Tusker/Tusker/Screens/Large Image/LargeImageViewController.swift

239 lines
8.4 KiB
Swift
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//
// LargeImageViewController.swift
// Tusker
//
// Created by Shadowfacts on 8/31/18.
// Copyright © 2018 Shadowfacts. All rights reserved.
//
import UIKit
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import Pachyderm
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import Photos
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import Gifu
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class LargeImageViewController: UIViewController, UIScrollViewDelegate {
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typealias SourceInfo = (image: UIImage, frame: CGRect, cornerRadius: CGFloat)
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var sourceInfo: SourceInfo?
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var dismissInteractionController: LargeImageInteractionController?
@IBOutlet weak var scrollView: UIScrollView!
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@IBOutlet weak var imageView: GIFImageView!
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@IBOutlet weak var imageViewLeadingConstraint: NSLayoutConstraint!
@IBOutlet weak var imageViewTrailingConstraint: NSLayoutConstraint!
@IBOutlet weak var imageViewTopConstraint: NSLayoutConstraint!
@IBOutlet weak var imageViewBottomConstraint: NSLayoutConstraint!
@IBOutlet weak var topControlsView: UIView!
@IBOutlet weak var topControlsHeightConstraint: NSLayoutConstraint!
@IBOutlet weak var shareButton: UIButton!
@IBOutlet weak var shareButtonTopConstraint: NSLayoutConstraint!
@IBOutlet weak var shareButtonLeadingConstraint: NSLayoutConstraint!
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@IBOutlet weak var closeButton: UIButton!
@IBOutlet weak var closeButtonTopConstraint: NSLayoutConstraint!
@IBOutlet weak var closeButtonTrailingConstraint: NSLayoutConstraint!
@IBOutlet weak var bottomControlsView: UIView!
@IBOutlet weak var descriptionLabel: UILabel!
var initializedTopControlsConstrains = false
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var image: UIImage?
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var gifData: Data?
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var imageDescription: String?
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var initialControlsVisible = true
private(set) var controlsVisible = true {
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didSet {
setNeedsUpdateOfHomeIndicatorAutoHidden()
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}
}
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var shrinkGestureEnabled = true
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var prevZoomScale: CGFloat?
override var prefersStatusBarHidden: Bool {
return true
}
override var prefersHomeIndicatorAutoHidden: Bool {
return !controlsVisible
}
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init(image: UIImage, description: String?, sourceInfo: SourceInfo?) {
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self.image = image
self.imageDescription = description
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self.sourceInfo = sourceInfo
super.init(nibName: "LargeImageViewController", bundle: nil)
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modalPresentationStyle = .fullScreen
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}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
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override func viewDidLoad() {
super.viewDidLoad()
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setControlsVisible(initialControlsVisible, animated: false)
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imageView.image = image
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if let gifData = gifData {
imageView.animate(withGIFData: gifData)
}
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scrollView.delegate = self
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imageView.bounds = CGRect(origin: .zero, size: imageView.image!.size)
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if let imageDescription = imageDescription {
descriptionLabel.text = imageDescription
} else {
bottomControlsView.isHidden = true
}
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if shrinkGestureEnabled {
dismissInteractionController = LargeImageInteractionController(viewController: self)
}
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view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(scrollViewPressed(_:))))
let doubleTap = UITapGestureRecognizer(target: self, action: #selector(scrollViewDoubleTapped(_:)))
doubleTap.numberOfTapsRequired = 2
view.addGestureRecognizer(doubleTap)
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}
