我创建了一个UICollection，用于显示“定制相册”中包含的一组图像。 该应用程序提供了从相机拍摄新照片的功能。 应用程序运行正常，但如果添加过多图片，则会遇到以下错误消息：
来自调试器的消息：由于内存问题而终止
这是我的CollectionView中使用的代码
class GallerieViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIImagePickerControllerDelegate, UINavigationControllerDelegate, CLLocationManagerDelegate {
...
@IBAction func btnCamera(_ sender: Any) {
if(UIImagePickerController.isSourceTypeAvailable(.camera)){
//load the camera interface
var picker : UIImagePickerController = UIImagePickerController()
picker.sourceType = UIImagePickerControllerSourceType.camera
picker.delegate = self
picker.allowsEditing = false
self.present(picker, animated: true, completion: nil)
}else{
//no camera available
var alert = UIAlertController(title: "Erreur", message: "Aucune Caméra disponible", preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default, handler: { (action: UIAlertAction!) in
alert.dismiss(animated: true, completion: nil)
}))
self.present(alert, animated: true, completion: nil)
}
}
override func viewDidLoad() {
super.viewDidLoad()
....
}
//when a cell is selected
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath){
_selectedCells.add(indexPath)
collectionView.reloadItems(at: [indexPath])
let viewVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "ViewPhotoGallerie") as! ViewPhotoGallerie
viewVC.index = indexPath.item
viewVC.photosAsset = self.photosAsset
viewVC.assetCollection = self.assetCollection
self.navigationController?.pushViewController(viewVC, animated: true)
}
}
//during startup of the view
override func viewWillAppear(_ animated: Bool) {
//fecth the photos from the collection
self.navigationController?.hidesBarsOnTap = false
if(self.assetCollection != nil){
self.photosAsset = PHAsset.fetchAssets(in: self.assetCollection, options: nil)
let photoCount = self.photosAsset.count
if photoCount == 0 {
//self.navigationItem.title = "No Photos"
} else {
//self.navigationItem.title = "\(photoCount) Photos"
}
}
//Handle no photos in the assetCollection
//...Have a label saying, no photos
self.collectionView.reloadData()
}
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell{
let cell: GalleryCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath) as! GalleryCollectionViewCell
//Modify the cell
let asset: PHAsset = self.photosAsset[indexPath.item] as PHAsset
let option = PHImageRequestOptions()
option.isNetworkAccessAllowed = true
option.isSynchronous = true
PHImageManager.default().requestImage(for: asset, targetSize: PHImageManagerMaximumSize, contentMode: .aspectFill, options: option, resultHandler: {(result:UIImage?, nil)in
cell.setThumbnailImage(thumbnailImage: result!)
})
return cell
}
//UIImagePickerControllerDelegate Methods
public func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]){
if let image: UIImage = info["UIImagePickerControllerOriginalImage"] as? UIImage {
// Create asset for the taken image and save it
PHPhotoLibrary.shared().performChanges({
let assetToCreate = PHAssetChangeRequest.creationRequestForAsset(from: image)
if let assetPlaceholder = assetToCreate.placeholderForCreatedAsset {
self.photoIdentifier = assetPlaceholder.localIdentifier // Retrive the local identifier of the photo
if let albumChangeRequest = PHAssetCollectionChangeRequest(for: self.assetCollection, assets: self.photosAsset) {
albumChangeRequest.addAssets(([assetPlaceholder] as NSArray?)!)
//save Photo Object in memory
let encodedData = NSKeyedArchiver.archivedData(withRootObject: PhotoGallery.sharedInstance.photoGallery)
}
}
},
completionHandler: {(success, error) -> Void in
NSLog("Adding Image to library > %@", (success ? "Success":"Error"))
DispatchQueue.main.async {
picker.dismiss(animated: true, completion: nil)
}
})
}
}
public func imagePickerControllerDidCancel(_ picker: UIImagePickerController){
picker.dismiss(animated: true, completion: nil)
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
let paddingSpace = sectionInsets.left * (itemsPerRow + 1)
let availableWidth = view.frame.width - paddingSpace
let widthPerItem = availableWidth / itemsPerRow
return CGSize(width: widthPerItem, height: widthPerItem)
}
}
我不确定为什么会出现这种错误，可能是我必须减小CollectionView单元格上显示的缩略图的大小，还是可能需要在拍摄照片并释放相机后释放内存？