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PinterestLayout 1.0.3

PinterestLayout 1.0.3

×

TestsTested ✗
LangLanguage SwiftSwift
License MIT
ReleasedLast Release Jul 2017
SwiftSwift Version 3.0
SPMSupports SPM ✗

Maintained by Roman Sorochak.

PinterestLayout 1.0.3

  • By
  • Roman Sorochak

PinterestLayout

Custom collection view layout with different image and text sizes.

PinterestVC Custom Cell
Demo Demo

Contents

Requirements

  • iOS 8.0+
  • Swift 3.0+

Usage

PinterestVC subclass

  • All you need to do is to sublcass from PinterestVC and provide items to be shown.
  • PinterestVC will calculate image and text sizes.
import UIKit
import PinterestLayout

class MyPinterestVC: PinterestVC {
    
    override public func viewDidLoad() {
        super.viewDidLoad()
        
        let text = "Some text. Some text. Some text. Some text."
        
        items = [
            PinterestItem(image: UIImage(named: "new_york"), text: text),
            PinterestItem(image: UIImage(named: "bigben_river"), text: text),
            PinterestItem(image: UIImage(named: "dubai"), text: text),
            PinterestItem(image: UIImage(named: "4"), text: text),
            PinterestItem(image: UIImage(named: "tiger"), text: text)
        ]
    }
}

Using custom cell

0 - Import PinterestLayout

import PinterestLayout

1 - Set PinterestLayout to your collection view.

let layout = PinterestLayout()
collectionView.collectionViewLayout = layout

2 - Setup layout

layout.delegate = self
layout.cellPadding = 5
layout.numberOfColumns = 2

3 - Implement methods of PinterestLayoutDelegate

/**
Height for image view in cell.
     
@param collectionView - collectionView
@param indexPath - index path for cell
     
Returns height of image view.
*/
func collectionView(collectionView: UICollectionView,
                    heightForImageAtIndexPath indexPath: IndexPath,
                    withWidth: CGFloat) -> CGFloat
    
/**
Height for annotation view (label) in cell.
     
@param collectionView - collectionView
@param indexPath - index path for cell
     
Returns height of annotation view.
*/
func collectionView(collectionView: UICollectionView,
                    heightForAnnotationAtIndexPath indexPath: IndexPath,
                    withWidth: CGFloat) -> CGFloat
  • PinterestLayout provides public API to easily calculate the best imageview and text heigths based on available width.
public extension UIImage {
    /**
     Calculates the best height of the image for available width.
     */
    public func height(forWidth width: CGFloat) -> CGFloat
//...
public extension String {
    /**
     Calculates the best height of the text for available width and font used.
     */
    public func heightForWidth(width: CGFloat, font: UIFont) -> CGFloat
  • So implementation of PinterestLayoutDelegate might be:
extension CustomCollectionVC: PinterestLayoutDelegate {
    
    func collectionView(collectionView: UICollectionView,
                        heightForImageAtIndexPath indexPath: IndexPath,
                        withWidth: CGFloat) -> CGFloat {
        let image = images[indexPath.item]
        
        return image.height(forWidth: withWidth)
    }
    
    func collectionView(collectionView: UICollectionView,
                        heightForAnnotationAtIndexPath indexPath: IndexPath,
                        withWidth: CGFloat) -> CGFloat {
        let textFont = UIFont(name: "Arial-ItalicMT", size: 11)!                
        return "Some text".heightForWidth(width: withWidth, font: textFont)
    }
}

4 - Create custom cell and apply PinterestLayoutAttributes

class CollectionViewCell: UICollectionViewCell {
//...
override func apply(_ layoutAttributes: UICollectionViewLayoutAttributes) {
        super.apply(layoutAttributes)
        if let attributes = layoutAttributes as? PinterestLayoutAttributes {
            //change image view height by changing its constraint
            imageViewHeightLayoutConstraint.constant = attributes.imageHeight
        }
    }
}

Tips

  • PinterestLayout fully supports collection view headers and footers. So you can have may sections.
  • In case you load data asynchronously please follow next steps:
  1. Do not use PinterestVC as parent class to your view controller. Use custom cell approach.
  2. Make sure server returns image sorce with its sizes (height and width)
{
    "src": "/upload/resize_cache/iblock/8e7/204_265_2/8e7f1f04d5e835f596ef33da74946847.jpg",
    "width": 204,
    "height": 265
}
  1. when data is loaded invalidate layout as well as reload data on collection view.
collectionView.collectionViewLayout.invalidateLayout()
collectionView.reloadData()

Contact us

Contact our team on email - [email protected]

License

Reusable is released under the MIT license. See LICENSE for details.