Examples>Pan + Rotate a Shape
Center an Object on a Gesture
The easiest way to “drag” an object is to add a pan gesture to the canvas and have the object follow the pan.
canvas.addPanGestureRecognizer { locations, center, translation, velocity, state in
shape.center = center
}Note the use of
ShapeLayer.disableActions = true? This makes sure that the changes to the objects following it are immediate, i.e. they won’t animate.
Example
let shape = Rectangle(frame: Rect(0, 0, 240, 80))
shape.lineWidth = 40.0
canvas.add(shape)
canvas.addPanGestureRecognizer { locations, center, translation, velocity, state in
ShapeLayer.disableActions = true
shape.rotation = (self.canvas.center.x - center.x) / self.canvas.center.x * 2*M_PI
shape.center = center
}