一、获取相册中所有图片，并按时间排序
PHFetchOptions *allOptions = [[PHFetchOptions alloc]init];
allOptions.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:YES]];
PHFetchResult *allPhotos = [PHAsset fetchAssetsWithOptions:allOptions];
二、获取所有相册
1.系统相册
PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
2.个人相册
PHFetchResult *customAlbum = [PHCollectionList fetchTopLevelUserCollectionsWithOptions:nil];
3.打印每个相册的名称及照片数量，以个人相册举例
PHFetchResult *customAlbum = [PHCollectionList fetchTopLevelUserCollectionsWithOptions:nil];
for (PHAssetCollection *collection in smartAlbums) {
PHFetchResult *result = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
NSLog(@"%@(%ld)", collection.localizedTitle, result.count);
}
三、图片的展示
获取相册的第一张图片
PHAsset *singleAsset = result.lastObject;
把PHAsset转化成我们需要的图片
[[PHImageManager defaultManager] requestImageForAsset:singleAsset targetSize:CGSizeZero contentMode:PHImageContentModeAspectFill options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
imageView.image = result;
}];
