问题描述
我有一个集合视图可以在主 viewController 上提供一个 imageView。 我有三个问题：
1-我被迫在 collectionView 中使用“highQualityFormat”，因为我无法在 didSeleect 函数上获取原始图像。有什么方法可以获取原始图像？
2- 在 phAssetCollection 中，我们不能将 sortDescriptors 与 creationDate 一起使用。如何对图像进行排序？ startDate 和 endDate 无效。
3-如何在第一个 uiviewController 中加载选定的图像，而不是使用 userManager.shared 和 notificationCenter。 感谢您的关注。
主视图控制器：
@IBOutlet weak var frontpic: UIImageView!
@IBAction func openPictureDialog(_ sender: Any) {
if !isLoadSoNew(){return}
selectedPic = 1
let storyboard = UIStoryboard(name: "Main",bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "collectionVc1")//
present(vc,animated: true,completion: nil)
}
@objc func fillFront(_ notification:Notification){
frontpic.contentMode = .scaleAspectFit
frontpic.image = UserManager.shared.collectionViewImage
}
uicollection 视图：
import UIKit
import Photos
class collectionVewControl: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource {
@IBOutlet weak var collectionView1: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
collectionView1.delegate = self
collectionView1.dataSource = self
fetchCustomAlbumPhotos()
collectionView1.frame.size.height = view.frame.height-60
}
var imageArray = [UIImage]()
var photo: UIImage? @IBAction func backButton(_ sender: Any) {
self.dismiss(animated: true,completion: nil)
}
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell",for: indexPath)
let imageView = cell.viewWithTag(1) as! UIImageView
imageView.image = imageArray[indexPath.row]
return cell
}
func collectionView(_ collectionView: UICollectionView,didSelectItemAt indexPath: IndexPath) {
UserManager.shared.collectionViewImage = imageArray[indexPath.row]
NotificationCenter.default.post(name: Notification.Name(rawValue: "fillFront"),object: nil)
self.dismiss(animated: true,completion: nil)
}
func fetchCustomAlbumPhotos()
{
var albumName = "APKSoft"
var assetCollection = PHAssetCollection()
var photoAssets = PHFetchResult<AnyObject>()
let fetchOptions = PHFetchOptions()
fetchOptions.predicate = nspredicate(format: "title = %@",albumName)
// fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate",ascending: true)]
let collection:PHFetchResult = PHAssetCollection.fetchAssetCollections(with: .album,subtype: .any,options: fetchOptions)
if let firstObject = collection.firstObject{
//found the album
assetCollection = firstObject
}
else {
albumName = "Recents"
if let firstObject = collection.firstObject{
assetCollection = firstObject
}
}
_ = collection.count
photoAssets = PHAsset.fetchAssets(in: assetCollection,options: nil) as! PHFetchResult<AnyObject>
let imageManager = PHCachingImageManager()
photoAssets.enumerateObjects{(object: AnyObject!,count: Int,stop: UnsafeMutablePointer<ObjCBool>) in
if object is PHAsset{
let asset = object as! PHAsset
// print("Inside If object is PHAsset,This is number 1")
let imageSize = CGSize(width: asset.pixelWidth,height: asset.pixelHeight)
/* For faster performance,and maybe degraded image */
let options = PHImageRequestOptions()
options.deliveryMode = .highQualityFormat
options.isSynchronous = true
imageManager.requestimage(for: asset,targetSize: imageSize,contentMode: .aspectFill,options: options,resultHandler: {
(image,info) -> Void in
self.photo = image!
/* The image is Now available to us */
self.addImgToArray(uploadImage: self.photo!)
// print("enum for image,This is number 2")
})
}
}
}
func addImgToArray(uploadImage:UIImage)
{
self.imageArray.append(uploadImage)
}
}
解决方法
我找到了我自己问题的第二部分的解决方案。 我不得不将 fetchOption 用于 phAsset 而不是 phAssetCollection，这是我的错误。
_ = collection.count
fetchOptions1.sortDescriptors = [NSSortDescriptor(key: "creationDate",ascending: false)]
photoAssets = PHAsset.fetchAssets(in: assetCollection,options: fetchOptions1) as! PHFetchResult<AnyObject>
嗨，我现在可以回答你的第三个问题，其他的我不确定。
您可以使用协议和委托将图像传递给前一个视图控制器。
您可以查看此Medium post。