ios 相册 同时选择多张图片

源码:https://github.com/iOSSinger/SGImagePickerController

 

需要导入这个头文件

#import <AssetsLibrary/AssetsLibrary.h>

1.获取相册分组

- (NSMutableArray *)groups{
    if (_groups == nil) {
        _groups = [NSMutableArray array];
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
                if(group){
                    [_groups addObject:group];
                    [self.tableView reloadData];
                }
            } failureBlock:^(NSError *error) {
                UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"访问相册失败" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil];
                [alertView show];
            }];
        });
    }
    return _groups;
}

2.　遍历一组中的资源,包括图片视频等,我们只需要图片

- (void)setGroup:(ALAssetsGroup *)group{
    _group = group;
    [group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop) {
        if (asset == nil) return ;
        if (![[asset valueForProperty:ALAssetPropertyType] isEqualToString:ALAssetTypePhoto]) {//不是图片
            return;
        }
        SGAssetModel *model = [[SGAssetModel alloc] init];
        model.thumbnail = [UIImage imageWithCGImage:asset.thumbnail];
        model.imageURL = asset.defaultRepresentation.url;
        [self.assetModels addObject:model];
    }];
}

3.遍历可以拿到图片缩略图,原图的URL 图片拍摄地点 拍摄时间等信息,我们只需要缩略图用来展示,原图URL用来获取原图

根据URL获取原图,系统应该是在子线程中的获取原图,注意此处!!! 

- (void)originalImage:(void (^)(UIImage *))returnImage{
    ALAssetsLibrary *lib = [[ALAssetsLibrary alloc] init];
    [lib assetForURL:self.imageURL resultBlock:^(ALAsset *asset) {
        ALAssetRepresentation *rep = asset.defaultRepresentation;
        CGImageRef imageRef = rep.fullResolutionImage;
        UIImage *image = [UIImage imageWithCGImage:imageRef scale:rep.scale orientation:(UIImageOrientation)rep.orientation];
        if (image) {
            returnImage(image);
        }
    } failureBlock:^(NSError *error) {
        
    }];
}

其他代码就是处理这些数据,模型,展示效果等,详细代码见github,欢迎指正　　

源码:https://github.com/iOSSinger/SGImagePickerController