ImageSelect to allow multiple selection in photo library via collection view interface.

Hi,
As I know , many people needs something that allow multiple  selection on iPhone Photo Library.
On lot of searching over net , I found some API that allow multiple selection on iPhone Photo Library.

But there were some disadvantages including memory warning , hanging problem etc. So to overcome this situation I introduced you a set of two files that will let you select multiple image at a time from Library.

How to Use Selector Files:-

1)First of all you need to add AssetsLibrary framework in your project.

2)Import ImageSelector.h file where ever you want to use it. And you need one more file that is check image.

  Add this image to your project and name it as check.png


3)Add its delegate as

@interface ViewController : UIViewController<ImageSelectorDelegate>
- (IBAction)select:(id)sender;
@end

 And use its delegate method in implementation file like UITableView.

4)Create object of ImageSelector File and set its delegate to self view-controller and present ImageSelector Object as modal view as given below:

    ImageSelector *selector = [[ImageSelector alloc] init];
    selector.ims_delegate = self;
    [self presentViewController:selector animated:YES completion:nil];

5)In its delegate method you will get selected Images from photo Library

-(void)ims_PickerController:(ImageSelector*)picker didFinishPickingMediaItems:(NSArray*)items
{
    [picker dismissViewControllerAnimated:YES completion:nil];

    for (UIImage *image in items) {
        NSLog(@"My Image %@\n",image);
    }
}

For File Ref ----------

ImageSelector.h

	//
	// ImageSelector.m
	// PG
	//
	// Created by Prince Kumar on 8/8/14.
	// Copyright (c) 2014 Prince Kumar. All rights reserved.
	//
	#import <UIKit/UIKit.h>
	@class ImageSelector;
	@protocol ImageSelectorDelegate <NSObject>
	-(void)ims_PickerController:(ImageSelector*)picker didFinishPickingMediaItems:(NSArray*)items;
	@end
	@interface ImageSelector : UIViewController<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout,UICollectionViewDelegate>
	{
	UICollectionView *_collectionView;
	id <ImageSelectorDelegate> ims_delegate;
	}
	@property(nonatomic,strong)id <ImageSelectorDelegate>ims_delegate;
	@end

