上述所有答案都是hardware constraint到A9芯片.无论如何，在Info.plist的UIRequiredDeviceCapabilities上添加ARKit添加ARKit将为您提供更好的反馈，以运行主要功能基于ARKit的应用程序.

As all answers above this is a hardware constraint to A9 chips. Anyway it is a good practice to addAdding ARKit to UIRequiredDeviceCapabilities on Info.plist will give you a better feedback running apps that primary function is ARKit based.