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YPLibraryVC.swift
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YPLibraryVC.swift
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//
// YPLibraryVC.swift
// YPImagePicker
//
// Created by Sacha Durand Saint Omer on 27/10/16.
// Copyright © 2016 Yummypets. All rights reserved.
//
import UIKit
import Photos
public class YPLibraryVC: UIViewController, YPPermissionCheckable {
internal weak var delegate: YPLibraryViewDelegate?
internal var v: YPLibraryView!
internal var isProcessing = false // true if video or image is in processing state
internal var multipleSelectionEnabled = false
internal var initialized = false
internal var selection = [YPLibrarySelection]()
internal var currentlySelectedIndex: Int = 0
internal let mediaManager = LibraryMediaManager()
internal var latestImageTapped = ""
internal let panGestureHelper = PanGestureHelper()
// MARK: - Init
public required init() {
super.init(nibName: nil, bundle: nil)
title = YPConfig.wordings.libraryTitle
}
public required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setAlbum(_ album: YPAlbum) {
mediaManager.collection = album.collection
resetMultipleSelection()
}
private func resetMultipleSelection() {
selection.removeAll()
currentlySelectedIndex = 0
multipleSelectionEnabled = false
v.assetViewContainer.setMultipleSelectionMode(on: false)
delegate?.libraryViewDidToggleMultipleSelection(enabled: false)
checkLimit()
}
func initialize() {
mediaManager.initialize()
mediaManager.v = v
if mediaManager.fetchResult != nil {
return
}
setupCollectionView()
registerForLibraryChanges()
panGestureHelper.registerForPanGesture(on: v)
registerForTapOnPreview()
refreshMediaRequest()
v.assetViewContainer.multipleSelectionButton.isHidden = !(YPConfig.maxNumberOfItems > 1)
v.maxNumberWarningLabel.text = String(format: YPConfig.wordings.warningMaxItemsLimit, YPConfig.maxNumberOfItems)
}
// MARK: - View Lifecycle
public override func loadView() {
v = YPLibraryView.xibView()
view = v
}
public override func viewDidLoad() {
super.viewDidLoad()
// When crop area changes in multiple selection mode,
// we need to update the scrollView values in order to restore
// them when user selects a previously selected item.
v.assetZoomableView.cropAreaDidChange = { [unowned self] in
if self.multipleSelectionEnabled {
self.updateCropInfo()
}
}
}
public override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
v.assetViewContainer.squareCropButton
.addTarget(self,
action: #selector(squareCropButtonTapped),
for: .touchUpInside)
v.assetViewContainer.multipleSelectionButton
.addTarget(self,
action: #selector(multipleSelectionButtonTapped),
for: .touchUpInside)
// Forces assetZoomableView to have a contentSize.
// otherwise 0 in first selection triggering the bug : "invalid image size 0x0"
// Also fits the first element to the square if the onlySquareFromLibrary = true
if !YPConfig.onlySquareFromLibrary && v.assetZoomableView.contentSize == CGSize(width: 0, height: 0) {
v.assetZoomableView.setZoomScale(1, animated: false)
}
}
public override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
pausePlayer()
NotificationCenter.default.removeObserver(self)
PHPhotoLibrary.shared().unregisterChangeObserver(self)
}
// MARK: - Crop control
@objc
func squareCropButtonTapped() {
doAfterPermissionCheck { [weak self] in
self?.v.assetViewContainer.squareCropButtonTapped()
}
}
// MARK: - Multiple Selection
@objc
func multipleSelectionButtonTapped() {
