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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // AlbumDetailController.swift | ||
| // LPAlbum | ||
| // | ||
| // Created by 郜宇 on 2017/9/12. | ||
| // Copyright © 2017年 Loopeer. All rights reserved. | ||
| // | ||
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| import UIKit | ||
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| class PhotosPreviewController: UIViewController { | ||
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| var assetModels: [AssetModel]! | ||
| var currentIndex: Int! | ||
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| var chooseAction: ((AssetModel, Int) -> Void)? | ||
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| fileprivate var collectionView: UICollectionView! | ||
| fileprivate let itemPadding: CGFloat = 20.0 | ||
| fileprivate let chooseButton = UIButton() | ||
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
| setupUI() | ||
| } | ||
| } | ||
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| extension PhotosPreviewController { | ||
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| func setupUI(){ | ||
| // 将collectionView多余的部分切到 | ||
| view.clipsToBounds = true | ||
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| chooseButton.frame = CGRect(x: 0, y: 0, width: 25, height: 25) | ||
| chooseButton.setBackgroundImage(LPAlbum.Style.selectedBox, for: .selected) | ||
| chooseButton.setBackgroundImage(LPAlbum.Style.normalBox, for: .normal) | ||
| chooseButton.isSelected = assetModels[currentIndex].isSelect | ||
| chooseButton.addTarget(self, action: #selector(chooseClick), for: .touchUpInside) | ||
| navigationItem.rightBarButtonItem = UIBarButtonItem(customView: chooseButton) | ||
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| let layout = UICollectionViewFlowLayout() | ||
| let itemSize = CGSize(width: view.bounds.width + 20, height: view.bounds.height - 64) | ||
| layout.itemSize = itemSize | ||
| layout.minimumLineSpacing = 0 | ||
| layout.minimumInteritemSpacing = 0 | ||
| layout.scrollDirection = .horizontal | ||
| collectionView = UICollectionView(frame: CGRect(x: -10, y: 0, width: itemSize.width, height: itemSize.height), | ||
| collectionViewLayout: layout) | ||
| collectionView.isPagingEnabled = true | ||
| collectionView.showsHorizontalScrollIndicator = false | ||
| collectionView.delegate = self | ||
| collectionView.dataSource = self | ||
| view.addSubview(collectionView) | ||
| collectionView.register(PhotoPreviewCell.self, forCellWithReuseIdentifier: PhotoPreviewCell.description()) | ||
| collectionView.performBatchUpdates(nil){ _ in | ||
| self.collectionView.setContentOffset(CGPoint(x: itemSize.width * self.currentIndex.cgFloat, y: 0), animated: false) | ||
| } | ||
| } | ||
| func chooseClick() { | ||
| chooseButton.isSelected = !chooseButton.isSelected | ||
| assetModels[currentIndex].isSelect = chooseButton.isSelected | ||
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| var model = assetModels[currentIndex] | ||
| model.isSelect = chooseButton.isSelected | ||
| chooseAction?(model, currentIndex) | ||
| } | ||
| } | ||
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| extension PhotosPreviewController: UICollectionViewDelegate, UICollectionViewDataSource { | ||
| func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { | ||
| return assetModels.count | ||
| } | ||
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| func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { | ||
| let cell = collectionView.dequeueReusableCell(withReuseIdentifier: PhotoPreviewCell.description(), for: indexPath) as! PhotoPreviewCell | ||
| cell.assetModel = assetModels[indexPath.row] | ||
| return cell | ||
| } | ||
| func collectionView(_ collectionView: UICollectionView, didEndDisplaying cell: UICollectionViewCell, forItemAt indexPath: IndexPath) { | ||
| (cell as? PhotoPreviewCell)?.resetZoomScale() | ||
| } | ||
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| func scrollViewDidScroll(_ scrollView: UIScrollView) { | ||
| currentIndex = (scrollView.contentOffset.x / scrollView.bounds.width).roundInt | ||
| chooseButton.isSelected = assetModels[currentIndex].isSelect | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| // | ||
| // PhotoPreviewCell.swift | ||
| // LPAlbum | ||
| // | ||
| // Created by 郜宇 on 2017/9/14. | ||
| // Copyright © 2017年 Loopeer. All rights reserved. | ||
| // | ||
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| import UIKit | ||
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| class PhotoPreviewCell: UICollectionViewCell { | ||
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| var assetModel: AssetModel! { | ||
| didSet{ | ||
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| AlbumManager.getPhoto(asset: assetModel.asset, targetSize: bounds.size) { (image, _) in | ||
| self.photoView.image = image | ||
| } | ||
| } | ||
| } | ||
| func resetZoomScale() { scrollView.setZoomScale(1.0, animated: false) } | ||
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| fileprivate let photoView = UIImageView() | ||
| fileprivate let scrollView = UIScrollView() | ||
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| override init(frame: CGRect) { | ||
| super.init(frame: frame) | ||
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| scrollView.frame = bounds.insetBy(dx: 10, dy: 0) | ||
| scrollView.minimumZoomScale = 1 | ||
| scrollView.maximumZoomScale = 3 | ||
| scrollView.bouncesZoom = true | ||
| scrollView.delaysContentTouches = true | ||
| scrollView.canCancelContentTouches = true | ||
| scrollView.delegate = self | ||
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| photoView.contentMode = .scaleAspectFit | ||
| photoView.frame = scrollView.bounds | ||
| scrollView.addSubview(photoView) | ||
| contentView.addSubview(scrollView) | ||
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| } | ||
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| required init?(coder aDecoder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
| } | ||
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| extension PhotoPreviewCell: UIScrollViewDelegate { | ||
| func viewForZooming(in scrollView: UIScrollView) -> UIView? { | ||
| return photoView | ||
| } | ||
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| func scrollViewWillBeginZooming(_ scrollView: UIScrollView, with view: UIView?) { | ||
| scrollView.contentInset = .zero | ||
| } | ||
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| func scrollViewDidZoom(_ scrollView: UIScrollView) { | ||
| // let scrollViewW = scrollView.frame.width | ||
| // let scrollViewH = scrollView.frame.height | ||
| // let contentSizeW = scrollView.contentSize.width | ||
| // let contentSizeH = scrollView.contentSize.height | ||
| // | ||
| // let offsetX = scrollViewW > contentSizeW ? scrollViewW - contentSizeW * 0.5 : 0 | ||
| // let offsetY = scrollViewH > contentSizeH ? scrollViewH - contentSizeH * 0.5 : 0 | ||
| // photoView.center = CGPoint(x: contentSizeW * 0.5 + offsetX, y: contentSizeH * 0.5 + offsetY) | ||
| } | ||
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| } | ||
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