UILongPressGestureRecognizer-如何在按住的同时增大尺寸

Question

I am trying to make a feature where while the user is holding their finger down, an image grows until it is a certain size when a transition occurs. I know how to make the image grow, but do not know how to make it grow ONLY WHEN the user is holding down.

Does anyone know how to make this occur? Does one need the LongPressRecognizer?

Sorry for no code, but I am just trying to figure out how to do this. Thanks so much for your help in advance!

Cheers, Theo

Answer 1

You could do it like this:

@IBOutlet weak var myImageView: UIImageView!

var startAnimation = false
func handleTap(gestureRecognizer:UIGestureRecognizer) {

        startAnimation = true
        UIView.animate(withDuration: 0.5, animations: {
            self.myImageView.frame = CGRect(x: 0, y: 0, width: 100, height: 100)
            self.view.layoutIfNeeded()
        }) { (finished) in
            self.startAnimation = false
        }
}

override func viewDidLoad() {
    super.viewDidLoad()

    let gesture = UILongPressGestureRecognizer(target: self, action: #selector(handleTap(gestureRecognizer:)))

    myImageView.isUserInteractionEnabled = true
    myImageView.addGestureRecognizer(gesture)

}