multipleSelectionEnabled = !multipleSelectionEnabled
if multipleSelectionEnabled {
if selection.isEmpty {
selection = [
YPLibrarySelection(index: currentlySelectedIndex,
cropRect: v.currentCropRect(),
scrollViewContentOffset: v.assetZoomableView!.contentOffset,
scrollViewZoomScale: v.assetZoomableView!.zoomScale)
]
}
} else {
selection.removeAll()
}
v.assetViewContainer.setMultipleSelectionMode(on: multipleSelectionEnabled)
v.collectionView.reloadData()
checkLimit()
delegate?.libraryViewDidToggleMultipleSelection(enabled: multipleSelectionEnabled)
}
// MARK: - Tap Preview
func registerForTapOnPreview() {
let tapImageGesture = UITapGestureRecognizer(target: self, action: #selector(tappedImage))
v.assetViewContainer.addGestureRecognizer(tapImageGesture)
}
@objc
func tappedImage() {
if !panGestureHelper.isImageShown {
panGestureHelper.resetToOriginalState()
// no dragup? needed? dragDirection = .up
v.refreshImageCurtainAlpha()
}
}
// MARK: - Permissions
func doAfterPermissionCheck(block:@escaping () -> Void) {
checkPermissionToAccessPhotoLibrary { hasPermission in
if hasPermission {
block()
}
}
}
func checkPermission() {
checkPermissionToAccessPhotoLibrary { [unowned self] hasPermission in
if hasPermission && !self.initialized {
self.initialize()
self.initialized = true
}
}
}
// Async beacause will prompt permission if .notDetermined
// and ask custom popup if denied.
func checkPermissionToAccessPhotoLibrary(block: @escaping (Bool) -> Void) {
// Only intilialize picker if photo permission is Allowed by user.
let status = PHPhotoLibrary.authorizationStatus()
switch status {
case .authorized:
block(true)
case .restricted, .denied:
let popup = YPPermissionDeniedPopup()
let alert = popup.popup(cancelBlock: {
block(false)
})
present(alert, animated: true, completion: nil)
case .notDetermined:
// Show permission popup and get new status
PHPhotoLibrary.requestAuthorization { s in
DispatchQueue.main.async {
block(s == .authorized)
}
}
}
}
func refreshMediaRequest() {
let options = buildPHFetchOptions()
if let collection = mediaManager.collection {
mediaManager.fetchResult = PHAsset.fetchAssets(in: collection, options: options)
} else {
mediaManager.fetchResult = PHAsset.fetchAssets(with: options)
}
if mediaManager.fetchResult.count > 0 {
changeAsset(mediaManager.fetchResult[0])
v.collectionView.reloadData()
v.collectionView.selectItem(at: IndexPath(row: 0, section: 0),
animated: false,
scrollPosition: UICollectionViewScrollPosition())
}
scrollToTop()
}
func buildPHFetchOptions() -> PHFetchOptions {
// Sorting condition
let options = PHFetchOptions()
options.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
options.predicate = YPConfig.libraryMediaType.predicate()
return options
}
func scrollToTop() {
tappedImage()
v.collectionView.contentOffset = CGPoint.zero
}
// MARK: - ScrollViewDelegate
public func scrollViewDidScroll(_ scrollView: UIScrollView) {
if scrollView == v.collectionView {
mediaManager.updateCachedAssets(in: self.v.collectionView)
}
}
func changeAsset(_ asset: PHAsset) {
mediaManager.selectedAsset = asset
latestImageTapped = asset.localIdentifier
delegate?.libraryViewStartedLoading()
DispatchQueue.global(qos: .userInitiated).async {
switch asset.mediaType {
case .image:
self.v.assetZoomableView.setImage(asset,
mediaManager: self.mediaManager,
storedCropPosition: self.fetchStoredCrop()) {
self.v.hideLoader()
self.v.hideGrid()
self.delegate?.libraryViewFinishedLoading()
self.v.assetViewContainer.refreshSquareCropButton()
