0 效果图
imagePicker.gif
1 获取系统相册列表
func getAlbumList() {
ImagePickerManager.shareManager.isAuthorized {[weak self](isAuthorized) in
if isAuthorized == false {
DispatchQueue.main.async {
self?.setupNoAuthorizedView()
}
return
}else {
//系统的智能相册
let smartAlbums = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .albumRegular, options: nil)
self?.convertCollection(smartAlbums as! PHFetchResult<PHCollection>)
//用户创建的相册
let userCollections = PHCollectionList.fetchTopLevelUserCollections(with: nil)
self?.convertCollection(userCollections)
//按照照片数量多少排序
self?.albumLists.sort(by: { item1, item2 in
item1.fetchResult.count > item2.fetchResult.count
})
DispatchQueue.main.async {
self?.pushToImagePickerVC(index: 0, animated: false)
self?.tableView.reloadData()
}
}
}
}
//将相册名称和相册中的内容对应成一个模型，
func convertCollection(_ collection: PHFetchResult<PHCollection>) {
for i in 0..<collection.count {
let resultsOptions = PHFetchOptions()
resultsOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate",
ascending: false)]
resultsOptions.predicate = NSPredicate(format: "mediaType = %d",
PHAssetMediaType.image.rawValue)
let c = collection[I]
let assetsFetchResult = PHAsset.fetchAssets(in: c as! PHAssetCollection ,
options: resultsOptions)
if let title = ImagePickerManager.albumChinseTitle(title: c.localizedTitle) {
albumLists.append(AlbumItem(title: title, fetchResult: assetsFetchResult))
}
}
}
//将获取到的相册名称转成对应的中文名称
static func albumChinseTitle(title: String?) -> String? {
guard let title = title else {
return nil
}
switch title {
case "Slo-mo":
return "慢动作"
case "Recently Added":
return "最近添加"
case "Favorites":
return "个人收藏"
case "Recently Deleted":
return "最近删除"
case "Videos":
return "视频"
case "All Photos":
return "所有照片"
case "Selfies":
return "自拍"
case "Screenshots":
return "屏幕快照"
case "Camera Roll":
return "相机胶卷"
case "Panoramas":
return "全景照片"
case "Time-lapse":
return "延时摄影"
case "Animated":
return "动图"
case "Long Exposure":
return "长曝光"
case "Portrait":
return "人像"
case "Hidden":
return nil
case "Bursts":
return "连拍快照"
default:
return title
}
}
2 展示相册列表中每个相册中的内容
创建一个UICollectionView，通过获取指定大小的图片并展示出来
import UIKit
import Photos
typealias OnCommpletedHandler = ([UIImage]?) -> Void
let bgColor = UIColor.black.withAlphaComponent(0.7)
let kScreenWidth = UIScreen.main.bounds.size.width
let kScreenHeight = UIScreen.main.bounds.size.height
let IPhoneX = UIScreen.main.bounds.size == CGSize(width: 375, height: 812)
let SafeEdge = UIEdgeInsets(top: IPhoneX ? 88 : 64, left: 0, bottom: IPhoneX ? 34 : 0, right: 0)
class ImagePickerViewController: UIViewController {
var collectionView: UICollectionView!
var bottomView: AlbumBottomView!
var albumItem: AlbumItem!
var itemWidth: CGFloat!
let cols: CGFloat = 4
let margin = 5 * k_FitWidth
typealias CancelBtnDidClick = () -> Void
var cancelClick: CancelBtnDidClick?
var completed: OnCommpletedHandler?
