Swift 3 - 从图库中获取所有照片
Swift 3 - Fetch All Photos From Library
我试过从图书馆取照片。它有效,但我只从图书馆的 9 张照片中得到了 3 张照片。这是我的代码:
let options = PHFetchOptions()
let userAlbums = PHAssetCollection.fetchAssetCollections(with: PHAssetCollectionType.album, subtype: PHAssetCollectionSubtype.any, options: options)
let userPhotos = PHAsset.fetchKeyAssets(in: userAlbums.firstObject!, options: nil)
let imageManager = PHCachingImageManager()
userPhotos?.enumerateObjects({ (object: AnyObject!, count: Int, stop: UnsafeMutablePointer) in
if object is PHAsset {
let obj:PHAsset = object as! PHAsset
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)
let options = PHImageRequestOptions()
options.deliveryMode = .fastFormat
options.isSynchronous = true
imageManager.requestImage(for: obj, targetSize: CGSize(width: obj.pixelWidth, height: obj.pixelHeight), contentMode: .aspectFill, options: options, resultHandler: { img, info in
self.images.append(img!)
})
}
})
当我尝试images.count
时,它说3。任何人都可以帮我找到我的错误并获得所有照片吗?非常感谢!
首先在 info.plist 中检查您的应用是否有权访问图库中的照片。比使用下面的代码访问所有照片:
PHPhotoLibrary.requestAuthorization { (status) in
switch status {
case .authorized:
print("You Are Authrized To Access")
let fetchOptions = PHFetchOptions()
let allPhotos = PHAsset.fetchAssets(with: .image, options: fetchOptions)
print("Found number of: \(allPhotos.count) images")
case .denied, .restricted:
print("Not allowed")
case .notDetermined:
print("Not determined yet")
}
}
试试这个,
首先导入照片
import Photos
然后在 viewDidLoad() 之前声明存储照片的数组
var allPhotos : PHFetchResult<PHAsset>? = nil
现在编写在 viewDidLoad() 中获取照片的代码
/// Load Photos
PHPhotoLibrary.requestAuthorization { (status) in
switch status {
case .authorized:
print("Good to proceed")
let fetchOptions = PHFetchOptions()
self.allPhotos = PHAsset.fetchAssets(with: .image, options: fetchOptions)
case .denied, .restricted:
print("Not allowed")
case .notDetermined:
print("Not determined yet")
}
}
现在编写此代码以显示数组中的图像
/// Display Photo
let asset = allPhotos?.object(at: indexPath.row)
self.imageview.fetchImage(asset: asset!, contentMode: .aspectFit, targetSize: self.imageview.frame.size)
// Or Display image in Collection View cell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "photoCell", for: indexPath) as! SelectPhotoCell
let asset = allPhotos?.object(at: indexPath.row)
cell.imgPicture.fetchImage(asset: asset!, contentMode: .aspectFit, targetSize: cell.imgPicture.frame.size)
return cell
}
extension UIImageView{
func fetchImage(asset: PHAsset, contentMode: PHImageContentMode, targetSize: CGSize) {
let options = PHImageRequestOptions()
options.version = .original
PHImageManager.default().requestImage(for: asset, targetSize: targetSize, contentMode: contentMode, options: options) { image, _ in
guard let image = image else { return }
switch contentMode {
case .aspectFill:
self.contentMode = .scaleAspectFill
case .aspectFit:
self.contentMode = .scaleAspectFit
}
self.image = image
}
}
}
Swift 5 - 更新
首先导入照片
Import Photos
创建一个变量来保存所有图像
var images = [UIImage]()
获取资产并从资产中请求图像的主要功能
fileprivate func getPhotos() {
let manager = PHImageManager.default()
let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = false
requestOptions.deliveryMode = .highQualityFormat
// .highQualityFormat will return better quality photos
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
let results: PHFetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions)
if results.count > 0 {
for i in 0..<results.count {
let asset = results.object(at: i)
let size = CGSize(width: 700, height: 700)
manager.requestImage(for: asset, targetSize: size, contentMode: .aspectFill, options: requestOptions) { (image, _) in
if let image = image {
self.images.append(image)
self.collectionView.reloadData()
} else {
print("error asset to image")
}
}
}
} else {
print("no photos to display")
}
}
我试过从图书馆取照片。它有效,但我只从图书馆的 9 张照片中得到了 3 张照片。这是我的代码:
let options = PHFetchOptions()
let userAlbums = PHAssetCollection.fetchAssetCollections(with: PHAssetCollectionType.album, subtype: PHAssetCollectionSubtype.any, options: options)
let userPhotos = PHAsset.fetchKeyAssets(in: userAlbums.firstObject!, options: nil)
let imageManager = PHCachingImageManager()
userPhotos?.enumerateObjects({ (object: AnyObject!, count: Int, stop: UnsafeMutablePointer) in
if object is PHAsset {
let obj:PHAsset = object as! PHAsset
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)
let options = PHImageRequestOptions()
options.deliveryMode = .fastFormat
options.isSynchronous = true
imageManager.requestImage(for: obj, targetSize: CGSize(width: obj.pixelWidth, height: obj.pixelHeight), contentMode: .aspectFill, options: options, resultHandler: { img, info in
self.images.append(img!)
