Display tech available on the new iPhone 13 Pro models. The developers will have to add a new Info.plist key in their respective apps' code. This will allow the operating system to be aware of the fact that the app not only supports a 120Hz refresh rate but also wants to make use of it. If a dev does not add this reference, his/her app will remain capped at 60Hz.
It should be noted that this condition is not in place for the iPad Pro that also offers a 120Hz refresh rate. Apple seems to have gone this way for iPhone models due to their significantly smaller batteries than an iPad. The complete steps related to how to do that on an iPhone will be shared with developers soon enough.
Additionally. Apple has acknowledged that there is a software bug affecting some of the Core Animation-based animations. This results in those animations not working at the highest refresh rate. The team is said to be working on a fix for the same and it will be released in the near future.
In other words, it may take a few more weeks or even months before you are able to enjoy all of your favorite iOS apps at a 120Hz refresh rate. This is not surprising as whenever a new tech arrives, it takes some time before all developers get on board with it.