I have a horizontal collection view that display only 2 images and each image takes up half the screen. I want to prevent scrolling by making images look like they are fixed and no move.
// sizeForItemAt
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if collectionView == self.topCollectionView {
let height = view.frame.size.height
let width = view.frame.size.width
return CGSize(width: width * (1/2), height: height * (1/2))
}
return CGSize()
}
// minimumLineSpacingForSectionAt
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
if collectionView == self.topCollectionView {
return 3
}
return 3
}
// insetForSectionAt
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
if collectionView == self.topCollectionView {
let sectionInset = UIEdgeInsets(top: 3, left: 4, bottom: 3, right: 4)
return sectionInset
}
let sectionInset2 = UIEdgeInsets(top: 3, left: 4, bottom: 3, right: 4)
return sectionInset2
}
Related
I have a collection view where two cells are in a row. Both have the same size and I want to have the same distance between them no matter how many cells are in the collection view.
Now I have found out that the distance only does not work with the iPhone 11 Pro. Be it on a real device or in a simulator.
Here are two images facing this problem:
This is my code for the size and spacing:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if storeModel.count != 0 {
let bounds = collectionView.bounds
let heightVal = self.view.frame.height
let widthVal = self.view.frame.width
let cellsize = (heightVal < widthVal) ? bounds.height/2 : bounds.width/2
return CGSize(width: cellsize - 10 , height: cellsize - 10 )
} else {
let width = collectionView.frame.width
let height = collectionView.frame.height
return CGSize(width: width - 20, height: height)
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 10
}
I have created CollectionView and its cell in storyboards, I try to set cell size and margins through UICollectionViewFlowLayout in code but no matter what I do margins don't change. Changing size in storyboards also doesn't change anything
screenshot.
I'm always getting these margins:
screenshot
What am I doing wrong?
let itemsPerRow = 1
let sectionInsets = UIEdgeInsets(top: 1.0, left: 1.0, bottom: 1.0, right: 1.0)
extension VideoVC: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let paddingSpace = sectionInsets.left + sectionInsets.right
let widthPerItem = collectionView.bounds.width - paddingSpace
return CGSize(width: widthPerItem, height: 265)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return sectionInsets
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 5
}
I am trying to create 2x2 grid layout using collection view.
I have used below code. It's kind of working fine for iPhone 5 but with tweaks. I am trying to write code that can be used on all screen sizes. This is not working on iPhone 6.
public func numberOfSections(in collectionView: UICollectionView) -> Int {
return 2
}
public func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
if let cell1 = cell as? CollectionViewCell {
return cell1
}
return cell
}
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding: CGFloat = 20
let collectionViewSize = collectionView.frame.size.width - padding
return CGSize(width: collectionViewSize/2, height: collectionViewSize/2+15)
}
public func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
insetForSectionAt section: Int
) -> UIEdgeInsets {
return UIEdgeInsets(
top: 5, left: 5, bottom: 5, right: 5
)
}
public func collectionView(
_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 5
}
public func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 5
}
I am trying to achieve following layout:
In future this grid can be like 2 columns only and N rows. Each row will always have 2 items.
First of all, get three variables together depending on your needs. Those are the minimum spacing (Both InteritemSpacing and Line spacing - Should be same UXwise but you can change that in delegate methods if you like. The interitem space however must always be equal to minimumSpacing), edgeInsetPadding and the number of items you want in a row.
private var numberOfItemsInRow = 2
private var minimumSpacing = 5
private var edgeInsetPadding = 10
In your code, you have already defined your Edge Insets as:
UIEdgeInsets(
top: 5, left: 5, bottom: 5, right: 5
)
The left and right insets are important for correctly determining the size of the item. left+right gives us a grand sum of 10. This should be assigned to edgeInsetPadding like this:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
let inset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)
edgeInsetPadding = inset.left+inset.right
return inset
}
Now lets get to your UICollectionViewDelegateFlowLayout. Update the following methods.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return minimumSpacing
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return minimumSpacing
}
Now lets get to the main part. Modify your sizeForItemAt in UICollectionViewDelegateFlowLayout as:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = (Int(UIScreen.main.bounds.size.width) - (numberOfItemsInRow - 1) * minimumSpacing - edgeInsetPadding) / numberOfItemsInRow
return CGSize(width: width, height: width)
}
And this is it. You now get two equal size tiles in 2x2 grid. If you want to change this in future, just change the numberOfItemsInRow variable to something else. Like 3 for 3x3.
This will be done using the item size of the collectionViewCell
collectionView.delegate = self
extension ViewController : UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding = 5
let width = (collectionView.frame.size.width - CGFloat(padding) * 2) / CGFloat(2)
let height = width / 200 * 110 // or what height you want to do
return CGSize(width: width, height: height)
}
}
Use:
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
let padding: CGFloat = 20
let size = self.view.frame.width - padding
return CGSize(width: size/2, height: size/2+15)
}
I have a problem with a horizontal scroll in collectionView.
I want to scroll by section. I have 3 sections. I want to center it in the view.
First, it looks how I want
But when I scroll next... Left and right insets are different.
The last one is broken too.
I tried it with function scrollViewDidEndDecelerating, but it didn't work. Animation of it was ugly.
My code of collectionView layout.
let layout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 0, left: 15, bottom: 0, right: 15)
layout.minimumLineSpacing = 5
layout.scrollDirection = .horizontal
You have to implement UICollectionViewDelegateFlowLayout methods to solve this problem.
let minLineSpace = 4
func collectionView(_ collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: UIScreen.main.bounds.width - minLineSpace, height: collectionView.frame.size.height)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return minLineSpace
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(0, (minLineSpace / 2), 0, (minLineSpace / 2))
}
Here I have added 4 point spacing between two cells, you can customise this as per your requirement.
collection view had multiple images working fine. it's showing like this
But i want show like this way
this is code of collection view cell
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 10, left: 0, bottom: 20, right: 0)
let width = UIScreen.main.bounds.width
layout.itemSize = CGSize(width: width/2 , height: width/2 )
layout.minimumInteritemSpacing = 0
layout.minimumLineSpacing = 0
collectionView!.collectionViewLayout = layout
Just implement some UICollectionViewDelegateFlowLayout methods to get the correct size and spacing of the UICollectionViewCells.
Example:
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize
{
let cellSize = CGSize(width: (collectionView.bounds.width - (3 * 10))/2, height: 120)
return cellSize
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat
{
return 10
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets
{
let sectionInset = UIEdgeInsetsMake(10, 10, 10, 10)
return sectionInset
}
Just change the size and spacing values according to your requirement.
Add this method on your viewcontroller
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: IndexPath) -> CGSize {
return CGSize(width: ((self.view.frame.size.width/2) - 10), height: 255)
}
Try,
collectionViewCellImageView.contentMode = .scaleToFill
You can try to set minimum spacing for cell & line for collection view and implement the bellow delegate
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: (collectionView.frame.width/2) - 5, height: collectionView.frame.width/2)
}