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在ios8以下的系统创建新相册，然后在相册中手动删除了这个"琳小兮"相册，再使用下面的代码重新创建"琳小兮"相册是没有问题的：
[assetsLibrary addAssetsGroupAlbumWithName:@"琳小兮"
resultBlock:^(ALAssetsGroup *group)
{
[groups addObject:group];
}
failureBlock:nil];
ios8+ 包含ios8系统，在创建的时候用上面的代码则会崩溃，需要额外添加Photos.framework框架，并导入头文件#import <Photos/Photos.h>，主要修改的代码部分是把上面那段代码做如下修改：
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^
{
[PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"琳小兮"];
} completionHandler:^(BOOL success, NSError *error)
{
if (!success) {
NSLog(@"---error:%@",error.userInfo);
}
}];
下面是完整的demo，结合了网上的实例写的，给大家做一个参考：
1.添加AssetsLibrary.framework 和 Photos.framework框架
2.导入头文件
#import <AssetsLibrary/AssetsLibrary.h>
#import <Photos/Photos.h>
3.创建全局 UIImageView *_imageV;
- (void)viewDidLoad
{
[super viewDidLoad];
_imageV = [[UIImageView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
_imageV.image = [UIImage imageNamed:@"name.png"];
[self.view addSubview:_imageV];
[self createAlbumInPhoneAlbum];
}
#pragma mark - 在手机相册中创建相册
- (void)createAlbumInPhoneAlbum
{
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
NSMutableArray *groups=[[NSMutableArray alloc]init];
ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL *stop)
{
if (group)
{
[groups addObject:group];
}
else
{
BOOL haveHDRGroup = NO;
for (ALAssetsGroup *gp in groups)
{
NSString *name =[gp valueForProperty:ALAssetsGroupPropertyName];
if ([name isEqualToString:@"琳小兮"])
{
haveHDRGroup = YES;
}
}
if (!haveHDRGroup)
{
//添加一个新的相册
//此方法在ios8.0系统上，之前用代码创建的相册，手动删除它，再用这个库去创建刚被删除的相册，这个时候方法回调是不会跑fail模块的，它走的是正常流程，但是带回来的group却是nil
// [assetsLibrary addAssetsGroupAlbumWithName:@"琳小兮"
// resultBlock:^(ALAssetsGroup *group)
// {
// NSLog(@"--------%@",group);
// [groups addObject:group];
// }
// failureBlock:nil];
//为了解决iOS8.0以上系统下无法通过代码创建被删除过的同名相册
[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^
{
[PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"琳小兮"];
} completionHandler:^(BOOL success, NSError *error)
{
if (!success) {
NSLog(@"---error:%@",error.userInfo);
}
}];
haveHDRGroup = YES;
}
}
};
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:listGroupBlock failureBlock:nil];
[self saveToAlbumWithMetadata:nil imageData:UIImagePNGRepresentation(_imageV.image) customAlbumName:@"北企星" completionBlock:^
{
//这里可以创建添加成功的方法
NSLog(@"-------新相册创建成功！！");
}
failureBlock:^(NSError *error)
{
//处理添加失败的方法显示alert让它回到主线程执行，不然那个框框死活不肯弹出来
dispatch_async(dispatch_get_main_queue(), ^{
//添加失败一般是由用户不允许应用访问相册造成的，这边可以取出这种情况加以判断一下
if([error.localizedDescription rangeOfString:@"User denied access"].location != NSNotFound ||[error.localizedDescription rangeOfString:@"用户拒绝访问"].location!=NSNotFound){
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:error.localizedDescription message:error.localizedFailureReason delegate:nil cancelButtonTitle:NSLocalizedString(@"ok", nil) otherButtonTitles: nil];
[alert show];
}
});
}];
}
- (void)saveToAlbumWithMetadata:(NSDictionary *)metadata
imageData:(NSData *)imageData
customAlbumName:(NSString *)customAlbumName
completionBlock:(void (^)(void))completionBlock
failureBlock:(void (^)(NSError *error))failureBlock
{
ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
void (^AddAsset)(ALAssetsLibrary *, NSURL *) = ^(ALAssetsLibrary *assetsLibrary, NSURL *assetURL) {
[assetsLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:customAlbumName]) {
[group addAsset:asset];
if (completionBlock) {
completionBlock();
}
}
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
};
[assetsLibrary writeImageDataToSavedPhotosAlbum:imageData metadata:metadata completionBlock:^(NSURL *assetURL, NSError *error) {
if (customAlbumName) {
[assetsLibrary addAssetsGroupAlbumWithName:customAlbumName resultBlock:^(ALAssetsGroup *group) {
if (group) {
[assetsLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {
[group addAsset:asset];
if (completionBlock) {
completionBlock();
}
} failureBlock:^(NSError *error) {
if (failureBlock) {
failureBlock(error);
}
}];
} else {
AddAsset(assetsLibrary, assetURL);
}
} failureBlock:^(NSError *error) {
AddAsset(assetsLibrary, assetURL);
}];
} else {
if (completionBlock) {
completionBlock();
}
}
}];
}
ios8使用ALAssetsLibrar创建单独文件夹方法以及删除文件夹闪退的bug
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原文地址：http://my.oschina.net/linxiaoxi1993/blog/500268
