Как установить UICollectionView нижнее заполнение и размер прокрутки

Question

Привет У меня есть uicollectionview пользовательский макет, и у меня есть issues для bottom padding и scrolling sizes. Под ниже picture вы можете видеть;

Также верхняя сторона первая ячейка всегда остается на вершине при прокрутке (левая сторона ячейки не должны всегда оставаться прямо сейчас никаких проблем нет, но верхняя сторона ячейка должна быть прокрутки при прокрутке)

Я пытаюсь установить в viewDidLoad под ниже кодов, но dont работа

self.automaticallyAdjustsScrollViewInsets = false 
self.collectionView.contentInset = UIEdgeInsetsMake(20, 20, 120, 100); 

Мой заказ collectionview layout файл

import UIKit 

public var CELL_HEIGHT = CGFloat(22) 

protocol CustomCollectionViewDelegateLayout: NSObjectProtocol { 

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, widthForItemAtIndexPath indexPath: NSIndexPath) -> CGFloat 
} 

class CustomCollectionViewLayout: UICollectionViewLayout { 

    // Used for calculating each cells CGRect on screen. 
    // CGRect will define the Origin and Size of the cell. 

    let STATUS_BAR = UIApplication.sharedApplication().statusBarFrame.height 

    // Dictionary to hold the UICollectionViewLayoutAttributes for 
    // each cell. The layout attribtues will define the cell's size 
    // and position (x, y, and z index). I have found this process 
    // to be one of the heavier parts of the layout. I recommend 
    // holding onto this data after it has been calculated in either 
    // a dictionary or data store of some kind for a smooth performance. 
    var cellAttrsDictionary = Dictionary<NSIndexPath, UICollectionViewLayoutAttributes>() 

    // Defines the size of the area the user can move around in 
    // within the collection view. 
    var contentSize = CGSize.zero 

    // Used to determine if a data source update has occured. 
    // Note: The data source would be responsible for updating 
    // this value if an update was performed. 
    var dataSourceDidUpdate = true 

    weak var delegate: CustomCollectionViewDelegateLayout? 

    override func collectionViewContentSize() -> CGSize { 
     return self.contentSize 
    } 

    override func prepareLayout() { 

     // Only update header cells. 
     if !dataSourceDidUpdate { 

      // Determine current content offsets. 
      let xOffset = collectionView!.contentOffset.x 
      let yOffset = collectionView!.contentOffset.y 

      if collectionView?.numberOfSections() > 0 { 
       for section in 0...collectionView!.numberOfSections()-1 { 

        // Confirm the section has items. 
        if collectionView?.numberOfItemsInSection(section) > 0 { 

         // Update all items in the first row. 
         if section == 0 { 
          for item in 0...collectionView!.numberOfItemsInSection(section)-1 { 

           // Build indexPath to get attributes from dictionary. 
           let indexPath = NSIndexPath(forItem: item, inSection: section) 

           // Update y-position to follow user. 
           if let attrs = cellAttrsDictionary[indexPath] { 
            var frame = attrs.frame 

            // Also update x-position for corner cell. 
            if item == 0 { 
             frame.origin.x = xOffset 
            } 

            frame.origin.y = yOffset 
            attrs.frame = frame 
           } 

          } 

          // For all other sections, we only need to update 
          // the x-position for the fist item. 
         } else { 

          // Build indexPath to get attributes from dictionary. 
          let indexPath = NSIndexPath(forItem: 0, inSection: section) 

          // Update y-position to follow user. 
          if let attrs = cellAttrsDictionary[indexPath] { 
           var frame = attrs.frame 
           frame.origin.x = xOffset 
           attrs.frame = frame 
          } 

         } 
        } 
       } 
      } 


      // Do not run attribute generation code 
      // unless data source has been updated. 
      return 
     } 

     // Acknowledge data source change, and disable for next time. 
     dataSourceDidUpdate = false 

     var maxWidthInASection = CGFloat(0) 

     // Cycle through each section of the data source. 
     if collectionView?.numberOfSections() > 0 { 
      for section in 0...collectionView!.numberOfSections()-1 { 

       // Cycle through each item in the section. 
       if collectionView?.numberOfItemsInSection(section) > 0 { 

        var prevCellAttributes: UICollectionViewLayoutAttributes? 

        for item in 0...collectionView!.numberOfItemsInSection(section)-1 { 

         let cellIndex = NSIndexPath(forItem: item, inSection: section) 

         guard let width = delegate?.collectionView(collectionView!, layout: self, widthForItemAtIndexPath: cellIndex) else { 
          print("Please comform to CustomCollectionViewDelegateLayout protocol") 
          return 
         } 

         // Build the UICollectionVieLayoutAttributes for the cell. 

         var xPos = CGFloat(0) 
         let yPos = CGFloat(section) * CELL_HEIGHT 

         if let prevCellAttributes = prevCellAttributes { 
          xPos = CGRectGetMaxX(prevCellAttributes.frame) 
         } 

         let cellAttributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: cellIndex) 
         cellAttributes.frame = CGRect(x: xPos, y: yPos, width: width, height: CELL_HEIGHT) 

         // Determine zIndex based on cell type. 
         if section == 0 && item == 0 { 
          cellAttributes.zIndex = 4 
         } else if section == 0 { 
          cellAttributes.zIndex = 3 
         } else if item == 0 { 
          cellAttributes.zIndex = 2 
         } else { 
          cellAttributes.zIndex = 1 
         } 

         // Save the attributes. 
         cellAttrsDictionary[cellIndex] = cellAttributes 
         prevCellAttributes = cellAttributes 

         let maxX = CGRectGetMaxX(cellAttributes.frame) 

         if maxWidthInASection < maxX { 
          maxWidthInASection = maxX 
         } 
        } 
       } 

      } 
     } 

     // Update content size. 
     let contentWidth = maxWidthInASection 
     let contentHeight = Double(collectionView!.numberOfSections()) 
     self.contentSize = CGSize(width: Double(contentWidth), height: contentHeight) 
     self.contentSize.height = CGFloat(Double(collectionView!.numberOfSections())) 


    } 

    override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? { 

     // Create an array to hold all elements found in our current view. 
     var attributesInRect = [UICollectionViewLayoutAttributes]() 

     // Check each element to see if it should be returned. 
     for cellAttributes in cellAttrsDictionary.values.elements { 
      if CGRectIntersectsRect(rect, cellAttributes.frame) { 
       attributesInRect.append(cellAttributes) 
      } 
     } 

     // Return list of elements. 
     return attributesInRect 
    } 

    override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes? { 
     return cellAttrsDictionary[indexPath]! 
    } 

    override func shouldInvalidateLayoutForBoundsChange(newBounds: CGRect) -> Bool { 
     return true 
    } 

} 

Стараюсь свойства collecionview изменения в storyboard но оленья кожа работает и я прикрепил текущие collectionview свойства объекта картина под ниже

Также я выбран масштаб 4, но зум функция не работает? Зачем ? это должна быть работа и функция увеличения.

Answer 1

Я знаю, что слишком поздно отвечать, но это может быть полезно для других пользователей.

override func viewDidLayoutSubviews() { 
    super.viewDidLayoutSubviews() 
    collectionView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 50, right: 0) 
}