For expanding label in UICollectionViewCell, I am using this library
My code is as below:
label.delegate = self
label.shouldCollapse = true
label.numberOfLines = 4
label.collapsed = true
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let size: CGSize = "Modern Furniture reflects the design ilosophy of form following function prevalent in modernism. These designs represent the ideals of cutting excess, practicality and an absence of decoration.".size(withAttributes: [NSAttributedString.Key.font: UIFont.font_light(14)])
return CGSize(width: collectionView.frame.size.width , height: size.height + 390)
}
This thing works for UITableViewCell but it isn't working for UICollectionViewCell. In fact, the labels delegate methods are also not called.
Related
I'm trying to have collection view with 2 column but dynamic height.
I have used Autolayout and given required constraints to the Cell
By this way I can calculate the dynamic height but its column grids fails.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! MenuListCollectionViewCell
cell.frame.size.width = collectionView.frame.width/2
cell.menuList = self.menuList[indexPath.row]
let resizing = cell.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize, withHorizontalFittingPriority: UILayoutPriority.required, verticalFittingPriority: UILayoutPriority.fittingSizeLevel)
return resizing
}
This is how I want it to look
Not sure what you mean by "its column grid fails".
Anyway, you need to write a custom collection view layout. The default one (UICollectionViewFlowLayout) allows you to change height of the cells by providing the sizeForItemAt, but that won't change the behavior of the layout that will always arrange cells in rows of the same height (the height of the highest cell).
If I understood correctly, you just want the same layout of this raywenderlich tutorial.
Basically:
Create a subclass of UICollectionViewLayout implementing it's methods:
collectionViewContentSize: return width and height of the collection view content
prepare: where you can calculate the sizes of cells and
collectionView content
layoutAttributesForElements: where you
return an array of UICollectionViewLayoutAttributes in the given
rect
layoutAttributesForItem: where you return the same kind
of attributes, this time specific for an item
assign an object of this class to the collection view layout property
you can use this
This code is somehow written that you can change section inset or minimumInteritemSpacing and this calculate and resize with this parameters
you can use this code or download project from Github
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let numberofItem: CGFloat = 2
let flowLayout = collectionViewLayout as! UICollectionViewFlowLayout
let collectionViewWidth = self.collectionView.bounds.width
let extraSpace = (numberofItem - 1) * flowLayout.minimumInteritemSpacing
let inset = flowLayout.sectionInset.right + flowLayout.sectionInset.left
let width = Int((collectionViewWidth - extraSpace - inset) / numberofItem)
return CGSize(width: width, height: width)
}
I was able to achieve your desired outcome by doing the following.
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 20
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return CGSize(width: (self.view.frame.size.width/2 - 5), height: 100)
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = customCollectionView.dequeueReusableCell(withReuseIdentifier: "test", for: indexPath)
cell.layer.backgroundColor = UIColor.red.cgColor
return cell
}
Make sure you have implemented all the correct delegates
UICollectionViewDelegate
UICollectionViewDatasource
UICollectionViewDelegateFlowLayout
where you see height: make it your own desired height as you have specified in your question.
KEY: Make sure in your storyboard you have set the estimate size of the collection view to NONE -> otherwise the code will not work as expected
I am implementing UICollection view with customcell. Here, I need to create dynamic width based on customcell label string and static Height need to set. Here, I used below code for dynamic width don’t know about static height. How to achieve this?
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
return (items[indexPath.row] as String).size(withAttributes: nil)
//return CGSize(width: label.frame.width, height: 33.5)
}
}
Calculate the collectionViewCell's width based on the text that you want to add in the label.
Assuming that items is an array of String,
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let textWidth = items[indexPath.row].size(withAttributes:[.font: UIFont.systemFont(ofSize: 20.0)]).width + 30.0 //30.0 is the extra padding
let width = min(textWidth, 100.0) //100.0 is the max width
return CGSize(width: width, height: collectionView.bounds.height)
}
}
Add the attributes and the height as per your requirement.
Guys I want to change the size of the cell like this
Auto adjusting to the text. what I am able to achieve is
I have tried to search but not able to find out the solution. How can I make it dynamic to text.
The tags are coming from a model class and the colour and background is changing from custom class for the cell.
Its explained in the answer below.
HorizontalCollectionView Content width and spacing
Calculate size of string with associate font.
extension String {
func size(with font: UIFont) -> CGSize {
let fontAttribute = [NSAttributedString.Key.font: font]
let size = self.size(withAttributes: fontAttribute)
return size
}
}
Return the calculated width along with collectionView height in collectionView(_, collectionViewLayout:_, sizeForItemAt).
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let newWidth = titles[indexPath.row].size(with: labelFont!).width + 10 //Added 10 to make the label visibility very clear
return CGSize(width: newWidth, height: collectionView.bounds.height)
}
Check the code below:-
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let btn = UIButton()
btn.setTitle(?*self.arr[indexPath.row].name, for: .normal)
let btnWidth = ?*btn.intrinsicContentSize.width > UIScreen.main.bounds.width - 32 ? ?*btn.intrinsicContentSize.width - 32 : ?*btn.intrinsicContentSize.width
return CGSize(width: (?*btnWidth), height: 48)
}
You can modify it according to your requirement. Comment if you need any help in this.
Hope it helps :)
Im currently attempting to calculate the height of a UICollectionViewCell dynamically but using a UILabel (the dynamic property) and the current height of the cell. The height is calculated by getting height for sizeThatFits of the label within the cell and adding that value to the original height of the cell. For some reason this always returns 0 in sizeForItemAt. I'm pretty sure the problem is the size is being calculated before the cell is created thus will always return 0. Is there anyway around this? (The UI for the cell is created within the class itself, not at celllForItemAt could that also be a problem?)
var descHeight: CGFloat = 0
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "desc", for: indexPath) as! ImageDescCell
descHeight = cell.descriptionLbl.sizeThatFits(cell.frame.size).height + cell.bounds.height
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let w = collectionView.bounds.width
return CGSize(width: w, height: descHeight)
}
NSAttributedString can tell you how big an instance is, given a bound. So assuming you know how wide the label is and you know what the text is and what its attributes are you can get the size without ever creating a label:
let width = CGFloat(200)
let attributedString = NSAttributedString(string: "Test", attributes: [NSFontAttributeName : UIFont(name: "Helvetica", size: 18)!])
let boundingRect = attributedString.boundingRect(with: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude), options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil)
swift-3.0
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
{
let width = self.collectionView.frame.size.width
let Height = self.view.frame.size.height - 64 // 64 is a navigation bar height minus.
let cellSize:CGSize = CGSize(width: width, height: Height )
return cellSize
}
I am displaying a UICollectionView with some phrases/words. Each phrase can be different size. For some reason there is a big gap between few of my phrases as shown in the screenshot below:
I am using the following code to determine the size of each cell.
func collectionView(collectionView: UICollectionView,
layout collectionViewLayout: UICollectionViewLayout,
sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
let phrase :String = self.phrases[indexPath.row]
let size = phrase.sizeWithAttributes(nil)
let doubleSize = CGSize(width: size.width * 2, height: size.height * 2)
print("\(size.width) and \(size.height)");
return doubleSize
}