I am using a collectionView
to show images after fetching from Coredatabase
. However , none on the methods are being called except numberOfItemsInSection
& numberOfSectionsInCollectionView
. The delegates and data source are set properly.
Also the identifier of cell is photoCell and class is JLTPhotoCell
.
- (void)viewDidLoad
{
[super viewDidLoad];
_thumbNails = [[NSArray alloc]init]; // its declared ,don't worry about this
_thumbNails = [[LADataModelController getSingleton] getAllSignatures];
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
[layout setItemSize:( CGSizeMake(50,50))];
[_collectionView setCollectionViewLayout:layout];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
[_collectionView registerClass:[JLTPhotoCell class] forCellWithReuseIdentifier:@"photoCell"];
[self.view addSubview:self.collectionView];
self.collectionView.allowsSelection = true;
}
- (NSInteger)collectionView:(UICollectionView *)view numberOfItemsInSection:(NSInteger)section
{
NSLog(@"count %i" , _thumbNails.count);
return _thumbNails.count;
}
- (NSInteger)numberOfSectionsInCollectionView: (UICollectionView *)collectionView
{
return 1;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
if (_thumbNails.count > 0)
{
JLTPhotoCell *cell = [cv dequeueReusableCellWithReuseIdentifier:@"photoCell" forIndexPath:indexPath];
NSData *thumbnailData = ((LASignature*)[_thumbNails objectAtIndex:indexPath.row]).signatureImage;
UIImage* thumbnailImage = [UIImage imageWithData:thumbnailData];
[cell setThumbnail:thumbnailImage];
NSLog(@"image:%@",thumbnailImage);
if (!_buttonSelect.hidden)
{
[cell performSelected:FALSE];
}
return cell;
}
return nil;
}
#pragma mark UICollectionViewDelegate Methods
-(void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
_lastSelectedSign = [_thumbNails objectAtIndex:indexPath.row];
if (!self.buttonSelect.hidden)
{
JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionView cellForItemAtIndexPath:indexPath];
cell.selected = FALSE;
}
else
{
[_selectedImages addObject:[_thumbNails objectAtIndex:indexPath.row]];
JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionView cellForItemAtIndexPath:indexPath];
[cell performSelected:TRUE];
// _buttonDelete.enabled = _selectedImages.count > 0;
}
}
-(void) collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
[_selectedImages removeObject:[_thumbNails objectAtIndex:indexPath.row]];
JLTPhotoCell *cell = (JLTPhotoCell *)[_collectionView cellForItemAtIndexPath:indexPath];
[cell performSelected:FALSE];
_buttonDelete.enabled = _selectedImages.count > 0;
}
#pragma mark - UICollectionViewDelegateFlowLayout
-(CGSize) collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(50,50) ;
}
-(UIEdgeInsets) collectionView:(UICollectionView *)collectionView layout:(UICollectionViewFlowLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
collectionViewLayout.minimumInteritemSpacing=1;
collectionViewLayout.minimumLineSpacing =2;
return UIEdgeInsetsMake(1, 1, 1, 1);
}
jltPhotoCell Class
-(void) setThumbnail:(UIImage *) thumbnail
{
[self setThumbnail:thumbnail andWithSize:(CGSizeMake(50,50))];
}
-(void) setThumbnail:(UIImage *) thumbnail andWithSize:(CGSize) size
{
UIImageView *thumbImageView = [[UIImageView alloc] initWithImage:thumbnail];
thumbImageView.frame = CGRectMake(0,0,size.width,size.height);
thumbImageView.userInteractionEnabled = YES;
[self.contentView addSubview:thumbImageView];
}
-(void) performSelected:(bool)selected
{
if (selected)
{
UIImageView *deleteImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"delete"]];
deleteImageView.frame = CGRectMake(self.contentView.frame.size.width - 35, 3, 32, 32);
deleteImageView.tag = 123;
[self.contentView addSubview:deleteImageView];
}
else
{
UIView *v = [self.contentView viewWithTag:123];
v.hidden = YES;
[self.contentView bringSubviewToFront:v];
[v removeFromSuperview];
}
}
Any suggestion would be appreciated. thanks.
As @highlycaffeinated I ran into this problem to. However calling invalidateLayout didn't work for me.
However assigning the delegate AFTER the datasource worked.
I changed:
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
with:
self.collectionView.dataSource = self;
self.collectionView.delegate = self;
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