我已经使用UICollectionView创建了数据表视图。
这是代码:
class PanelViewController: UIViewController{
var TableHeaderArray = NSMutableArray()
var TableDataArray = NSMutableArray()
var NumberOfRows = Int()
var UlockDataArray = NSMutableArray()
let dataSource = DataSource()
override func viewDidLoad() {
super.viewDidLoad()
dataSource.populateData()
let noOfRows = dataSource.NumberOfRows
self.NumberOfRows = noOfRows + 1
self.UlockDataArray = dataSource.DUDataArray
self.TableDataArray = dataSource.DTableDataArray
let layout: CustomCollectionViewLayout = CustomCollectionViewLayout()
DataTableCollectionView = UICollectionView(frame: CGRect(x:0, y:0, width:self.TableVu.bounds.width, height:self.TableVu.bounds.height), collectionViewLayout: layout)
DataTableCollectionView.dataSource = self
DataTableCollectionView.delegate = self
self.DataTableCollectionView .registerNib(UINib(nibName: "FixedCellIdentifier", bundle: nil),
forCellWithReuseIdentifier: FixedCellIdentifier)
self.DataTableCollectionView .registerNib(UINib(nibName: "DynamoCellIdentifier", bundle: nil),
forCellWithReuseIdentifier: DynamoCellIdentifier)
self.TableVu.addSubview(DataTableCollectionView)
self.view.addSubview(TableVu)
}
}
extension PanelViewController : UICollectionViewDataSource, UICollectionViewDelegate{
func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int{
return self.NumberOfRows
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return dataSource.TableHeaders.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
// My Code to Create Cells using data from TableHeaderArray, TableDataArray and UlockDataArray
}
func scrollViewDidScroll(scrollView: UIScrollView) {
let offsetY = scrollView.contentOffset.y
let contentHeight = scrollView.contentSize.height
var returnUmidData = NSMutableArray()
var returnTableData = NSMutableArray()
if offsetY > contentHeight - scrollView.frame.size.height {
self.dataSource.populateData()
returnUData = self.dataSource.DUDataArray
returnTableData = self.dataSource.DTableDataArray
let seconds = 5.0
let delay = seconds * Double(NSEC_PER_SEC)
let dispatchTime = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(dispatchTime, dispatch_get_main_queue(), {
self.NumberOfRows += returnTableData.count
let mergetWorkoutData = NSMutableArray(array: self.UlockDataArray)
mergetWorkoutData.addObjectsFromArray(returnUmidData as [AnyObject])
self.UlockDataArray = mergetWorkoutData
let mergetWorkoutTabelData = NSMutableArray(array: self.TableDataArray)
mergetWorkoutTabelData.addObjectsFromArray(returnTableData as [AnyObject])
self.TableDataArray = mergetWorkoutTabelData
self.DataTableCollectionView!.reloadData()
})
}
}
}
最初，我将显示前50条记录。我需要在垂直滚动上实现分页。
每次用户到达滚动结尾时，我都希望进行API调用以获取下50条记录。
但是这样做时出现错误
"Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]:
index 51 beyond bounds [0 .. 50]'"
我认为indexPath不会以某种方式更新，但无法理解在何处，为什么或如何更新它。你能给些建议么？
最佳答案
为什么不使用collectionView的willDisplayCell方法，该方法更易于管理。
func collectionView(_ collectionView: UICollectionView,
willDisplay cell: UICollectionViewCell,
forItemAt indexPath: IndexPath) {
if indexPath.row + 1 == dataSource.count && dataSource.count < myPaginationUpperLimit {
paginateMore()
}
}
关于ios - UICollectionView的分页，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/40374928/