- (void)saveToAlbumWithMetadata:(NSDictionary*)metadata
                      imageData:(NSData*)imageData
                customAlbumName:(NSString*)customAlbumName
                completionBlock:(void(^)(void))completionBlock
                   failureBlock:(void(^)(NSError*error))failureBlock
{
    ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
    //接下来是疯狂的 block
    void(^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）)
    }];
 
}