Get Image from URL and display them to Image Gallery AlAsset - ios

Question

I know this question might be asked many time but i am a beginner so kindly being gentle is a humble request.
I am trying to make an image gallery which displays all the images Of a URL.
I have used all asset framework and made a simple gallery which return the images of camera roll, I want to have the image of some URL so kindly help me to Get images from url and display them to Image Gallery
Here Is the view Controller header File
#import <UIKit/UIKit.h>
#import <AssetsLibrary/AssetsLibrary.h>
#interface ViewController : UIViewController <UICollectionViewDelegate,UICollectionViewDataSource>
#property (retain, nonatomic) IBOutlet UICollectionView *collectionView;
#property(nonatomic, strong) NSArray *assets;
Here is the Implementation file In which I have registered An .NIB file to add Cell to my CollectionView
#import "ViewController.h"
#import <AssetsLibrary/AssetsLibrary.h>
#import "MyCell.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self.collectionView registerNib:[UINib nibWithNibName:#"MyCell" bundle:nil] forCellWithReuseIdentifier:#"CELL"];
_assets = [#[] mutableCopy];
__block NSMutableArray *tmpAssets = [#[] mutableCopy];
// 1
here it is calliing defaultAssetsLibrary method which you can see later
ALAssetsLibrary *assetsLibrary = [ViewController defaultAssetsLibrary];
// 2
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
[group enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if(result)
{
// 3
[tmpAssets addObject:result];
}
}];
// 4
//NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:#"date" ascending:NO];
//self.assets = [tmpAssets sortedArrayUsingDescriptors:#[sort]];
self.assets = tmpAssets;
// 5
[self.collectionView reloadData];
} failureBlock:^(NSError *error) {
NSLog(#"Error loading images %#", error);
}];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - collection view data source
- (NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return self.assets.count;
}
// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (MyCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"CELL" forIndexPath:indexPath];
ALAsset *asset = self.assets[indexPath.row];
cell.asset = asset;
cell.backgroundColor = [UIColor redColor];
////
//=
cell.cellLabel.text = [NSString stringWithFormat:#"cell %i",indexPath.row];
return cell;
}
- (void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
ALAsset *asset = self.assets[indexPath.row];
ALAssetRepresentation *defaultRep = [asset defaultRepresentation];
UIImage *image = [UIImage imageWithCGImage:[defaultRep fullScreenImage] scale:[defaultRep scale] orientation:0];
// Do something with the image
}
And here is that method which I think returning the photo library
+ (ALAssetsLibrary *)defaultAssetsLibrary
{
static dispatch_once_t pred = 0;
static ALAssetsLibrary *library = nil;
dispatch_once(&pred, ^{
library = [[ALAssetsLibrary alloc] init];
});
return library;
}
Please Help me to get Images From URL and display them in Image Gallery.
As Far as MyCell file is concern.
Here is MYCell.m file
#interface MyCell ()
// 1
#property(nonatomic, strong) IBOutlet UIImageView *photoImageView;
#end
#implementation MyCell
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
}
return self;
}
- (void) setAsset:(ALAsset *)asset
{
// 2
_asset = asset;
self.photoImageView.image = [UIImage imageWithCGImage:[asset thumbnail]];
}

Answer 1

If we are getting images from URL we don't need AlAsset for image gallery really.
I have followed this tutorial to make the image gallery Guide and Simple passed the array of url and it worked for me.