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State Switching

Author
Travis Kirton

Tags
interaction, longpress

State Switching

Every gesture has the following states:

.Began
.Changed
.Ended
.Possible
.Cancelled
.Failed

You’ll mostly be using the top 3, and when you do this is how you do it:

obj.addLongPressGestureRecognizer { locations, center, state {
	switch state {
	case .Began:
	    //do stuff
	case .Changed: 
	    // do stuff
	case .Ended: 
	    // do stuff
    }
}

Minimum Press Duration

By default, a long press gesture takes 0.25s to trigger. That means the user needs to hold down for that long before the .Began state triggers. However, you can easily change that time like this:

press.minimumPressDuration = 0.0

Example

let c = Circle(center: canvas.center, radius: canvas.height/3)
c.lineWidth = 40.0
let press = c.addLongPressGestureRecognizer { locations, center, state in
    switch state {
    case .Began, .Changed:
        c.fillColor = Color(red: random01(), green: random01(), blue: random01(), alpha: 1.0)
        c.strokeColor = Color(red: random01(), green: random01(), blue: random01(), alpha: 1.0)
    default:
        c.fillColor = C4Blue
        c.strokeColor = C4Purple
    }
}
press.minimumPressDuration = 0.0
canvas.add(c)

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