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Tusker
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Code Issues 63 Pull Requests Releases Wiki Activity

Fix controls reappearing when swiping between pages in gallery

This commit is contained in:
Shadowfacts 2022-12-13 14:14:13 -05:00
parent 565d17970f
commit 0c9f6e02bd
1 changed files with 16 additions and 5 deletions
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21
Tusker/Screens/Large Image/LargeImageViewController.swift
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@ -47,6 +47,7 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
var shrinkGestureEnabled = true
private var isInitialAppearance = true
private var skipUpdatingControlsWhileZooming = false
private var prevZoomScale: CGFloat?
private var isGrayscale = false
private var contentViewSizeObservation: NSKeyValueObservation?
@ -216,9 +217,11 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
let heightScale = maxHeight / contentView.intrinsicContentSize.height
let widthScale = view.bounds.width / contentView.intrinsicContentSize.width
let minScale = min(widthScale, heightScale)
skipUpdatingControlsWhileZooming = true
scrollView.minimumZoomScale = minScale
scrollView.zoomScale = minScale
scrollView.maximumZoomScale = minScale >= 1 ? minScale + 2 : 2
skipUpdatingControlsWhileZooming = false
centerImage()
@ -248,6 +251,12 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
}
}
override func viewSafeAreaInsetsDidChange() {
super.viewSafeAreaInsetsDidChange()
// the controls view transforms take the safe area insets into account, so they need to be updated
updateControlsView()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
@ -285,7 +294,7 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
}
func updateControlsView() {
let topOffset = self.controlsVisible ? 0 : -self.topControlsView.bounds.height
let topOffset = self.controlsVisible ? 0 : -(self.topControlsView.bounds.height + self.view.safeAreaInsets.top)
self.topControlsView.transform = CGAffineTransform(translationX: 0, y: topOffset)
if self.imageDescription != nil {
let bottomOffset = self.controlsVisible ? 0 : self.descriptionTextView.bounds.height + self.view.safeAreaInsets.bottom
@ -299,10 +308,12 @@ class LargeImageViewController: UIViewController, UIScrollViewDelegate, LargeIma
func scrollViewDidZoom(_ scrollView: UIScrollView) {
let prevZoomScale = self.prevZoomScale ?? scrollView.minimumZoomScale
if scrollView.zoomScale <= scrollView.minimumZoomScale {
setControlsVisible(true, animated: true)
} else if scrollView.zoomScale > prevZoomScale {
setControlsVisible(false, animated: true)
if !skipUpdatingControlsWhileZooming {
if scrollView.zoomScale <= scrollView.minimumZoomScale {
setControlsVisible(true, animated: true)
} else if scrollView.zoomScale > prevZoomScale {
setControlsVisible(false, animated: true)
}
}
self.prevZoomScale = scrollView.zoomScale
}