UIImageView change UIImage on touch then restore previous UIImage

Question

So, after finding my anwser in previos question here what I would like is to add GestureRecognizer on this UIImageView. When user tap, the color change. And when he tap again default image is restored.

Any tip to do that?

I was thinking about a List that I update in each click but not sure it is the best thing to do that.

here is the GestureRecognizer

UITapGestureRecognizer CreateTouchGesture(UIImageView imageView)
{
    var touchGesture = new UITapGestureRecognizer((tg) =>
    {
        imageView.Image = DrawSelectedBorder(imageView.Image);
    });

        return touchGesture;
}

What about a class variable dictionnary with Object ID as key and the Image as Value? — Leze, Apr 14 '17 at 12:02
It's what I tryed frist, but I'm not sure is the good way to do that, anything else? — SunLiker67, Apr 14 '17 at 12:03

score 2 · Accepted Answer · answered Apr 14 '17 at 12:09

Based on comments, I can offer you this solution. You use UIImageView AnimationImages property to store you base image. And when you press again the image you retrieve it from this array. And to know in which state you are, you use Ighlighted property.

Like this :

var touchGesture = new UITapGestureRecognizer((tg) =>
{
    if(!imageView.Highlighted){
        imageView.Highlighted = true;
        imageView.AnimationImages = new UIImage[]{imageView.Image};
        imageView.Image = DrawSelectedBorder(imageView.Image);
    }else{
        imageView.Highlighted = false;
        imageView.Image = imageView.AnimationImages[0];
        System.Diagnostics.Debug.WriteLine(imageView.AccessibilityLabel);
    }
});

Thanks again Leze, i would just wait if better solution came. Testing yours and it's working. Just wandering if it's memory safe to use it like this. I have many image to manage that way in my App. — SunLiker67, Apr 14 '17 at 12:14

UIImageView change UIImage on touch then restore previous UIImage

1 Answers1