我想创建一个自定义库，我将获取所有带有文件夹名称的视频。我实现了一些代码，但这不能正常工作。我的代码从某些文件夹中获取视频，但也删除了一些文件夹我想要获取所有文件夹。
这是我的代码： -
-(void)getAllVideos
{
assetItems = [NSMutableArray arrayWithCapacity:0];
allVideos = [[NSMutableArray alloc] init];
ALAssetsLibrary *assetLibrary = [[ALAssetsLibrary alloc] init];
[assetLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop)
{
if (group)
{
NSString * str = [NSString stringWithFormat:@"%@",group];
int power = [str rangeOfString:@","].location;
NSString *str1= [str substringToIndex:power];
int dash = [str rangeOfString:@":"].location;
NSString *final = [str1 substringFromIndex:dash+1];
combineArray =[[NSMutableArray alloc]init];
thumbnailImages = [[NSMutableArray alloc]init];
videosURL = [[NSMutableArray alloc]init];
NSLog(@"name of folder%@",group);
[groupName addObject:final];
[group setAssetsFilter:[ALAssetsFilter allVideos]];
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop)
{
if (asset)
{
dic = [[NSMutableDictionary alloc] init];
ALAssetRepresentation *defaultRepresentation = [asset defaultRepresentation];
NSString *uti = [defaultRepresentation UTI];
NSURL *videoURL = [[asset valueForProperty:ALAssetPropertyURLs] valueForKey:uti];
NSString *title = [NSString stringWithFormat:@"video %d", arc4random()%100];
AVAsset *asset = [AVAsset assetWithURL:videoURL];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time = [asset duration];
time.value = 0;
CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);
[thumbnailImages addObject:thumbnail];
[videosURL addObject:videoURL];
}
} ];
if(thumbnailImages.count >0)
[combineArray addObject:thumbnailImages];
if(videosURL.count > 0)
[combineArray addObject:videosURL];
if(combineArray.count>0)
[alldata setObject:combineArray forKey:final];
}
// group == nil signals we are done iterating.
else
{
dispatch_async(dispatch_get_main_queue(), ^{
});
}
}
failureBlock:^(NSError *error)
{
NSLog(@"error enumerating AssetLibrary groups %@\n", error);
}];
}
请告诉我必须做哪些更改？