view raw ImageSelector.h hosted with ❤ by GitHub

ImageSelector.m

	//
	// ImageSelector.m
	// PG
	//
	// Created by Prince Kumar on 8/8/14.
	// Copyright (c) 2014 Prince Kumar. All rights reserved.
	//
	#import "ImageSelector.h"
	#import <AssetsLibrary/AssetsLibrary.h>
	@interface ImageSelector ()
	{
	__block NSMutableArray *thumbsArr;
	__block NSMutableArray *urlArray;
	NSMutableArray *selectedIndexArr;
	}
	@end
	@implementation ImageSelector
	@synthesize ims_delegate;
	-(id)init{
	self = [super init];
	if (self) {
	thumbsArr = [[NSMutableArray alloc] init];
	urlArray = [[NSMutableArray alloc] init];
	selectedIndexArr = [[NSMutableArray alloc] init];
	}
	return self;
	}
	- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
	{
	self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
	if (self) {
	// Custom initialization
	}
	return self;
	}
	-(void)loadAssets{
	__block NSDate *now = [NSDate date];
	__block NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
	dateFormatter.dateFormat = @"hh:mm:ss";
	[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
	NSLog(@"Start: %@",[dateFormatter stringFromDate:now]);
	__block ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
	[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
	[group setAssetsFilter:[ALAssetsFilter allPhotos]];
	[group enumerateAssetsWithOptions:NSEnumerationReverse usingBlock:^(ALAsset *alAsset, NSUInteger index, BOOL *innerStop) {
	if (alAsset) {
	ALAssetRepresentation *representation = [alAsset defaultRepresentation];
	UIImage *latestPhotoThumbnail = [UIImage imageWithCGImage:[alAsset thumbnail]];
	[urlArray addObject:representation.url];
	[thumbsArr addObject:latestPhotoThumbnail];
	representation = nil;
	latestPhotoThumbnail = nil;
	}else{
	now = [NSDate date];
	NSLog(@"End: %@",[dateFormatter stringFromDate:now]);
	now = nil;
	library = nil;
	dateFormatter = nil;
	[_collectionView reloadData];
	}
	}];
	} failureBlock: ^(NSError *error) {
	NSLog(@"No groups: %@",error);
	}];
	}
	- (void)viewDidLoad
	{
	self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
	CGRect controllerFrame = self.view.frame;
	controllerFrame.origin.y = 44;
	controllerFrame.size.height-=44;
	UIToolbar *controllerBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0,0, controllerFrame.size.width, 44)];
	controllerBar.tintColor = [UIColor colorWithRed:255.0/255.0 green:102.0/255.0 blue:51.0/255.0 alpha:0.9];
	controllerBar.barStyle = UIBarStyleBlackTranslucent;
	UIBarButtonItem *cancel = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStyleBordered target:self action:@selector(cancel)];
	UIBarButtonItem *flexibleItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
	UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@selector(done)];
	[cancel setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIColor whiteColor], NSForegroundColorAttributeName,nil] forState:UIControlStateNormal];
	[done setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys: [UIColor whiteColor], NSForegroundColorAttributeName,nil] forState:UIControlStateNormal];
	[controllerBar setItems:@[cancel,flexibleItem,done] animated:YES];
	UICollectionViewFlowLayout *layout=[[UICollectionViewFlowLayout alloc] init];
	_collectionView=[[UICollectionView alloc] initWithFrame:controllerFrame collectionViewLayout:layout];
	_collectionView.allowsMultipleSelection = YES;
	[_collectionView setDataSource:self];
	[_collectionView setDelegate:self];
	[_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"im_cell_identifier"];
	[_collectionView setBackgroundColor:[UIColor whiteColor]];
	[self.view addSubview:controllerBar];
	[self.view addSubview:_collectionView];
	[super viewDidLoad];
	// Do any additional setup after loading the view.
	}
	-(void)viewDidAppear:(BOOL)animated
	{
	[self loadAssets];
	}
	- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
	{
	return [thumbsArr count];
	}
	// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
	- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
	{
	UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:@"im_cell_identifier" forIndexPath:indexPath];
	UIImageView *imgView = (UIImageView*)[cell viewWithTag:21];
	UIImageView *checked = (UIImageView*)[cell viewWithTag:44];
	if (imgView==nil) {
	imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 65, 65)];
	imgView.tag =21;
	imgView.center = CGPointMake(cell.frame.size.width/2, cell.frame.size.height/2);
	cell.backgroundColor = [UIColor whiteColor];
	[cell addSubview:imgView];
	}
	if (checked==nil) {
	checked = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
	checked.tag = 44;
	checked.center = CGPointMake(cell.frame.size.width/2, cell.frame.size.height/2);
	[cell addSubview:checked];
	}
	if (cell.selected) {
	[checked setImage:[UIImage imageNamed:@"check.png"]];
	[cell setBackgroundColor:[UIColor redColor]];
	}else{
	[checked setImage:nil];
	[cell setBackgroundColor:[UIColor whiteColor]];
	}
	[imgView setImage:[thumbsArr objectAtIndex:indexPath.row]];
	return cell;
	}
	- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
	{
	return CGSizeMake(70, 70);
	}
	- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
	{
	return 5;
	}
	- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
	{
	return 2.5;
	}
	- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout referenceSizeForHeaderInSection:(NSInteger)section
	{
	return CGSizeMake(320, 10);
	}
	- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
	{
	return UIEdgeInsetsMake(10, 10, 10, 10);
	}
	#pragma mark - Collection view delegate
	- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
	{
	if ([selectedIndexArr count]==10) {
	UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Limit Exceed" message:@"You cannot select more than 10 images." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
	[alert show];
	return;
	}
	UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
	cell.backgroundColor = [UIColor redColor];
	UIImageView *checked = (UIImageView*)[cell viewWithTag:44];
	[checked setImage:[UIImage imageNamed:@"check.png"]];
	NSURL *url = [urlArray objectAtIndex:indexPath.row];
	[selectedIndexArr addObject:url];
	url = nil;
	checked = nil;
	cell = nil;
	}
	- (void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
	{
	UICollectionViewCell *cell = [collectionView cellForItemAtIndexPath:indexPath];
	cell.backgroundColor = [UIColor whiteColor];
	UIImageView *checked = (UIImageView*)[cell viewWithTag:44];
	[checked setImage:nil];
	NSURL *url = [urlArray objectAtIndex:indexPath.row];
	[selectedIndexArr removeObject:url];
	cell = nil;
	checked = nil;
	url = nil;
	}
	#pragma mark - BarButton Methods
	-(void)cancel
	{
	[self dismissViewControllerAnimated:YES completion:nil];
	}
	-(void)done
	{
	__block NSMutableArray *imageArray = [[NSMutableArray alloc] initWithCapacity:[selectedIndexArr count]];
	[selectedIndexArr enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
	ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
	[library assetForURL:obj resultBlock:^(ALAsset *asset) {
	ALAssetRepresentation *representation = [asset defaultRepresentation];
	UIImage *latestPhoto = [UIImage imageWithCGImage:[representation fullScreenImage]];
	[imageArray addObject:latestPhoto];
	if ([imageArray count]==[selectedIndexArr count]) {
	if ([self.ims_delegate respondsToSelector:@selector(ims_PickerController:didFinishPickingMediaItems:)]) {
	[self.ims_delegate ims_PickerController:self didFinishPickingMediaItems:imageArray];
	}
	}
	} failureBlock:^(NSError *error) {
	NSLog(@"Failure picking media");
	}];
	}];
	}
	-(void)viewDidDisappear:(BOOL)animated{
	thumbsArr = nil;
	urlArray = nil;
	selectedIndexArr = nil;
	}
	- (void)didReceiveMemoryWarning
	{
	[super didReceiveMemoryWarning];
	// Dispose of any resources that can be recreated.
	}
	@end

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