private static PHAssetCollection FindOrCreateAlbum(string albumName)
{
var albums = PHAssetCollection.FetchAssetCollections(PHAssetCollectionType.Album, PHAssetCollectionSubtype.AlbumRegular, null);
var customAlbum = (PHAssetCollection)albums.FirstOrDefault(s => ((PHAssetCollection)s).LocalizedTitle.Equals(albumName));
if (customAlbum == null)
{
var success = PHPhotoLibrary.SharedPhotoLibrary.PerformChangesAndWait(
() =>
{
PHAssetCollectionChangeRequest.CreateAssetCollection(albumName);
}, out var error
);
if (success)
{
albums = PHAssetCollection.FetchAssetCollections(PHAssetCollectionType.Album, PHAssetCollectionSubtype.AlbumRegular, null);
customAlbum = (PHAssetCollection)albums.FirstOrDefault(s => ((PHAssetCollection)s).LocalizedTitle.Equals(albumName));
}
else
{
Console.WriteLine(error);
customAlbum = null;
}
}
return(customAlbum);
}
void AddAlbum(object sender, EventArgs args)
{
var alertController = UIAlertController.Create("New Album", null, UIAlertControllerStyle.Alert);
alertController.AddTextField(textField =>
{
textField.Placeholder = "Album Name";
});
alertController.AddAction(UIAlertAction.Create("Create", UIAlertActionStyle.Default, action =>
{
var textField = alertController.TextFields[0];
var title = textField.Text;
if (!string.IsNullOrEmpty(title))
{
// Create a new album with the title entered.
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() =>
{
PHAssetCollectionChangeRequest.CreateAssetCollection(title);
}, (success, error) =>
{
if (!success)
{
Console.WriteLine($"error creating album: {error}");
}
});
}
}));
PresentViewController(alertController, true, null);
}
void SetupAlbum()
{
var album = PHAssetCollection.FetchAssetCollections(new[] { Xamarin.Essentials.Preferences.Get("iOSAlbumIdentifier", string.Empty).ToString() }, null)?.firstObject as PHAssetCollection;
if (album == null)
{
var albums = PHAssetCollection.FetchAssetCollections(PHAssetCollectionType.Album, PHAssetCollectionSubtype.Any, new PHFetchOptions
{
IncludeAssetSourceTypes = PHAssetSourceType.UserLibrary
});
if (albums.Count > 0)
{
foreach (var a in albums)
{
var collection = (a as PHAssetCollection);
if (collection.LocalizedTitle.Equals("ConferenceVision"))
{
SaveIdentifier(collection.LocalIdentifier);
return;
}
}
}
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() =>
{
var req = PHAssetCollectionChangeRequest.CreateAssetCollection("ConferenceVision");
albumIdentifier = req.PlaceholderForCreatedAssetCollection.LocalIdentifier;
SaveIdentifier(albumIdentifier);
}, (success, error) =>
{
Debug.Write("Create Album " + success);
});
}
}
partial void AddButtonClickHandler(NSObject sender)
{
// Prompt user from new album title.
var alertController = UIAlertController.Create("New Album", null, UIAlertControllerStyle.Alert);
alertController.AddTextField(textField => {
textField.Placeholder = "Album Name";
});
alertController.AddAction(UIAlertAction.Create("Cancel", UIAlertActionStyle.Cancel, null));
alertController.AddAction(UIAlertAction.Create("Create", UIAlertActionStyle.Default, action => {
UITextField textField = alertController.TextFields.First();
string title = textField.Text;
if (string.IsNullOrEmpty(title))
{
return;
}
// Create a new album with the title entered.
