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I am writing a demo about the difference using compositional layout & traditional flow layout with UICollectionView.
UICollectionView
I found that if I want to set the cell’s width equal to the UICollectionView’s width , but the cell’s height is determined by the cell’s content (self-sizing only in vertical).
UICollectionView
This can be easily with compositional layout
let height = NSCollectionLayoutDimension.estimated(144)
let itemSize = NSCollectionLayoutSize(widthDimension: NSCollectionLayoutDimension.fractionalWidth(1), heightDimension: height)
But, if I use traditional flow layout, I can only set flow layout’s estimatedItemSize like this:
layout.estimatedItemSize = CGSizeMake(collectionView.width, 140)
But, after layout, the cell’s final width will always determined by the actual content, not the width equal to collectionView’s width.
This can be easily with compositional layout
let height = NSCollectionLayoutDimension.estimated(144)
let itemSize = NSCollectionLayoutSize(widthDimension: NSCollectionLayoutDimension.fractionalWidth(1), heightDimension: height)
This can be easily with compositional layout
let height = NSCollectionLayoutDimension.estimated(144)
let itemSize = NSCollectionLayoutSize(widthDimension: NSCollectionLayoutDimension.fractionalWidth(1), heightDimension: height)
let height = NSCollectionLayoutDimension.estimated(144)
let itemSize = NSCollectionLayoutSize(widthDimension: NSCollectionLayoutDimension.fractionalWidth(1), heightDimension: height)
But, if I use traditional flow layout, I can only set flow layout’s estimatedItemSize like this:
layout.estimatedItemSize = CGSizeMake(collectionView.width, 140)
But, after layout, the cell’s final width will always determined by the actual content, not the width equal to collectionView’s width.
But, if I use traditional flow layout, I can only set flow layout’s estimatedItemSize like this:
estimatedItemSize
layout.estimatedItemSize = CGSizeMake(collectionView.width, 140)
layout.estimatedItemSize = CGSizeMake(collectionView.width, 140)
But, after layout, the cell’s final width will always determined by the actual content, not the width equal to collectionView’s width.
collectionView
Is there any best practice about this kind vertical-only self-sizing?
Tags: ios,uicollectionview,uikit,uicollectionviewlayout,uicollectionviewflowlayoutSource of the question:
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