}
case .video:
self.v.assetZoomableView.setVideo(asset,
mediaManager: self.mediaManager,
storedCropPosition: self.fetchStoredCrop()) {
self.v.hideLoader()
self.v.hideGrid()
self.delegate?.libraryViewFinishedLoading()
self.v.assetViewContainer.refreshSquareCropButton()
}
case .audio, .unknown:
()
}
}
}
// MARK: - Verification
private func fitsVideoLengthLimits(asset: PHAsset) -> Bool {
guard asset.mediaType == .video else {
return true
}
let tooLong = asset.duration > YPConfig.videoFromLibraryTimeLimit
let tooShort = asset.duration < YPConfig.videoMinimumTimeLimit
if tooLong || tooShort {
DispatchQueue.main.async {
let alert = tooLong ? YPAlert.videoTooLongAlert() : YPAlert.videoTooShortAlert()
self.present(alert, animated: true, completion: nil)
}
return false
}
return true
}
// MARK: - Stored Crop Position
internal func updateCropInfo(shouldUpdateOnlyIfNil: Bool = false) {
guard let selectedAssetIndex = selection.index(where: { $0.index == currentlySelectedIndex }) else {
return
}
if shouldUpdateOnlyIfNil && selection[selectedAssetIndex].scrollViewContentOffset != nil {
return
}
// Fill new values
var selectedAsset = selection[selectedAssetIndex]
selectedAsset.scrollViewContentOffset = v.assetZoomableView.contentOffset
selectedAsset.scrollViewZoomScale = v.assetZoomableView.zoomScale
selectedAsset.cropRect = v.currentCropRect()
// Replace
selection.remove(at: selectedAssetIndex)
selection.insert(selectedAsset, at: selectedAssetIndex)
}
internal func fetchStoredCrop() -> YPLibrarySelection? {
if self.multipleSelectionEnabled,
self.selection.contains(where: { $0.index == self.currentlySelectedIndex }) {
guard let selectedAssetIndex = self.selection
.index(where: { $0.index == self.currentlySelectedIndex }) else {
return nil
}
return self.selection[selectedAssetIndex]
}
return nil
}
internal func hasStoredCrop(index: Int) -> Bool {
return self.selection.contains(where: { $0.index == index })
}
// MARK: - Fetching Media
private func fetchImageAndCrop(for asset: PHAsset,
withCropRect: CGRect? = nil,
callback: @escaping (_ photo: UIImage) -> Void) {
delegate?.libraryViewStartedLoading()
let cropRect = withCropRect ?? DispatchQueue.main.sync { v.currentCropRect() }
let ts = targetSize(for: asset, cropRect: cropRect)
mediaManager.imageManager?.fetchImage(for: asset, cropRect: cropRect, targetSize: ts, callback: callback)
}
private func checkVideoLengthAndCrop(for asset: PHAsset,
withCropRect: CGRect? = nil,
callback: @escaping (_ videoURL: URL) -> Void) {
if fitsVideoLengthLimits(asset: asset) == true {
delegate?.libraryViewStartedLoading()
let normalizedCropRect = withCropRect ?? DispatchQueue.main.sync { v.currentCropRect() }
let ts = targetSize(for: asset, cropRect: normalizedCropRect)
let xCrop: CGFloat = normalizedCropRect.origin.x * CGFloat(asset.pixelWidth)
let yCrop: CGFloat = normalizedCropRect.origin.y * CGFloat(asset.pixelHeight)
let resultCropRect = CGRect(x: xCrop,
y: yCrop,
width: ts.width,
height: ts.height)
mediaManager.fetchVideoUrlAndCrop(for: asset, cropRect: resultCropRect, callback: callback)
}
}
public func selectedMedia(photoCallback: @escaping (_ photo: UIImage, _ exifMeta : [String : Any]?) -> Void,
videoCallback: @escaping (_ videoURL: URL) -> Void,
multipleItemsCallback: @escaping (_ items: [YPMediaItem]) -> Void) {
DispatchQueue.global(qos: .userInitiated).async {
// Multiple selection
if self.multipleSelectionEnabled && self.selection.count > 1 {
