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我有我的UICollectionView以下UICollectionViewLayout。在UICollectionView滾動分頁
class CustomCollectionViewLayout: UICollectionViewLayout {
var numberOfColumns = 8
var itemAttributes : NSMutableArray!
var itemsSize : NSMutableArray!
var contentSize : CGSize!
override func prepareLayout() {
if self.collectionView?.numberOfSections() == 0 {
return
}
if (self.itemAttributes != nil && self.itemAttributes.count > 0) {
for section in 0..<self.collectionView!.numberOfSections() {
var numberOfItems : Int = self.collectionView!.numberOfItemsInSection(section)
for index in 0..<numberOfItems {
if section != 0 && index != 0 {
continue
}
var attributes : UICollectionViewLayoutAttributes = self.layoutAttributesForItemAtIndexPath(NSIndexPath(forItem: index, inSection: 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() {
var sectionAttributes = NSMutableArray()
for index in 0..<numberOfColumns {
var itemSize = self.itemsSize[index].CGSizeValue()
var indexPath = NSIndexPath(forItem: index, inSection: section)
var attributes = UICollectionViewLayoutAttributes(forCellWithIndexPath: indexPath)
attributes.frame = CGRectIntegral(CGRectMake(xOffset, yOffset, itemSize.width, itemSize.height+20))
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.addObject(attributes)
xOffset += itemSize.width
column++
if column == numberOfColumns {
if xOffset > contentWidth {
contentWidth = xOffset
}
column = 0
xOffset = 0
yOffset += itemSize.height+20
}
}
if (self.itemAttributes == nil) {
self.itemAttributes = NSMutableArray(capacity: self.collectionView!.numberOfSections())
}
self.itemAttributes .addObject(sectionAttributes)
}
var attributes : UICollectionViewLayoutAttributes = self.itemAttributes.lastObject?.lastObject as! UICollectionViewLayoutAttributes
contentHeight = attributes.frame.origin.y + attributes.frame.size.height
self.contentSize = CGSizeMake(contentWidth+150, contentHeight)
}
override func collectionViewContentSize() -> CGSize {
return self.contentSize
}
override func layoutAttributesForItemAtIndexPath(indexPath: NSIndexPath) -> UICollectionViewLayoutAttributes! {
let BondData:NSArray = self.itemAttributes[indexPath.section] as! NSArray
return BondData[indexPath.row] as! UICollectionViewLayoutAttributes
}
override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
var attributes = [UICollectionViewLayoutAttributes]()
if self.itemAttributes != nil {
for section in self.itemAttributes {
let filteredArray = section.filteredArrayUsingPredicate(
NSPredicate(block: { (evaluatedObject, bindings) -> Bool in
return CGRectIntersectsRect(rect, evaluatedObject!.frame)
})
) as! [UICollectionViewLayoutAttributes]
attributes.appendContentsOf(filteredArray)
}
}
return attributes
}
override func shouldInvalidateLayoutForBoundsChange(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"
case 7:
text = "Col 7"
default:
text = "Col 8"
}
let size : CGSize = (text as NSString).sizeWithAttributes([NSFontAttributeName: UIFont.systemFontOfSize(17.0)])
let width : CGFloat = size.width + 80
return CGSizeMake(width, 30)
}
func calculateItemsSize() {
self.itemsSize = NSMutableArray(capacity: numberOfColumns)
for index in 0..<numberOfColumns {
self.itemsSize.addObject(NSValue(CGSize: self.sizeForItemWithColumnIndex(index)))
}
}
我嘗試使用下面的代碼來實現UICollectionView上滾動分頁：
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let seconds = 7.0
let delay = seconds * Double(NSEC_PER_SEC)
let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(dispatchTime, dispatch_get_main_queue(), {
self.loadMore()
self.DataTableCollectionView.reloadData()
})
}
但在這樣通過上面的代碼中，我得到一個錯誤「終止，由於應用程序未捕獲的異常'NSRangeException'，原因：'*** - [__ NSArrayM objectAtIndex：]：index 50超越界限[0..49]'「
我正在使用以下代碼來創建e桌子使用UICollectionView https://github.com/brightec/CustomCollectionViewLayout
我該如何得到這個權利？提前致謝！