IOS開發—自訂多選相簿

IOS開發—自訂多選相簿
自訂多選相簿主要思路匯入AssetsLibrary架構 從資產庫中擷取擷取資源群組【0】，過濾【1】照片後在列表中顯示組。 點擊資源群組進入對應的相簿中，擷取組中的所有照片資源【2】

【0】擷取資源群組[_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:@相簿擷取失敗 delegate:self cancelButtonTitle:@取消 otherButtonTitles: nil];        [alert show];    }];

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

【2】擷取照片資源- (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];        }    }];}

相關操作

擷取資源群組名

[_assetsGroup valueForProperty:ALAssetsGroupPropertyName];

擷取資源群組的海報縮圖

[UIImage imageWithCGImage:_assetsGroup.posterImage];

擷取照片資源的正方形縮圖

[UIImage imageWithCGImage:_asset.thumbnail];

擷取照片資源完全解析度的映像(先封裝映像資源)

[[asset defaultRepresentation] fullResolutionImage]];

擷取資源類型

[asset valueForProperty:ALAssetPropertyType];