- (void)saveToAlbumWithMetadata:(NSDictionary*)metadataimageData:(NSData*)imageDatacustomAlbumName:(NSString*)customAlbumNamecompletionBlock:(void(^)(void))completionBlockfailureBlock:(void(^)(NSError*error))failureBlock
{ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];    //接下来是疯狂的 blockvoid(^AddAsset)(ALAssetsLibrary *, NSURL*) = ^(ALAssetsLibrary *assetsLibrary, NSURL*assetURL) {//1 遍历 AssetsLibrary 整个相册库[assetsLibrary assetForURL:assetURL resultBlock:^(ALAsset *asset) {　　　　　　　//2 遍历 ALAssetsGroup 相册库中文件夹[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL*stop) {                //3 找到 customAlbumName 对应的相册库文件夹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);}}];};

    //把照片写入相册[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();}}}];}- (void)saveImage:(UIImage*)image{ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];NSMutableArray*groups=[[NSMutableArrayalloc]init];ALAssetsLibraryGroupsEnumerationResultsBlock listGroupBlock = ^(ALAssetsGroup *group, BOOL*stop){if(group){[groups addObject:group];}else{BOOLhaveHDRGroup = NO;for(ALAssetsGroup *gp in groups){NSString*name =[gp valueForProperty:ALAssetsGroupPropertyName];if([name isEqualToString:@"Flickr墙纸"]){haveHDRGroup = YES;}}if(!haveHDRGroup){//do add a group named "HDR"[assetsLibrary addAssetsGroupAlbumWithName:@"Flickr墙纸"resultBlock:^(ALAssetsGroup *group){[groups addObject:group];}failureBlock:nil];haveHDRGroup = YES;}}};//创建相簿
    [assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAlbum usingBlock:listGroupBlock failureBlock:nil];

//在我的"扫一扫"代码中，生成的二维码图片存到新创建的相薄后显示全黑，后同事指点原来是下边红色方法的问题，后换了个方法实现了：
UIImageJPEGRepresentation(image,1)[self saveToAlbumWithMetadata:nilimageData:UIImagePNGRepresentation(image) customAlbumName:@"Flickr墙纸"completionBlock:^{UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"保存成功"message:@"若想马上启用该墙纸，请进入图库找到该墙纸并设置为墙纸即可，感谢您的使用。"delegate:nilcancelButtonTitle:@"好"otherButtonTitles: nil];[alert show];} failureBlock:^(NSError*error){UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"保存失败"message:error.description delegate:nilcancelButtonTitle:@"知道了"otherButtonTitles: nil];[alert show];//面这个方法可判断是否是因为用户拒绝访问地址所致，如果是中文环境返回 的是“用户拒绝访问”
if (([myerror.localizedDescription rangeOfString:@"User denied access"].location!=NSNotFound ）|| （[myerror.localizedDescription rangeOfString:@"用户拒绝访问"].location!=NSNotFound）)}];}