Assetslibrary to support multiple graphics selection in iOS

The Assetslibrary framework provides a alassetslibrary class to help us access photos and videos under the management of photo albums, as shown in official documents.

if (!self.assetslibrary) {
_assetslibrary = [[Alassetslibrary alloc] init];
}

With this framework, we can get a list of albums:
[_assetslibrary enumerategroupswithtypes:alassetsgroupall usingblock:^ (alassetsgroup *group, BOOL *stop) {
if (group) {
[Self.grouparray Addobject:group];
}
} failureblock:^ (Nserror *error) {
NSLog (@ "Group not found!n");
}];

By clicking on each album, we can access the list of photos in the album:
#pragma mark-

-(void) getimages
{
if (!self.assetsarray) {
_assetsarray = [[Nsmutablearray alloc] init];
}

if (!self.assetslibrary) {
_assetslibrary = [[Alassetslibrary alloc] init];
}

@autoreleasepool {
[Self.assetsgroup enumerateassetsusingblock:^ (Alasset *result, Nsuinteger index, BOOL *stop) {
if (result) {
Ttasset *ttasset = [[Ttasset alloc] initwithasset:result];
[Self.assetsarray Addobject:ttasset];
[Ttasset release], ttasset = nil;
}
}];
}

[Self.tableview Reloaddata];
}

Finally, we can customize the display style of the cell, such as the selection effect, bottom check list, and so on.