在任何地方都没有找到任何答案后,我为 PHAsset 创建了以下扩展,它在 iOS 8.2 中运行良好,尽管我认为它在理论上很慢。尽管先前的评论之一说这已在 iOS8.2 测试版中修复,但现在 iOS8.2 发布后,我仍然存在该错误。
import Photos
import UIKit
extension PHAsset {
class func fetchAssetWithALAssetURL (alURL: NSURL) -> PHAsset? {
let phPhotoLibrary = PHPhotoLibrary.sharedPhotoLibrary()
let assetManager = PHImageManager()
var phAsset : PHAsset?
let optionsForFetch = PHFetchOptions()
optionsForFetch.includeHiddenAssets = true
var fetchResult = PHAsset.fetchAssetsWithALAssetURLs([alURL], options: optionsForFetch)
if fetchResult?.count > 0 {
return fetchResult[0] as? PHAsset
} else {
var str = alURL.absoluteString!
let startOfString = advance(find(str, "=")!, 1)
let endOfString = advance(startOfString, 36)
let range = Range<String.Index>(start:startOfString, end:endOfString)
let localIDFragment = str.substringWithRange(range)
let fetchResultForPhotostream = PHAssetCollection.fetchAssetCollectionsWithType(PHAssetCollectionType.Album, subtype: PHAssetCollectionSubtype.AlbumMyPhotoStream, options: nil)
if fetchResultForPhotostream?.count > 0 {
let photostream = fetchResultForPhotostream![0] as PHAssetCollection
let fetchResultForPhotostreamAssets = PHAsset.fetchAssetsInAssetCollection(photostream, options: optionsForFetch)
if fetchResultForPhotostreamAssets?.count >= 0 {
var stop : Bool = false
for var i = 0; i < fetchResultForPhotostreamAssets.count && !stop; i++ {
let phAssetBeingCompared = fetchResultForPhotostreamAssets[i] as PHAsset
if phAssetBeingCompared.localIdentifier.rangeOfString(localIDFragment, options: nil, range: nil, locale: nil) != nil {
phAsset = phAssetBeingCompared
stop = true
}
}
return phAsset
}
}
return nil
}
}
}