CustomCollectionViewLayout
을 구현하기 위해 GitHub source을 따르고 있지만 셀 사이에 공백을 추가 할 때 발생하지만 minimumLineSpacingForSectionAtIndex
같은 기능과 가장자리 인세 트 설정 기능은 대리인을 호출하지 않는 경우에도 설정됩니다. 제 1 열 다음에 15 칸이 필요하고 다른 열 뒤에 10 칸이 필요하기 때문에 어떻게 각 열 사이에 공백을 둘 수 있는지 알려주십시오.Swift CollectionView 사용자 지정 레이아웃 셀 간격
이 내가 지금까지 달성 한 것입니다 :
class DemoGraphicCollectionViewLayout: UICollectionViewLayout {
var numberOfColumns : Int = 0
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
numberOfColumns = (collectionView?.numberOfSections)!
for section in 0..<self.collectionView!.numberOfSections {
let sectionAttributes = NSMutableArray()
for index in 0..<numberOfColumns {
var 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 {
itemSize = CGSize(width: 150, height: 30)
}
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
frame.size.height = 30
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: CGFloat(0))
}
override var collectionViewContentSize : CGSize {
return self.contentSize
}
override func layoutAttributesForItem(at indexPath: IndexPath) -> UICollectionViewLayoutAttributes {
let aa = self.itemAttributes[indexPath.section] as! NSMutableArray
return aa[indexPath.row] as! UICollectionViewLayoutAttributes
}
override func layoutAttributesForElements(in rect: CGRect) ->[UICollectionViewLayoutAttributes]? {
var attributes = [UICollectionViewLayoutAttributes]()
if let itemAttributes = self.itemAttributes as NSArray as? [[UICollectionViewLayoutAttributes]] {
for section in itemAttributes {
let filteredArray = section.filter {evaluatedObject in
return rect.intersects(evaluatedObject.frame)
}
attributes.append(contentsOf: filteredArray)
}
}
return attributes
}
override func shouldInvalidateLayout(forBoundsChange newBounds: CGRect) -> Bool {
return true
}
func sizeForItemWithColumnIndex(_ columnIndex: Int) -> CGSize {
return CGSize(width: 150, height: 130)
}
func calculateItemsSize() {
self.itemsSize = NSMutableArray(capacity: (collectionView?.numberOfSections)!)
for index in 0..<(collectionView?.numberOfSections)! {
self.itemsSize.add(NSValue(cgSize: self.sizeForItemWithColumnIndex(index)))
}
}
}
응답하지 않고 투표를하는 이유가 있습니까? –
이 문제가 해결 되었습니까? –