How to Zoom Image on single tap in an iCarousel View? - ios

Question

I am trying hard to zoom image on single tap, but no success yet. I have a carousel view with 6 images which works great but i want the particular image to zoom/pop-up when tapped on the image in carousel view. Any help will be highly appreciated.

Answer 1

First Declare the TapGestureRegcognizer then addSubview in your UIImageView. use this code in your viewDidLoad:
UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleDoubleTap:)];
[doubleTap setNumberOfTapsRequired:1];
[imageview addGestureRecognizer:doubleTap];
then if you click the UIImageView single tap, call the below methods are,
- (void)handleDoubleTap:(UIGestureRecognizer *)gestureRecognizer {
// zoom in
float newScale = [myscrollview zoomScale] * 2;
if (newScale > self.myscrollview.maximumZoomScale){
newScale = self.myscrollview.minimumZoomScale;
CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
[myscrollview zoomToRect:zoomRect animated:YES];
}
else{
newScale = self.myscrollview.maximumZoomScale;
CGRect zoomRect = [self zoomRectForScale:newScale withCenter:[gestureRecognizer locationInView:gestureRecognizer.view]];
[myscrollview zoomToRect:zoomRect animated:YES];
}
}
- (CGRect)zoomRectForScale:(float)scale withCenter:(CGPoint)center {
CGRect zoomRect;
// the zoom rect is in the content view's coordinates.
// At a zoom scale of 1.0, it would be the size of the imageScrollView's bounds.
// As the zoom scale decreases, so more content is visible, the size of the rect grows.
zoomRect.size.height = [myscrollview frame].size.height / scale;
zoomRect.size.width = [myscrollview frame].size.width / scale;
// choose an origin so as to get the right center.
zoomRect.origin.x = center.x - (zoomRect.size.width / 2.0);
zoomRect.origin.y = center.y - (zoomRect.size.height / 2.0);
return zoomRect;
}
its working for me, hope its helpful.