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Added visibility-effect when dragging down to show view behind

This commit is contained in:
Kevin Rummler 2016-03-16 16:47:24 +01:00
parent f443df3ddc
commit a93f945fcc
1 changed files with 10 additions and 4 deletions
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14
SKPhotoBrowser/SKPhotoBrowser.swift
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@ -241,8 +241,9 @@ public class SKPhotoBrowser: UIViewController, UIScrollViewDelegate {
public override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.clearColor()
view.backgroundColor = UIColor.blackColor()
view.clipsToBounds = true
view.opaque = false
backgroundView = UIView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight))
backgroundView.backgroundColor = .blackColor()
@ -256,7 +257,7 @@ public class SKPhotoBrowser: UIViewController, UIScrollViewDelegate {
pagingScrollView.delegate = self
pagingScrollView.showsHorizontalScrollIndicator = true
pagingScrollView.showsVerticalScrollIndicator = true
pagingScrollView.backgroundColor = UIColor.blackColor()
pagingScrollView.backgroundColor = UIColor.clearColor()
pagingScrollView.contentSize = contentSizeForPagingScrollView()
view.addSubview(pagingScrollView)
@ -698,6 +699,7 @@ public class SKPhotoBrowser: UIViewController, UIScrollViewDelegate {
// MARK: - panGestureRecognized
public func panGestureRecognized(sender: UIPanGestureRecognizer) {
backgroundView.hidden = true
let scrollView = pageDisplayedAtIndex(currentPageIndex)
let viewHeight = scrollView.frame.size.height
@ -719,12 +721,15 @@ public class SKPhotoBrowser: UIViewController, UIScrollViewDelegate {
translatedPoint = CGPoint(x: firstX, y: firstY + translatedPoint.y)
scrollView.center = translatedPoint
view.opaque = true
let minOffset = viewHalfHeight/4
let offset = 1 - (scrollView.center.y > viewHalfHeight ? scrollView.center.y - viewHalfHeight : -(scrollView.center.y - viewHalfHeight)) / viewHalfHeight
view.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(max(0.5, offset))
// gesture end
if sender.state == .Ended {
if scrollView.center.y > viewHalfHeight+40 || scrollView.center.y < viewHalfHeight-40 {
if scrollView.center.y > viewHalfHeight + minOffset || scrollView.center.y < viewHalfHeight - minOffset {
backgroundView.backgroundColor = self.view.backgroundColor
determineAndClose()
return
@ -743,6 +748,7 @@ public class SKPhotoBrowser: UIViewController, UIScrollViewDelegate {
UIView.beginAnimations(nil, context: nil)
UIView.setAnimationDuration(animationDuration)
UIView.setAnimationCurve(UIViewAnimationCurve.EaseIn)
view.backgroundColor = UIColor.blackColor()
scrollView.center = CGPoint(x: finalX, y: finalY)
UIView.commitAnimations()
}