The 32 bit runtime (commonly used but misleading name, it should be called legacy) is still supported, but it's not compatible with Swift. iOS had the modern ru

The 32 bit runtime (commonly used but misleading name, it should be called legacy) is still supported, but it's not compatible with Swift. iOS had the modern runtime from the start, way before 64 bit. https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/ocrtVersionsPlatforms.html https://developer.apple.com/library/mac/documentation/Cocoa/...