Assetslibrary implement access to albums, select multiple photos display

1 #import "ViewController.h"2 #import<AssetsLibrary/AssetsLibrary.h>3 4 5 /**6 * ALAssetsLibrary.h representative Resource library (all videos, photos)7 ALAssetsGroup.h represents albums in the resource pool8 ALAsset.h represents a video or a photo in a photo album9 ALAssetRepresentation.h represents a description of a resource that can be obtained to the original pictureTen  */ One  A @interfaceViewcontroller () -  -@property (Weak, nonatomic) Iboutlet Uicollectionview *CollectionView; the  -@property (nonatomic,strong) Nsmutablearray *Array; - @end -  + @implementationviewcontroller{ -  +Alassetslibrary *Library; A  at } -  -- (void) Viewdidload { - [Super Viewdidload]; -      -     //creating variable arrays, storing resource files in_array =[Nsmutablearray array]; -      to     //Create a resource library for access to album Resources +Library =[[Alassetslibrary alloc] init]; -      the     //Traverse all the albums in the Repository, how many albums are there, how many times Usingblock will be called *[Library Enumerategroupswithtypes:alassetsgroupsavedphotos usingblock:^ (alassetsgroup *group, BOOL *stop) { $         Panax Notoginseng         //If there is an album, then Traverse -         if(group) { the              +             //Traverse all the resources in the album (Photos, Videos) A[Group enumerateassetsusingblock:^ (Alasset *result, Nsuinteger index, BOOL *stop) { the                 +                /* - index of the resource $ if (index = = 2) { $                     - //Stop traversal - *stop = YES; the                } -                 */Wuyi                 the                if(Result) { -                    //storing a resource in an array Wu [_array Addobject:result]; -                } About                 $            }]; -         } -          -         //refresh _collectionview reloaddata; A [_collectionview Reloaddata]; +          the} failureblock:^ (Nserror *error) { -          $NSLog (@"Access failed"); the     }]; the      the } the  - #pragmaMark-uicollectionviewdelegate in  the //Number of rows the-(Nsinteger) CollectionView: (Uicollectionview *) CollectionView numberofitemsinsection: (nsinteger) Section { About  the  the     return_array.count; the  + } -  the //Create UicollectionviewcellBayi-(Uicollectionviewcell *) CollectionView: (Uicollectionview *) CollectionView Cellforitematindexpath: (NSIndexPath *) Indexpath { the      the     //if the cell is drawn in the storyboard and does not need to be registered, you need to specify an identifier in the cell -Uicollectionviewcell *cell = [CollectionView dequeuereusablecellwithreuseidentifier:@"Cell"Forindexpath:indexpath]; -      the     //Get Picture View theUiimageview *imgview = (Uiimageview *) [Cell.contentview Viewwithtag:1]; the      the     //Take out the corresponding resource data -Alasset *result =_array[indexpath.row]; the      the     //get to thumbnail image theCgimageref cimg =[result thumbnail];94      the     //Convert to UIImage theUIImage *img =[UIImage imagewithcgimage:cimg]; the 98     //Show Pictures AboutImgview.image =img; -     101     /**102 * Get to original picture103 alassetrepresentation *presentation = [result defaultrepresentation];104      the cgimageref resolutionimg = [presentation fullresolutionimage];106      */107 108     returncell;109  the }111  the //Cell Size113-(Cgsize) CollectionView: (Uicollectionview *) CollectionView layout: (uicollectionviewlayout *) collectionviewlayout Sizeforitematindexpath: (Nsindexpath *) indexpath{ the  the     returnCgsizemake ( -, -); the 117}

Assetslibrary implement access to albums, select multiple photos display