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override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
// limit the image height to the safe area height, so the image doesn't overlap the top controls
// while zoomed all the way out
let maxHeight = view.bounds.height - view.safeAreaInsets.top - view.safeAreaInsets.bottom
let heightScale = maxHeight / imageView.bounds.height
let widthScale = view.bounds.width / imageView.bounds.width
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let minScale = min(widthScale, heightScale)
scrollView.minimumZoomScale = minScale
scrollView.zoomScale = minScale
scrollView.maximumZoomScale = minScale >= 1 ? minScale + 2 : 2
centerImage()
if !initializedTopControlsConstrains {
initializedTopControlsConstrains = true
if view.safeAreaInsets.top == 44 {
// running on iPhone X style notched device
let notchWidth: CGFloat = 209
let earWidth = (view.bounds.width - notchWidth) / 2
let offset = (earWidth - shareButton.bounds.width) / 2
shareButtonLeadingConstraint.constant = offset
closeButtonTrailingConstraint.constant = offset
}
}
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}
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func setControlsVisible(_ controlsVisible: Bool, animated: Bool) {
self.controlsVisible = controlsVisible
if animated {
UIView.animate(withDuration: 0.2) {
self.updateControlsView()
}
} else {
updateControlsView()
}
}
func updateControlsView() {
let topOffset = self.controlsVisible ? 0 : -self.topControlsView.bounds.height
self.topControlsView.transform = CGAffineTransform(translationX: 0, y: topOffset)
if self.imageDescription != nil {
let bottomOffset = self.controlsVisible ? 0 : self.bottomControlsView.bounds.height + self.view.safeAreaInsets.bottom
self.bottomControlsView.transform = CGAffineTransform(translationX: 0, y: bottomOffset)
}
}
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func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return imageView
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
centerImage()
let prevZoomScale = self.prevZoomScale ?? scrollView.minimumZoomScale
if scrollView.zoomScale <= scrollView.minimumZoomScale {
setControlsVisible(true, animated: true)
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} else if scrollView.zoomScale > prevZoomScale {
setControlsVisible(false, animated: true)
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}
self.prevZoomScale = scrollView.zoomScale
}
func centerImage() {
let yOffset = max(0, (view.bounds.size.height - imageView.frame.height) / 2)
imageViewTopConstraint.constant = yOffset
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let xOffset = max(0, (view.bounds.size.width - imageView.frame.width) / 2)
imageViewLeadingConstraint.constant = xOffset
}
func zoomRectFor(scale: CGFloat, center: CGPoint) -> CGRect {
var zoomRect = CGRect.zero
zoomRect.size.width = imageView.frame.width / scale
zoomRect.size.height = imageView.frame.height / scale
let newCenter = scrollView.convert(center, to: imageView)
zoomRect.origin.x = newCenter.x - (zoomRect.width / 2)
zoomRect.origin.y = newCenter.y - (zoomRect.height / 2)
return zoomRect
}
func animateZoomOut() {
UIView.animate(withDuration: 0.3, animations: {
self.scrollView.zoomScale = self.scrollView.minimumZoomScale
self.view.layoutIfNeeded()
})
}
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@objc func scrollViewPressed(_ sender: UITapGestureRecognizer) {
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if scrollView.zoomScale > scrollView.minimumZoomScale {
animateZoomOut()
} else {
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setControlsVisible(!controlsVisible, animated: true)
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}
}
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@objc func scrollViewDoubleTapped(_ recognizer: UITapGestureRecognizer) {
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if scrollView.zoomScale <= scrollView.minimumZoomScale {
let point = recognizer.location(in: recognizer.view)
let scale: CGFloat
if scrollView.minimumZoomScale < 1 {
if 1 - scrollView.zoomScale <= 0.5 {
scale = scrollView.zoomScale + 1
} else {
scale = 1
}
} else {
scale = scrollView.maximumZoomScale
}
let rect = zoomRectFor(scale: scale, center: point)
UIView.animate(withDuration: 0.3) {
self.scrollView.zoom(to: rect, animated: false)
self.view.layoutIfNeeded()
}
} else {
animateZoomOut()
}
}
@IBAction func closeButtonPressed(_ sender: Any) {
dismiss(animated: true)
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}
@IBAction func sharePressed(_ sender: Any) {
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guard let image = image else { return }
let activityVC = UIActivityViewController(activityItems: [image], applicationActivities: nil)
present(activityVC, animated: true)
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}
}