How much is the sensitivity of 3D touch in any pressure unit? What is the max and min of the sensitivity ?

From the WWDC talks and from the docs, it appears that only minimum or short and maximum, long

press are available. I could be really wrong on this so don't take my comments as gospel but from

every doc I've read the 3D Touch is not as fine grained as specific Pascal units.

The

UITouch

class has two new properties to support custom implementation of 3D Touch in your app:

force

and

maximumPossibleForce

. These properties let you detect and respond to touch pressure in the

UIEvent

objects your app receives. The force of a touch has a high dynamic range, available to your app as a floating point value (CGFloat), where a value of

1.0

represents the force of an average touch (predetermined by the system, not user-specific).

-Max

Yes, you can detect the amount of force applied by the user.

Full documentation on the 3D Touch API, both from the gesture support layer and when pressure values are accessed directly is available here:

https://developer.apple.com/library/prerelease/ios/documentation/UserExperience/Conceptual/Adopting3DTouchOniPhone/3DTouchAPIs.html#//apple_ref/doc/uid/TP40016543-CH4-SW1

I have just run a simple test on my 6S Plus and the sensitivity is higher than I expected. The maximum value is 6.67 (for some reason) and it seems to show dozens of discrete values between 0.0 and that maximum.

Peek and Pop meant that I was only expecting three different values (maybe 0.0, 1.0 and 2.0), but it is much more granular than that.

While it seems clear we can detect many levels of pressure, these are constrained due to

run loop issues. In reality, there is little difference between a strong force touch and a long

press. Seems to me, that with the timing constraints, this places an additional burden on

our apps instead of opening new options. Now we must determine not only duration but

also pressure and fire our responses accordingly. What happens when a tap or a double

tap is hard enough to trigger that threshhold?