IOS开发—自定义多选相册

自定义多选相册

主要思路

1. 导入AssetsLibrary框架
2. 从资源库中获取获取资源组【0】，过滤【1】照片后在列表中显示组。
3. 点击资源组进入对应的相册中，获取组中的所有照片资源【2】

【0】获取资源组
[_assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
        if (group) {
            [_assetsArray addObject:group];
            [_tableView reloadData];
        }
    } failureBlock:^(NSError *error) {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"相册获取失败" delegate:self cancelButtonTitle:@"取消" otherButtonTitles: nil];
        [alert show];
    }];

【1】过滤
[_assetsGroup setAssetsFilter:[ALAssetsFilter allPhotos]];

【2】获取照片资源
- (void)getImages{
    _thumbnailMeasure = (SCREEN_WIDTH-(self.numberOfImageEachRow+1)*PHOTO_DEFAULT_MARGIN)/self.numberOfImageEachRow;
    CGRect frame = CGRectMake(0, 0, _thumbnailMeasure, _thumbnailMeasure);
    [self.assetsGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
        if (result) {
            AssetView *assetView = [[AssetView alloc]initWithAsset:result WithFrame:frame];
            assetView.delegate = self;
            [_assetsArray addObject:assetView];
        }
    }];
}

相关操作

1. 获取资源组名

   [_assetsGroup valueForProperty:ALAssetsGroupPropertyName];

2. 获取资源组的海报缩略图
   

   [UIImage imageWithCGImage:_assetsGroup.posterImage];

3. 获取照片资源的正方形缩略图
   

   [UIImage imageWithCGImage:_asset.thumbnail];

4. 获取照片资源完全分辨率的图像(先封装图像资源)
   

   [[asset defaultRepresentation] fullResolutionImage]];

5. 获取资源类型
   

   [asset valueForProperty:ALAssetPropertyType];

Demo代码已上传github

https://github.com/Lotheve/LXXMutiAlbum

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