I want to make a UICollectionView that looks like this:
[ - - - - - 0 - - - - - ] -> Scrolls Horizontally
[1][2][3][4][5][6][7][8] -> Scrolls Horizontally
How is it done?
I'd prefer not to place UICollectionView in a UITableViewCell as well.
Make your subclass inherit the CollectionViewFlowLayoutDelegate protocol
func collectionView(collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
let size = CGSize(width: defaultWidth, height: collectionView.height / 2)
//The important thing here is the height of your item is half the height of collectionView and then your flowlayout will start to put them on top of eachother.
// Also make sure that height accounts for section and content insets
return size
}
Then just make sure in viewDidLoad() you set the scrolling properties of collectionView to only horizontal scrolling.
Related
I have implemented UICollectionView with the vertical scrolling and paging, first image showing properly but after scrolling layout get changed.
Code -
// MARK: - UICollectionViewDelegateFlowLayout
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: self.collectionView.frame.width, height: self.collectionView.frame.height)
}
I enable the paging from UICollectionView
Also attached images below.
Thanks in advance.
pls check below screen sort setting of collectionview into storyboard.
Estimate size none
others min spacing for cells & for lines are zero or not
I just can´t get familar with auto layout in Xcode. When I set trailing and leading constrains for Header Stack View, Bottom Stack View or the image between them, then the size (height/width) of my cell changes. Why does it happen and how can I avoid it? I think something isn´t right with the kind I build layouts. I am very grateful for any help.
I set the cell size with this code:
extension MainVC: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let height = view.frame.size.height
let width = view.frame.size.width
return CGSize(width: width * 0.42, height: height * 0.3)
}
}
My cell layout:
This is how the app looks when I use constrains for the Bottom Stack View.
This is without constrains for the Bottom Stack View (correct cell size).
Cells can now self-size with auto layout and ignore what you return in collectionView(_:layout:sizeForItemAt:). If you want to use collectionView(_:layout:sizeForItemAt:), change Estimate size to None in the storyboard.
https://stackoverflow.com/a/58369142/14351818
I am using
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 400, height: 600)
}
to specify my CollectionView's cell sizes. It works fine but as soon as I add a width constraint (UILabel.width == ContentView.width) to my UILabel inside the ContentView of the cell, the cell's width shrinks to the intrinsic width of the UILabel.
I am using UICollectionViewDelegateFlowLayout and horizontal scrolling.
How can I force the ContentView to stick to the cell size I specified and let the subviews follow the auto layout constraints?
The problem is that in the storyboard your collection view's Estimate Size is configured to Automatic:
You need to set it to None if you want your sizeForItemAt implementation to be obeyed rather than the internal constraints.
I have an application where I am using collectionview to display content which includes imageview, about 4 uilabels and a stackview which are all constrained to each other. This cell is scrollable vertically and not horizontally as I have to make provison for larger screen size like the iPad. The problem I have now is my CollectionViewFlowLayout height is static, How can I make it dynamic so that it resizes base on the height of the retuned content. the text of the label could vary so how do I handle this
below is how I have made my cell
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: collectionView.bounds.size.width, height: 400)
}
further code would be added on request and any help is appritiated
The horizontal scrolling in UICollectionView only returns one row and I need to make a horizontal scrolling collection view with 2 rows just like the image below
[1]: https://i.stack.imgur.com/Vs1kt.png :[1]
You need to set fix height of the CollectionView and then use sizeForItemAt() under UICollectionViewDelegateFlowLayout which returns CGSize. You have to manage the cell height something like this.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: 50.0, height: collectionViewHeight / 2) //<-- Manage height and width accordingly.
}