Apple has just officially launched the iOS 8.1. In addition to offering some additional features fuller than iOS 8, the latest mobile operating system should also be considered by the application developers.
The reason, Apple states that for the future, the creators of these applications should make their programs run on 64-bit computing.
More precisely, this policy starts in February next year. It was submitted directly through Apple's special page for developers.
In it is written "Starting February 1, 2015, the latest applications that will be uploaded to the App Store must support 64-bit computing and developed with the iOS SDK 8, including Xcode 6 or above."
Actually, not purely to be 64-bit. The developers could at least provide an application that can run on two kinds of computing, 32-bit and 64-bit. Dropbox and Google Chrome are two apps in the App Store that supports 64-bit computing.