Swift3 #16

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1. farazhaider88 commented on Nov 24, 2016

   

   farazhaider88

   on Nov 24, 2016

   Author

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   any update on this please??
2. pboudoin commented on Jan 16, 2017

   

   pboudoin

   on Jan 16, 2017

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   Any update please?
3. iad24 commented on Feb 18, 2017

   

   iad24

   on Feb 18, 2017

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   to those who want it now:

   //
   // CustomCollectionViewLayout.swift
   // CustomCollectionLayout
   //
   // Created by JOSE MARTINEZ on 15/12/2014.
   // Copyright (c) 2014 brightec. All rights reserved.
   //

   import UIKit

   class CustomCollectionViewLayout: UICollectionViewLayout {

   let numberOfColumns = 8
   var itemAttributes : NSMutableArray!
   var itemsSize : NSMutableArray!
   var contentSize : CGSize!
   
   override func prepare() {
       if self.collectionView?.numberOfSections == 0 {
           return
       }
       
       if (self.itemAttributes != nil && self.itemAttributes.count > 0) {
           for section in 0..<self.collectionView!.numberOfSections {
               let numberOfItems : Int = self.collectionView!.numberOfItems(inSection: section)
               for index in 0..<numberOfItems {
                   if section != 0 && index != 0 {
                       continue
                   }
                   
                   let attributes : UICollectionViewLayoutAttributes = self.layoutAttributesForItem(at: IndexPath(item: index, section: section))
                   if section == 0 {
                       var frame = attributes.frame
                       frame.origin.y = self.collectionView!.contentOffset.y
                       attributes.frame = frame
                   }
                   
                   if index == 0 {
                       var frame = attributes.frame
                       frame.origin.x = self.collectionView!.contentOffset.x
                       attributes.frame = frame
                   }
               }
           }
           return
       }
       
       if (self.itemsSize == nil || self.itemsSize.count != numberOfColumns) {
           self.calculateItemsSize()
       }
       
       var column = 0
       var xOffset : CGFloat = 0
       var yOffset : CGFloat = 0
       var contentWidth : CGFloat = 0
       var contentHeight : CGFloat = 0
       
       for section in 0..<self.collectionView!.numberOfSections {
           let sectionAttributes = NSMutableArray()
           
           for index in 0..<numberOfColumns {
               let itemSize = (self.itemsSize[index] as AnyObject).cgSizeValue
               let indexPath = IndexPath(item: index, section: section)
               let attributes = UICollectionViewLayoutAttributes(forCellWith: indexPath)
               attributes.frame = CGRect(x: xOffset, y: yOffset, width: (itemSize?.width)!, height: (itemSize?.height)!).integral
               
               if section == 0 && index == 0 {
                   attributes.zIndex = 1024;
               } else  if section == 0 || index == 0 {
                   attributes.zIndex = 1023
               }
               
               if section == 0 {
                   var frame = attributes.frame
                   frame.origin.y = self.collectionView!.contentOffset.y
                   attributes.frame = frame
               }
               if index == 0 {
                   var frame = attributes.frame
                   frame.origin.x = self.collectionView!.contentOffset.x
                   attributes.frame = frame
               }
               
               sectionAttributes.add(attributes)
               
               xOffset += (itemSize?.width)!
               column += 1
               
               if column == numberOfColumns {
                   if xOffset > contentWidth {
                       contentWidth = xOffset
                   }
                   
                   column = 0
                   xOffset = 0
                   yOffset += (itemSize?.height)!
               }
           }
           if (self.itemAttributes == nil) {
               self.itemAttributes = NSMutableArray(capacity: self.collectionView!.numberOfSections)
           }
           self.itemAttributes .add(sectionAttributes)
       }
       
       let attributes : UICollectionViewLayoutAttributes = (self.itemAttributes.lastObject as AnyObject).lastObject as! UICollectionViewLayoutAttributes
       contentHeight = attributes.frame.origin.y + attributes.frame.size.height
       self.contentSize = CGSize(width: contentWidth, height: contentHeight)
   }
   
   override var collectionViewContentSize : CGSize {
       return self.contentSize
   }
   
   override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes! {
       //return self.itemAttributes[indexPath.section][indexPath.row] as! UICollectionViewLayoutAttributes
       let arr = self.itemAttributes[indexPath.section] as! NSMutableArray
       return arr[indexPath.row] as! UICollectionViewLayoutAttributes
   }
   
   override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
       var attributes = [UICollectionViewLayoutAttributes]()
       if self.itemAttributes != nil {
           for section in self.itemAttributes {
               
               let filteredArray  =  (section as! NSMutableArray).filtered(
                   
                   using: NSPredicate(block: { (evaluatedObject , bindings) -> Bool in
                       let a = evaluatedObject as! UICollectionViewLayoutAttributes
                       return rect.intersects(a.frame)
                   })
                   ) as! [UICollectionViewLayoutAttributes]
               
               
               attributes.append(contentsOf: filteredArray)
               
           }
       }
       
       return attributes
   }
   
   override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
       return true
   }
   
   func sizeForItemWithColumnIndex(_ columnIndex: Int) -> CGSize {
       var text : String = ""
       switch (columnIndex) {
       case 0:
           text = "Col 0"
       case 1:
           text = "Col 1"
       case 2:
           text = "Col 2"
       case 3:
           text = "Col 3"
       case 4:
           text = "Col 4"
       case 5:
           text = "Col 5"
       case 6:
           text = "Col 6"
       default:
           text = "Col 7"
       }
       
       let size : CGSize = (text as NSString).size(attributes: [NSFontAttributeName: UIFont.systemFont(ofSize: 17.0)])
       let width : CGFloat = size.width + 25
       return CGSize(width: width, height: 30)
   }
   
   func calculateItemsSize() {
       self.itemsSize = NSMutableArray(capacity: numberOfColumns)
       for index in 0..<numberOfColumns {
           self.itemsSize.add(NSValue(cgSize: self.sizeForItemWithColumnIndex(index)))
       }
   }
   

   }

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4. L-Jovi commented on Mar 14, 2017

   

   L-Jovi

   on Mar 14, 2017

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   @iad24 thanks for your example :)
5. starkindustries commented on Mar 16, 2017

   

   starkindustries

   on Mar 16, 2017

   Last edited by starkindustries

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   Hey everyone, I made a version using Storyboards instead of nibs. I also incorporated agoettler's changes to use native Swift arrays instead of NSMutableArray. The link is below. Let me know if you have questions or suggestions.
   https://github.com/starkindustries/CustomCollectionViewLayout

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