I am trying to create a UICollectionView
with 3 cells below each other.
This is working properly. When I touch one cell, this cell should expand, the others should collapse to a specific height. Also working just fine.
The problem which I cannot solve; when I tap a cell, and it expands like I wanted it to; it overlaps the one below this one. The one below does not move down to make room for this cells new height.
How can I fix this?
This is what I have so far related to the UICollectionView
and UICollectionViewCell
/**
* Tempory 3 items
*/
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
/**
* Defining the cells
*/
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! LicenseplateCollectionViewCell
cell.backgroundColor = .white
cell.layer.cornerRadius = 4
if(indexPath.row > 0){
cell.carStack.isHidden = true
}
return cell
}
/**
* Initial size
*/
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
// The first cell always start expanded with an height of 300
if(indexPath.row == 0){
return CGSize(width: collectionView.bounds.size.width, height: 300)
}else{
// The others start with an height of 80
return CGSize(width: collectionView.bounds.size.width, height: 80)
}
}
/**
* This functio shoud be handling everything like an accordeon system.
* When I touch one cell, the others should collapse.
*/
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
// Animate resize of cell after tapping
UIView.animate(withDuration: 0.2, animations: {
// For now I have 3 cells, which I will loop
for i in 0...2{
// If this is the active cell (I just tapped on) ...
if(indexPath.row == i){
let cell = collectionView.cellForItem(at: indexPath) as! LicenseplateCollectionViewCell
// This cell is expanded already, collapse it
if(cell.frame.size.height > 200){
cell.carStack.isHidden = true
cell.frame.size = CGSize(width: collectionView.bounds.size.width, height: 80)
}else{
// Open up this cell
cell.carStack.isHidden = false
cell.frame.size = CGSize(width: collectionView.bounds.size.width, height: 300)
}
}else{
// Other cells besides the one I just tapped, will be collapsed
print(indexPath.row, indexPath.section)
let customPath = IndexPath(row: i, section: 0)
print(customPath.row, customPath.section)
let cell = collectionView.cellForItem(at: customPath) as! LicenseplateCollectionViewCell
cell.carStack.isHidden = true
cell.frame.size = CGSize(width: collectionView.bounds.size.width, height: 80)
}
}
})
}
Best Answer
I have solved this. The animation/resize should not happen in the
didSelectItemAt
override.At first I have to define the array with cell configurations properly. Here I add a key 'active' with an boolean.
When I tap a cell, I switch the 'active' boolean to
true
within the objects array, and after that just callcollectionView.reloadData()
, this executes thesizeForItemAt
override before theUICollectionView
has been shown. This ensures the cell's are properly aligned and do exactly what they should do.In the
sizeForItemAt
I return the proper height based on the 'active' boolean within the objects array.