Swift version: 5.6
You can read a user's 3D Touch strength using the force
property of a UITouch
, which is best used when compared against the touch.maximumPossibleForce
. For example, you can divide one into the other to see how much relative strength is applied, or do a straight comparison to check to see whether the user is pressing as hard as possible.
Before you try to make use of 3D Touch, make sure it's available by checking the forceTouchCapability
of your current trait collection. Here's an example touchesMoved()
implementation that checks whether 3D Touch is available and the user is pressing hard:
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
super.touchesMoved(touches, with: event)
if let touch = touches.first {
if view.traitCollection.forceTouchCapability == .available {
if touch.force == touch.maximumPossibleForce {
// user pressed hard – do something!
}
}
}
}
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Available from iOS 7.0 – see Hacking with Swift tutorial 37
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
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