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() =>
PHAssetCollectionChangeRequest.CreateAssetCollection(title), (success, error) => {
if (!success)
{
Console.WriteLine(error.LocalizedDescription);
}
});
}));
PresentViewController(alertController, true, null);
}
public Task <IMediaAlbum> CreateAlbum(string title)
{
return(Task.Run(() =>
{
IMediaAlbum album = null;
string id = null;
if (PHPhotoLibrary.SharedPhotoLibrary.PerformChangesAndWait(() =>
{
var request = PHAssetCollectionChangeRequest.CreateAssetCollection(title);
id = request.PlaceholderForCreatedAssetCollection.LocalIdentifier;
}, out var error))
{
var col = (PHAssetCollection)PHAssetCollection.FetchAssetCollections(new[] { id }, null).First();
album = new MediaAlbum(col);
}
return album;
}));
}
public static Task <PHAssetCollection> CreateAlbum(string name)
{
var source = new TaskCompletionSource <PHAssetCollection>();
PHObjectPlaceholder placeholder = null;
PHPhotoLibrary.SharedPhotoLibrary.PerformChanges(() =>
{
var request = PHAssetCollectionChangeRequest.CreateAssetCollection(name);
placeholder = request.PlaceholderForCreatedAssetCollection;
}, (success, err) =>
{
if (success)
{
var result = PHAssetCollection.FetchAssetCollections(new[] { placeholder.LocalIdentifier }, null);
source.SetResult((PHAssetCollection)result.firstObject);
}
else
{
source.SetException(new Exception(err.ToString()));
}
});
return(source.Task);
}
public async Task <string> ImageSave(MemoryStream stream, bool compatibleMode, string fileName = null)
{
NSError error = null;
//虽然对于iOS没有这两个权限，但要保证方法异步，所以还是保留下来了
await Permissions.RequestAsync <Permissions.StorageWrite>();
await Permissions.RequestAsync <Permissions.StorageRead>();
//判断相册是否存在，不存在就创建
PHAssetCollection appAlbum = null;
PHFetchResult albums = PHAssetCollection.FetchAssetCollections(PHAssetCollectionType.Album, PHAssetCollectionSubtype.Any, null);
foreach (PHAssetCollection album in albums)
{
if (album.LocalizedTitle == albumName)
{
appAlbum = album;
}
}
if (appAlbum == null) //相册不存在，新建
{
string[] albumID = new string[1];
PHPhotoLibrary.SharedPhotoLibrary.PerformChangesAndWait(() =>
{
albumID[0] = PHAssetCollectionChangeRequest.CreateAssetCollection(albumName).PlaceholderForCreatedAssetCollection.LocalIdentifier;
}, out error);
appAlbum = PHAssetCollection.FetchAssetCollections(albumID, null)[0] as PHAssetCollection;
}
//获取路径及名称
string documentsPath;
documentsPath = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);
if (fileName == null || fileName == "")
{
fileName = "Tank_" + DateTime.Now.ToLocalTime().ToString("yyyyMMdd_HHmmss") + ".png";
}
string path = Path.Combine(documentsPath, fileName);
//保存
FileStream photoTankFile = new FileStream(path, FileMode.Create);
byte[] photoTank = stream.ToArray();
photoTankFile.Write(photoTank, 0, photoTank.Length);
photoTankFile.Flush();
photoTankFile.Close();
//如果是图片或视频，就添加到相册里
string MimeType = MimeUtility.GetMimeMapping(path);
if (MimeType.IndexOf("image") != -1 || MimeType.IndexOf("video") != -1)
{
string[] assetID = new string[1];
PHPhotoLibrary.SharedPhotoLibrary.PerformChangesAndWait(() =>
{
if (MimeType.IndexOf("image") != -1)
{
assetID[0] = PHAssetChangeRequest.FromImage(new NSUrl(path, true)).PlaceholderForCreatedAsset.LocalIdentifier;
}
if (MimeType.IndexOf("video") != -1)
{
assetID[0] = PHAssetChangeRequest.FromVideo(new NSUrl(path, true)).PlaceholderForCreatedAsset.LocalIdentifier;
}
}, out error);
PHAsset asset = PHAsset.FetchAssetsUsingLocalIdentifiers(assetID, null)[0] as PHAsset;
PHObject[] objs = { asset };
PHPhotoLibrary.SharedPhotoLibrary.PerformChangesAndWait(() =>
{
PHAssetCollectionChangeRequest collectionChangeRequest = PHAssetCollectionChangeRequest.ChangeRequest(appAlbum);
collectionChangeRequest.InsertAssets(objs, new NSIndexSet(0));
}, out error);
}
return(Path.Combine(fileName));
}