zoom image with scrollview swift ios - ios

Question

I have a problem with zooming an image with scroll view.
If I put the scroll view on the left with width 125 and height 375, it does not zoom the image.
It only works if I put the scroll view on the center of the view.
Screenshot:
Why is the scroll view not zooming when it's on the left side?
Here is my code
var imgview:UIImageView!
var imagepicked:UIImage!
var minZoomScale:CGFloat!
let picker = UIImagePickerController()
#IBOutlet weak var scrollViewSquare: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
scrollViewSquare.delegate = self
picker.allowsEditing = false
picker.sourceType = .PhotoLibrary
}
func imagePickerController(
picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String : AnyObject])
{
imagepicked = (info[UIImagePickerControllerOriginalImage] as? UIImage)!
ImageViewInit()
dismissViewControllerAnimated(false, completion: nil)
}
#IBAction func Pick(sender: AnyObject) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
self.presentViewController(picker, animated: true, completion: nil)
}
}
func ImageViewInit(){
imgview = UIImageView()
imgview.frame = CGRectMake(0, 0, imagepicked.size.width, imagepicked.size.height)
imgview.image = imagepicked
imgview.contentMode = .ScaleAspectFit
imgview.backgroundColor = UIColor.greenColor()
scrollViewSquare.maximumZoomScale = 4;
scrollViewSquare.minimumZoomScale = 0.02;
scrollViewSquare.bounces = true;
scrollViewSquare.bouncesZoom = true;
scrollViewSquare.contentMode = .ScaleAspectFit
scrollViewSquare.contentSize = imagepicked.size
scrollViewSquare.autoresizingMask = UIViewAutoresizing.FlexibleWidth
scrollViewSquare.addSubview(imgview)
setZoomScale()
}
func setZoomScale(){
let imageViewSize = imgview.bounds.size
let scrollViewSize = scrollViewSquare.bounds.size
let widthScale = scrollViewSize.width / imageViewSize.width
let heightScale = scrollViewSize.height / imageViewSize.height
minZoomScale = max(widthScale, heightScale)
scrollViewSquare.minimumZoomScale = minZoomScale
scrollViewSquare.zoomScale = minZoomScale
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return imgview
}

Answer 1

Hello #Bensalem Ilyes,
I've tried your code and zooming does not work on simulator because the centre of pinch gesture is in the midle so pinch on scrollview is translated as simple pan gesture. I tried your code on real device and zooming works fine.
For repositioning pinch gesture on simulator:
alt+shift key