iOS 获取本地相册的所有图片

#import

#pragma mark - 获取本地所有图片
//url 装 image
- ( void )getImage:( NSString *)urlStr
{
    ALAssetsLibrary *assetLibrary=[[ ALAssetsLibrary alloc ] init ];
    NSURL *url=[ NSURL URLWithString :urlStr];
    [assetLibrary assetForURL :url resultBlock :^( ALAsset *asset)  {
       
        ALAssetRepresentation *rap = [asset defaultRepresentation ];
        CGImageRef ref = [rap fullScreenImage ];
        // 大图
        UIImage *image=[ UIImage imageWithCGImage :ref];
        // 缩略图
//        UIImage *image=[UIImage imageWithCGImage:asset.thumbnail];

        if ([asset valueForProperty : ALAssetTypePhoto ]) {
           
            dispatch_queue_t globalQueue = dispatch_get_global_queue ( DISPATCH_QUEUE_PRIORITY_DEFAULT , 0 );

            dispatch_async(globalQueue, ^{

               //将取得的image保存到数据源 用于后续赋值

                [ self . dataSource addObject :image];

            });
        }

       

// 刷新 

         dispatch_queue_t mainQueue = dispatch_get_main_queue ();
        dispatch_async (mainQueue, ^{
          [ self . collectionView reloadData ];

        });
       
    } failureBlock :^( NSError *error) {
        NSLog ( @"error=%@" ,error);
    }];
}

// 获取相册的所有图片
- ( void )reloadImagesFromLibrary
{
    NSMutableArray *images = [[ NSMutableArray alloc ] init ];
    dispatch_async ( dispatch_get_main_queue (), ^{
       
        @autoreleasepool {
            ALAssetsLibraryAccessFailureBlock failureblock = ^( NSError *myerror){
                NSLog ( @" 相册访问失败 =%@" , [myerror localizedDescription ]);
                if ([myerror. localizedDescription rangeOfString : @"Global denied access" ]. location != NSNotFound ) {
                    NSLog ( @" 无法访问相册 . 请在 ' 设置 -> 定位服务 ' 设置为打开状态 ." );
                } else {
                    NSLog ( @" 相册访问失败 ." );
                }
            };
           
            ALAssetsGroupEnumerationResultsBlock groupEnumerAtion = ^( ALAsset *result, NSUInteger index, BOOL *stop){
                if (result!= NULL ) {
                   
                    if ([[result valueForProperty : ALAssetPropertyType ] isEqualToString : ALAssetTypePhoto ]) {
                       
                        NSString *urlstr=[ NSString stringWithFormat : @"%@" ,result. defaultRepresentation . url ]; // 图片的 url

                        [imagesaddObject:urlstr];

            //有一张图片自动执行一次

                        [ self getImage :urlstr];
                      
                    }
                }
            };
           
            ALAssetsLibraryGroupsEnumerationResultsBlock libraryGroupsEnumeration = ^( ALAssetsGroup * group, BOOL * stop){
               
                if (group == nil )
                {
                   
                }
               
                if (group!= nil ) {
                    NSString *g=[ NSString stringWithFormat : @"%@" ,group]; // 获取相簿的组
                    NSLog ( @"gg:%@" ,g); //gg:ALAssetsGroup - Name:Camera Roll, Type:Saved Photos, Assets count:71
                   
                    NSString *g1=[g substringFromIndex : 16 ] ;
                    NSArray *arr=[[ NSArray alloc ] init ];
                    arr=[g1 componentsSeparatedByString : @"," ];
                    NSString *g2=[[arr objectAtIndex : 0 ] substringFromIndex : 5 ];
                    if ([g2 isEqualToString : @"Camera Roll" ]) {
                        g2= @" 相机胶卷 " ;
                    }
                    //                    NSString *groupName=g2;// 组的 name
                   
                    [group enumerateAssetsUsingBlock :groupEnumerAtion];
                }
               
            };
           
            ALAssetsLibrary * library = [[ ALAssetsLibrary alloc ] init ];
            [library enumerateGroupsWithTypes : ALAssetsGroupAll
                                   usingBlock :libraryGroupsEnumeration
                                 failureBlock :failureblock];
        }
       
    });

}