单击UICollectionview单元格后直到滚动，图像未显示在UIImageview上

Question

i need help regarding uicollectionview.I have an app with uicollectionview horizontal scrolling.The collectionview cell display images from array.when i clicked on any cell log show the cell index means cell get tapped.But the image on that cell did not display on my UIImageView until i scroll the collectionview.I just need when any cell get tapped, the tapped image show up on my UIimageview without scrolling the uicollectionview.Here is my Code

(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{


    _previewCoverImage.image=_objects[indexPath.row];

  }

Answer 1

Once you click on any cell, save the index number and then call [_itemsCollectionView reloadData] and then in

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath

this method checks the clicked cell and whether indexpath.row is the same or not. If it's the same, then display:-

_previewCoverImage.image=_objects[indexPath.row];

Example:

int index = -1;

-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
  index = indexPath.row;
  [collectionView reloadData];
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  if(indexPath.row == index) {
    _previewCoverImage.image=_objects[indexPath.row];
  } else {
    // Display label with index number or whaterever you want
    // or you can just ignore else part.
  }
}

Answer 2

After multiple trying I finally got the solution. I just need to add the reloadData method in didSelectItemAtIndexPath . Here is the code:

(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
    _previewCoverImage.image=_objects[indexPath.row];
    [_magCoverView reloadData];
  }

_objects is an array where you get the images and _magCoverView is a collectionView .

Answer 3

(:-Hope it helps do like this//if any mistakes let me know guys.

BOOL isSelected;
unsigned short int selectedIndex;
//Declare like this in ViewController.h
//add following code in didSelectItem method
if(isSelected)
{
    [self reloadCell:selectedIndex];
}
isSelected=YES;
selectedIndex=indexPath.row;
///
-(void)reloadCell:(unsigned short int) index
{
    //you can call reload collection view cell here
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];

    [serviceCollection performBatchUpdates:^{
        [serviceCollection reloadItemsAtIndexPaths:@[indexPath]];
    } completion:^(BOOL finished) {}];

}