Photo Demo for multi-select albums

Photo Demo for multi-select albums

1. Prepare 3 Photos First

#import <UIKit/UIKit.h>

typedef void (^selectbtnclickblock) (BOOL isselect);

@interface Phocollectionviewcell:uicollectionviewcell

@PRoperty (Weak, nonatomic) iboutlet Uiimageview * ImageView;

@property (Weak, nonatomic) iboutlet Uiimageview * Selectimageview;

@property (nonatomic,copy) Selectbtnclickblock Selectbtnclickblock;

-(Ibaction) Selectbtnclick: (ID) sender; @property (Weak, nonatomic) Iboutlet UIButton *selectbtn;

@end

#import "PhoCollectionViewCell.h" @implementation phocollectionviewcell-(void) awakefromnib {    //initialization Code    }-(ibaction) Selectbtnclick: (ID) Sender {    UIButton *btn= (UIButton *) sender;     btn.selected=!btn.selected;    NSLog (@ "%@", @ "AAAA");      _selectbtnclickblock (btn.selected);} @end

3. Create a photo model

#import <Foundation/Foundation.h> #import <AssetsLibrary/ALAssetsLibrary.h> @interface Phomodel: Nsobject@property (Nonatomic,strong) Alasset *asset; @property (nonatomic,assign) BOOL isSelected; @end

#import "PhoModel.h" @implementation phomodel@end

4. Get album picture Display picture

#import "ViewController.h" #import <AssetsLibrary/AssetsLibrary.h> #import "AppDelegate.h" #import "PhoModel.h" #import "PhoCollectionViewCell.h" #define APPLICATIONDELEGATE ((appdelegate *) [uiapplication sharedapplication]. Delegate) static Nsinteger count = 0; @interface Viewcontroller () {Nsmutablearray *mutableassets;} @property (Weak, nonatomic) Iboutlet Uicollectionview *collectionview; @end @implementation viewcontroller-(void)        viewdidload {[Super viewdidload];    Get all the photos in the album [Self Getallpictures]; [_collectionview registernib: [uinib nibwithnibname:@ "Phocollectionviewcell" Bundle:nil] ForCellWithReuseIdentifier : @ "Collectionviewcell"];}        Get all photos in album-(void) getallpictures {mutableassets = [[Nsmutablearray alloc]init];    Nsmutablearray *asseturldictionaries = [[Nsmutablearray alloc] init];        Nsmutablearray *assetgroups = [[Nsmutablearray alloc] init];    __block Nsmutablearray *tempmutableassets = mutableassets; __block Viewcontroller *tempself = self;   __block Nsmutablearray *tempassetgroups = assetgroups; [Applicationdelegate.library enumerategroupswithtypes:alassetsgroupsavedphotos usingBlock:^ (ALAssetsGroup *group,            BOOL *stop) {if (group! = nil) {count = [group numberofassets];            __block int groupnum = 0; [Group enumerateassetsusingblock:^ (Alasset *asset, Nsuinteger index, BOOL *stop)                    {if (Asset! = Nil) {+ + groupnum; if ([[[Asset Valueforproperty:alassetpropertytype] Isequaltostring:alassettypephoto]) {[asseturldict                        Ionaries Addobject:[asset Valueforproperty:alassetpropertyurls]];                        Nsurl *url= (nsurl*) [[Asset Defaultrepresentation]url];                        NSLog (@ "%@,%@", [Asset valueforproperty:alassetpropertydate],url);                        [UIImage imagewithcgimage:[[result defaultrepresentation] fullscreenimage]];//picture// [UIImage imAgewithcgimage:[result thumbnail]];                        Thumbnail Phomodel *phomodel=[[phomodel alloc]init];                        Phomodel.asset=asset;                        Phomodel.isselected=no;                        [Tempmutableassets Addobject:phomodel];                        if (Tempmutableassets.count = = groupnum) {[Tempself allphotoscollected:tempmutableassets];            }                    }                }            }];        [Tempassetgroups Addobject:group];    }}failureblock:^ (Nserror *error) {NSLog (@ "There is an error"); }];} All asset-(void) allphotoscollected: (Nsmutablearray *) mutableasset{[Self.collectionview reloaddata];} #pragma mark-uicollectionviewdatasource-(cgsize) CollectionView: (Uicollectionview *) CollectionView layout: ( uicollectionviewlayout*) collectionviewlayout Sizeforitematindexpath: (Nsindexpath *) IndexPath {CGSize itemSize = Cgsizemake ([UIScreen MainSCREEN].BOUNDS.SIZE.WIDTH-15)/4.0, ([UIScreen mainscreen].bounds.size.width-30)/4.0); return itemsize;} Define the number of Uicollectionviewcell displayed-(Nsinteger) CollectionView: (Uicollectionview *) CollectionView Numberofitemsinsection: (Nsinteger) section{return mutableassets.count+1;} Content displayed for each Uicollectionview-(Uicollectionviewcell *) CollectionView: (Uicollectionview *) CollectionView    Cellforitematindexpath: (Nsindexpath *) indexpath{static NSString * Cellidentifier = @ "Collectionviewcell"; Phocollectionviewcell * cell = [CollectionView dequeuereusablecellwithreuseidentifier:cellidentifier forIndexPath:    Indexpath];        if (indexpath.row==0) {cell.imageView.image = [UIImage imagenamed:@ "0.png"];        Cell.selectimageview.hidden=yes;        cell.selectbtnclickblock=^ (BOOL isselect) {NSLog (@ "cell1 block");        };    return cell;        } Phomodel *phomodel = Mutableassets[indexpath.row-1]; Cell.imageView.image = [UIImage imagewithcgimage:[phomodel.assET thumbnail]];    if (phomodel.isselected) {cell.selectimageview.image=[uiimage imagenamed:@ "2.png"];    } else {cell.selectimageview.image=[uiimage imagenamed:@ "1.png"];    } Cell.selectimageview.hidden=no;    cell.selectbtn.selected=phomodel.isselected;        cell.selectbtnclickblock=^ (BOOL isselect) {///Radio multiple selection flag false single True multi-select BOOL issangal=false;            if (Issangal) {for (Phomodel *tmpphotomodel in mutableassets) {tmpphotomodel.isselected = NO;        }} Phomodel.isselected=isselect;    [_collectionview Reloaddata];        }; return cell;} -(void) CollectionView: (Uicollectionview *) CollectionView Didselectitematindexpath: (Nsindexpath *) IndexPath {NSLog ( @ "%ld", Indexpath.row);}    -(void) didreceivememorywarning {[Super didreceivememorywarning]; Dispose of any resources the can be recreated.} @end

5. Effects

Photo Demo for multi-select albums