Is there a way to write an app's "Required device capabilities" such that the app runs only iPhone 6s and above (due to a requirement of force touch)?
You normally use the UIRequiredDeviceCapabilities key, which can require certain features to be present. However at this time it doesn't seem like 3D Touch has been added.
A large warning will have to suffice for now, while waiting for apple to add 3D touch as a thing you can require. Otherwise there might be some features only the new iPhones models have, such as the arm chip, you could require. I haven't looked into this though.
On apples page for documentation you can see available keys for the UIRequiredDeviceCapabilities, where 3D Touch doesn't seem to be present. open https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/iPhoneOSKeys.html#//apple_ref/doc/uid/TP40009252-SW3
No, at this time it is not possible.
It is likely that Apple will introduce a new value to use with the UIRequiredDeviceCapabilities key.
Until that time, the best you can do is require one of (arm64, metal or opengles-3), and one of something like telephony or sms (until iPads get 3D Touch). This will at least restrict your app to the iPhone 5S and up.
And put a notice in the app description that your device requires 3D Touch.
Keep an eye on this document for all the possible device capability values: https://developer.apple.com/library/ios/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/DeviceCompatibilityMatrix/DeviceCompatibilityMatrix.html
Also, this is handy: http://28byteslater.com/ios-compatibility/?exclude=&require=22,7,19,26#chart
来源：https://stackoverflow.com/questions/32810278/require-forcetouch-ios-app