let selectedAssets: [(asset: PHAsset, cropRect: CGRect?)] = self.selection.map {
return (self.mediaManager.fetchResult[$0.index], $0.cropRect)
}
// Check video length
for asset in selectedAssets {
if self.fitsVideoLengthLimits(asset: asset.asset) == false {
return
}
}
// Fill result media items array
var resultMediaItems: [YPMediaItem] = []
let asyncGroup = DispatchGroup()
for asset in selectedAssets {
asyncGroup.enter()
switch asset.asset.mediaType {
case .image:
self.fetchImageAndCrop(for: asset.asset, withCropRect: asset.cropRect) { image in
let resizedImage = self.resizedImageIfNeeded(image: image)
let exifMeta = YPHelper.unwrapImageMetaAssets(asset: asset.asset)
let photo = YPMediaPhoto(image: resizedImage, exifMeta: exifMeta)
resultMediaItems.append(YPMediaItem.photo(p: photo))
asyncGroup.leave()
}
case .video:
self.checkVideoLengthAndCrop(for: asset.asset, withCropRect: asset.cropRect) { videoURL in
let videoItem = YPMediaVideo(thumbnail: thumbnailFromVideoPath(videoURL),
videoURL: videoURL)
resultMediaItems.append(YPMediaItem.video(v: videoItem))
asyncGroup.leave()
}
default:
break
}
}
asyncGroup.notify(queue: .main) {
multipleItemsCallback(resultMediaItems)
self.delegate?.libraryViewFinishedLoading()
}
} else {
let asset = self.mediaManager.selectedAsset!
switch asset.mediaType {
case .video:
self.checkVideoLengthAndCrop(for: asset, callback: { videoURL in
DispatchQueue.main.async {
self.delegate?.libraryViewFinishedLoading()
videoCallback(videoURL)
}
})
case .image:
self.fetchImageAndCrop(for: asset) { image in
DispatchQueue.main.async {
self.delegate?.libraryViewFinishedLoading()
let resizedImage = self.resizedImageIfNeeded(image: image)
let exifMeta = YPHelper.unwrapImageMetaAssets(asset: asset)
photoCallback(resizedImage, exifMeta)
}
}
case .audio, .unknown:
return
}
}
}
}
// MARK: - TargetSize
private func targetSize(for asset: PHAsset, cropRect: CGRect) -> CGSize {
let width = floor(CGFloat(asset.pixelWidth) * cropRect.width)
let height = floor(CGFloat(asset.pixelHeight) * cropRect.height)
return CGSize(width: width, height: height)
}
// Reduce image size further if needed libraryTargetImageSize is capped.
func resizedImageIfNeeded(image: UIImage) -> UIImage {
if case let YPLibraryImageSize.cappedTo(size: capped) = YPConfig.libraryTargetImageSize {
let size = cappedSize(for: image.size, cappedAt: capped)
if let resizedImage = image.resized(to: size) {
return resizedImage
}
}
return image
}
private func cappedSize(for size: CGSize, cappedAt: CGFloat) -> CGSize {
var cappedWidth: CGFloat = 0
var cappedHeight: CGFloat = 0
if size.width > size.height {
// Landscape
let heightRatio = size.height / size.width
cappedWidth = min(size.width, cappedAt)
cappedHeight = cappedWidth * heightRatio
} else if size.height > size.width {
// Portrait
let widthRatio = size.width / size.height
cappedHeight = min(size.height, cappedAt)
cappedWidth = cappedHeight * widthRatio
} else {
// Squared
cappedWidth = min(size.width, cappedAt)
cappedHeight = min(size.height, cappedAt)
}
return CGSize(width: cappedWidth, height: cappedHeight)
}
// MARK: - Player
func pausePlayer() {
v.assetZoomableView.videoView.pause()
}
// MARK: - Deinit
deinit {
PHPhotoLibrary.shared().unregisterChangeObserver(self)
}
}
extension UIImage {
func resized(to size: CGSize) -> UIImage? {
UIGraphicsBeginImageContextWithOptions(size, false, scale)
defer { UIGraphicsEndImageContext() }
draw(in: CGRect(origin: .zero, size: size))
return UIGraphicsGetImageFromCurrentImageContext()
}
}