let maxCheckCount: Int = 3
var checkedAssets: [PHAsset] = [PHAsset]()
override func viewDidLoad() {
super.viewDidLoad()
setupNav()
setupCollectionView()
}
func setupNav() {
view.backgroundColor = UIColor.white
self.navigationItem.title = albumItem.title
self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "取消", style: .plain, target: self, action: #selector(cancel))
}
@objc func cancel() {
self.cancelClick?()
self.navigationController?.popViewController(animated: true)
}
func setupCollectionView() {
let flowLayout = UICollectionViewFlowLayout()
itemWidth = (kScreenWidth - (cols + 1) * margin) / cols
flowLayout.minimumInteritemSpacing = margin
flowLayout.minimumLineSpacing = margin
flowLayout.itemSize = CGSize(width: itemWidth, height: itemWidth)
collectionView = UICollectionView(frame: CGRect.zero, collectionViewLayout: flowLayout)
collectionView.register(AlbumItemCell.self, forCellWithReuseIdentifier: "PickerCellID")
collectionView.delegate = self
collectionView.dataSource = self
view.addSubview(collectionView)
collectionView.backgroundColor = UIColor.white
bottomView = AlbumBottomView()
view.addSubview(bottomView)
collectionView.snp.makeConstraints { (make) in
make.left.right.equalTo(view)
make.top.equalToSuperview().offset(SafeEdge.top)
make.bottom.equalToSuperview().offset(-SafeEdge.bottom - 44)
}
bottomView.snp.makeConstraints { (make) in
make.left.right.equalToSuperview()
make.bottom.equalToSuperview().offset(-SafeEdge.bottom)
make.height.equalTo(44)
}
bottomView.doneBtnClick = {[weak self] in
self?.done()
}
}
func done() {
cancel()
var imagesArr = [UIImage]()
for asset in self.checkedAssets {
ImagePickerManager.getImageFromAsset(asset: asset, finished: { (image) in
if let image = image {
imagesArr.append(image)
}
})
}
completed?(imagesArr)
}
func addAssets(asset: PHAsset, btn: UIButton) {
if self.checkedAssets.contains(asset) == false {
if self.checkedAssets.count >= maxCheckCount {
let alert = UIAlertController(title: "提醒", message: "最多可以选择\(maxCheckCount)张图片", preferredStyle: .alert)
let confirm = UIAlertAction(title: "确定", style: .default, handler: nil)
alert.addAction(confirm)
self.navigationController?.present(alert, animated: true, completion: nil)
return
}
self.checkedAssets.append(asset)
btn.isSelected = !btn.isSelected
}
bottomView.doneBtn.isEnabled = self.checkedAssets.count > 0
}
func deleteAssets(asset: PHAsset, btn: UIButton) {
if self.checkedAssets.contains(asset) == true {
guard let index = self.checkedAssets.index(of: asset) else {return}
self.checkedAssets.remove(at: index)
btn.isSelected = !btn.isSelected
}
bottomView.doneBtn.isEnabled = self.checkedAssets.count > 0
}
}
extension ImagePickerViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return albumItem.fetchResult.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "PickerCellID", for: indexPath) as! AlbumItemCell
let asset = self.albumItem.fetchResult[indexPath.row]
cell.displayData(asset: asset)
cell.checkClick = {[weak self] btn in
if btn.isSelected == false {
self?.addAssets(asset: asset, btn: btn)
}else {
self?.deleteAssets(asset: asset, btn: btn)
}
}
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let asset = self.albumItem.fetchResult[indexPath.row]
let browseVC = DetailBrowseViewController()
//获取原图
PHImageManager.default().requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: PHImageContentMode.aspectFill, options: nil) { (image, _) in
if let image = image {
browseVC.image = image
self.navigationController?.pushViewController(browseVC, animated: true)
}
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return margin
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return margin
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: margin, left: margin, bottom: margin, right: margin)
}
}
class AlbumItemCell: UICollectionViewCell {
var iconView: UIImageView!
var imageManager = PHCachingImageManager()
var asset: PHAsset!
fileprivate var checkBtn: UIButton!
typealias CheckBtnDidClick = (_ btn: UIButton) -> Void
var checkClick: CheckBtnDidClick?
override init(frame: CGRect) {
super.init(frame: frame)
iconView = UIImageView()
iconView.contentMode = .scaleAspectFill
iconView.clipsToBounds = true
contentView.addSubview(iconView)
checkBtn = UIButton()
checkBtn.setImage(UIImage(named: "check"), for: .normal)
checkBtn.setImage(UIImage(named: "checked"), for: .selected)
checkBtn.addTarget(self, action: #selector(check(btn:)), for: .touchUpInside)
addSubview(checkBtn)
iconView.snp.makeConstraints { (make) in
make.edges.equalToSuperview()
}
checkBtn.snp.makeConstraints { (make) in
make.width.height.equalTo(20)
make.top.equalToSuperview()
make.right.equalToSuperview()
}
}
@objc func check(btn: UIButton) {
checkClick?(btn)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func displayData(asset: PHAsset) {
self.imageManager.requestImage(for: asset, targetSize: self.frame.size, contentMode: PHImageContentMode.aspectFill, options: nil) { [weak self](image, info) in
if let image = image {
self?.iconView.image = image
}
}
}
}
class AlbumBottomView: UIView {
typealias SimpleCallBack = () -> Void
var doneBtnClick: SimpleCallBack?
var doneBtn: UIButton!
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = bgColor
setupUI()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func setupUI() {
doneBtn = UIButton()
doneBtn.setTitle("完成", for: .normal)
doneBtn.titleLabel?.font = UIFont.systemFont(ofSize: 14)
doneBtn.setTitleColor(UIColor.lightGray, for: .disabled)
doneBtn.setTitleColor(UIColor.white, for: .normal)
doneBtn.backgroundColor = UIColor.green.withAlphaComponent(0.5)
doneBtn.layer.cornerRadius = 5
doneBtn.layer.masksToBounds = true
doneBtn.isEnabled = false
doneBtn.addTarget(self, action: #selector(done), for: UIControlEvents.touchUpInside)
addSubview(doneBtn)
doneBtn.snp.makeConstraints { (make) in
make.width.equalTo(60)
make.height.equalTo(30)
make.right.equalToSuperview().offset(-15)
make.centerY.equalToSuperview()
}
}
@objc func done() {
self.doneBtnClick?()
}
}
