Since February 2015, any new app for the App Store must be built on the iOS 8 SDK and support 64-bit code. And starting from June 1, updates to applications already in the App Store should be collected taking into account the listed requirements,” says the announcement on Apple’s official website.
The company recommends using the default “Standard Architectures” setting in Xcode so that the resulting application supports both 32-bit and 64-bit architectures.
Other materials on the topic:Apple requires all developers to switch to 64-bit code support