})
}
})
当我尝试images.count
时,它说3。任何人都可以帮我找到我的错误并获得所有照片吗?非常感谢!
首先在 info.plist 中检查您的应用是否有权访问图库中的照片。比使用下面的代码访问所有照片:
PHPhotoLibrary.requestAuthorization { (status) in
switch status {
case .authorized:
print("You Are Authrized To Access")
let fetchOptions = PHFetchOptions()
let allPhotos = PHAsset.fetchAssets(with: .image, options: fetchOptions)
print("Found number of: \(allPhotos.count) images")
case .denied, .restricted:
print("Not allowed")
case .notDetermined:
print("Not determined yet")
}
}
试试这个,
首先导入照片
import Photos
然后在 viewDidLoad() 之前声明存储照片的数组
var allPhotos : PHFetchResult<PHAsset>? = nil
现在编写在 viewDidLoad() 中获取照片的代码
/// Load Photos
PHPhotoLibrary.requestAuthorization { (status) in
switch status {
case .authorized:
print("Good to proceed")
let fetchOptions = PHFetchOptions()
self.allPhotos = PHAsset.fetchAssets(with: .image, options: fetchOptions)
case .denied, .restricted:
print("Not allowed")
case .notDetermined:
print("Not determined yet")
}
}
现在编写此代码以显示数组中的图像
/// Display Photo
let asset = allPhotos?.object(at: indexPath.row)
self.imageview.fetchImage(asset: asset!, contentMode: .aspectFit, targetSize: self.imageview.frame.size)
// Or Display image in Collection View cell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "photoCell", for: indexPath) as! SelectPhotoCell
let asset = allPhotos?.object(at: indexPath.row)
cell.imgPicture.fetchImage(asset: asset!, contentMode: .aspectFit, targetSize: cell.imgPicture.frame.size)
return cell
}
extension UIImageView{
func fetchImage(asset: PHAsset, contentMode: PHImageContentMode, targetSize: CGSize) {
let options = PHImageRequestOptions()
options.version = .original
PHImageManager.default().requestImage(for: asset, targetSize: targetSize, contentMode: contentMode, options: options) { image, _ in
guard let image = image else { return }
switch contentMode {
case .aspectFill:
self.contentMode = .scaleAspectFill
case .aspectFit:
self.contentMode = .scaleAspectFit
}
self.image = image
}
}
}
Swift 5 - 更新
首先导入照片
Import Photos
创建一个变量来保存所有图像
var images = [UIImage]()
获取资产并从资产中请求图像的主要功能
fileprivate func getPhotos() {
let manager = PHImageManager.default()
let requestOptions = PHImageRequestOptions()
requestOptions.isSynchronous = false
requestOptions.deliveryMode = .highQualityFormat
// .highQualityFormat will return better quality photos
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
let results: PHFetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions)
if results.count > 0 {
for i in 0..<results.count {
let asset = results.object(at: i)
let size = CGSize(width: 700, height: 700)
manager.requestImage(for: asset, targetSize: size, contentMode: .aspectFill, options: requestOptions) { (image, _) in
if let image = image {
self.images.append(image)
self.collectionView.reloadData()
} else {
print("error asset to image")
}
}
}
} else {
print("no photos to display")
}
}