Delete selected Items in collection view - ios

Question

I select 5 items in my collection view and i want to delete it. Please help me delete the selected items. I put one button and when i press that button all selected items are delete that i want. My button click code.
- (IBAction)btn_delete:(id)sender {
NSArray *selectedItemsIndexPaths = [self.MyCollectionView indexPathsForSelectedItems];
NSLog(#"Selected images: %#",mySelectedArray);
[self.MyCollectionView deleteItemsAtIndexPaths:selectedItemsIndexPaths];
[self.MyCollectionView reloadData];
}

Answer 1

First remove Objects for DataSource, then try delete cells from Collectionview
-(void)deleteCellInCollectionViewAtIndex:(int)index{
if (self.collectionView) {
[self.collectionView performBatchUpdates:^{
NSIndexPath *cellIndexPath = [NSIndexPath indexPathForRow:index inSection:0] ;
[self.collectionView deleteItemsAtIndexPaths:#[cellIndexPath]];
} completion:nil];
}
}

Answer 2

#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#pragma Mark For Collection View Methods
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [patternImageArray count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
static NSString *identifier = #"Cell";
PatternViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
NSString *myPatternString = [patternImageArray objectAtIndex:indexPath.row];
cell.ImageView.image = [UIImage imageNamed:myPatternString];
cell.ImageLabel.text = myPatternString;
ind = indexPath.row;
return cell; }
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
PatternViewCell *mySelectedCell = (PatternViewCell*)[collectionView cellForItemAtIndexPath:indexPath];
mySelectedCell.ImageLabel.backgroundColor = [UIColor blueColor];
mySelectedCell.ImageLabel.textColor = [UIColor whiteColor];
[mySelectedArray addObject:indexPath];
i = indexPath.row; }
- (void)viewDidLoad {
[super viewDidLoad];
patternImageArray = [[NSMutableArray alloc]initWithObjects:#"Thar.jpg",#"Thar1.jpg",#"Thar2.jpg",#"Thar3.jpg",#"Thar4.jpg",#"Thar5.jpg",#"Thar6.jpg",#"Thar7.jpg",#"Thar8.jpg", nil];
self.MyCollectionView.multipleTouchEnabled = YES;
mySelectedArray = [[NSMutableArray alloc]init]; }
- (IBAction)btn_delete:(id)sender
{
[self.MyCollectionView reloadData];
NSLog(#"Selected images: %#",mySelectedArray);
}
#end

Answer 3

In your btn_delete: method, add this code
NSArray *selectedItemsIndexPaths = [self.MyCollectionView indexPathsForSelectedItems];
NSMutableIndexSet *indexSet = [[NSMutableIndexSet alloc] init];
for (NSInteger counter = 0; counter < [mySelectedArray count]; counter++) {
NSIndexPath *indexPath = mySelectedArray[counter];
[indexSet addIndex:indexPath.row];
}
[patternImageArray removeObjectsAtIndexes:indexSet];
[self.collectionView performBatchUpdates:^{
[self.collectionView deleteItemsAtIndexPaths:mySelectedArray];
} completion:^(BOOL finished) {
[mySelectedArray removeAllObjects];
}];
In your collectionView:didSelectItemAtIndexPath: method, you should first check if array already contains that indexpath before adding to array.
You can see it below:
if(![mySelectedArray containsObject:indexPath])
[mySelectedArray addObject:indexPath];