3d Touch Not Available on iPhone 6s+

Question

I am trying to add 3d touch into my application. I am trying to enable the user to use force touch on a UITableViewCell, like shown in this project. I am running this code:

if traitCollection.forceTouchCapability == UIForceTouchCapability.Available {
    registerForPreviewingWithDelegate(self, sourceView: view)
} else {
    print("unavailable")
}

I have tried running it on an iPhone 6s+, but I receive "unavailable" in my logs. Why can I not use 3d touch on a 3d touch-supported device? Thanks for your help.

when did you execute the code? at `viewDidLoad` or somewhere else/ — Cheng-Yu Hsu, Apr 23 '16 at 13:07
would you mind checking if 3D Touch is enabled on your device? go to Settings > General > Accessibility > 3D Touch — Cheng-Yu Hsu, Apr 23 '16 at 14:03
I've encountered this problem before. The solution I'm using now is overriding `traitCollectionDidChange:` in the view controller and access the `forceTouchCapability` there. — Cheng-Yu Hsu, Apr 23 '16 at 14:43
Yes! That works! If you could post an official answer, I will accept it. Thanks @Cheng-YuHsu! — Pranav Wadhwa, Apr 23 '16 at 14:47

score 6 · Accepted Answer · answered Apr 23 '16 at 14:52

Just found some reference about 3D Touch APIs: according to the 3D Touch APIs documentation, Apple suggested that developers to read forceTouchCapability in traitCollectionDidChange: delegate method.

For example, you may check the value in your view controller using:

override func traitCollectionDidChange(previousTraitCollection: UITraitCollection?) {
    super.traitCollectionDidChange(previousTraitCollection)
    switch traitCollection.forceTouchCapability {
    case .Available:
        print("Available")
    case .Unavailable:
        print("Unavailable")
    case .Unknown:
        print("Unknown")
    }
}

Hope it helps.

3d Touch Not Available on iPhone 6s+

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