One of the greatest challenges developers face when developing for Apple’s platforms today is adapting the layout of their apps to all available screen shapes and sizes. Most apps need to work from the iPhone SE and its 4-inch display all the way up to the 12.9-inch iPad Pro. With Catalyst, some apps also need to work well on the Mac, where the app needs to function in a small window all the way up to a full screen, which can be way larger than anything on iOS.
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