[英]List all photo albums in iOS
我需要在 iPhone 上獲取所有相冊。
我知道我可以啟動一個圖像選擇器讓用戶從中選擇一個圖像。 但我需要開發自己的圖像瀏覽器。
我發現的所有代碼都適用於圖像選擇器,或者他們已經知道專輯名稱。
我需要首先列出所有相冊名稱,然后用戶將選擇其中一個,然后我將在該相冊中顯示圖像。
所有這些步驟都將在自定義布局中完成。
我可以列出所有相冊嗎?
用圖像計數列出所有相冊的簡單方法。
class AlbumModel {
let name:String
let count:Int
let collection:PHAssetCollection
init(name:String, count:Int, collection:PHAssetCollection) {
self.name = name
self.count = count
self.collection = collection
}
}
func listAlbums() {
var album:[AlbumModel] = [AlbumModel]()
let options = PHFetchOptions()
let userAlbums = PHAssetCollection.fetchAssetCollections(with: .album, subtype: .any, options: options)
userAlbums.enumerateObjects{ (object: AnyObject!, count: Int, stop: UnsafeMutablePointer) in
if object is PHAssetCollection {
let obj:PHAssetCollection = object as! PHAssetCollection
let fetchOptions = PHFetchOptions()
fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)
let newAlbum = AlbumModel(name: obj.localizedTitle!, count: obj.estimatedAssetCount, collection:obj)
album.append(newAlbum)
}
}
for item in album {
print(item)
}
}
我用它來獲得幾張專輯,但你可以獲得更多:
private func setupPhotos() {
let fetchOptions = PHFetchOptions()
let smartAlbums = PHAssetCollection.fetchAssetCollections(with: .smartAlbum, subtype: .any, options: fetchOptions)
let topLevelUserCollections = PHCollectionList.fetchTopLevelUserCollections(with: fetchOptions)
let allAlbums = [topLevelUserCollections, smartAlbums]
allAlbums.enumerateObjects {(assetCollection, index, stop) in
if #available(iOS 9.0, *) {
fetchOptions.fetchLimit = 1
}
let assets = PHAsset.fetchAssets(in: assetCollection, options: fetchOptions)
if let _ = assets.firstObject {
let assetObject = MYSpecialAssetContainerStruct(asset: assets)
self.myDataArray.append(assetObject)
}
}
self.myDataArray.sortInPlace {(a, b) in
return a.asset.localizedTitle < b.asset.localizedTitle
}
tableView.reloadData()
}
編輯:這將為您提供專輯的PHAssetCollections
,然后我將它們放在具有此方法的單元格中,以從專輯中獲取最新的圖像縮略圖。
private func downloadAndSetImage(asset: MYSpecialAssetContainerStruct) {
guard asset.thumbnail == nil else {
albumImage.image = asset.thumbnail
return
}
let imageRequestOptions = PHImageRequestOptions()
imageRequestOptions.isNetworkAccessAllowed = false
imageRequestOptions.isSynchronous = true
imageRequestOptions.deliveryMode = .highQualityFormat
PHImageManager.default().requestImage(
for: asset.asset,
targetSize: CGSize(width: 200, height: 200),
contentMode: .aspectFit,
options: imageRequestOptions,
resultHandler: {(img, info) in
asset.thumbnail = img
self.albumImage.image = asset.thumbnail
}
)
}
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