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[英]Infinite UITableView Scroll with NSFetchedResultsController
[英]Infinite scroll with UITableView and an Array
我是Swift的新手,我想用數組進行無限滾動。 這是我的ClassViewController類
class TableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var legumes: [String] = ["Eggs", "Milk", "Chocolat", "Web", "Miel", "Pop", "Eco", "Moutarde", "Mayo", "Thea", "Pomelade", "Gear", "Etc" , "Nop", "Dews", "Tout", "Fun", "Xen" , "Yoga" ]
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.legumes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! ImageTableViewCell
return cell
}
}
我想顯示我的數組的前十項,當我在TableViewController的底部時,它將加載接下來的十個項目,等等。我不知道怎么做,我在GitHub上看到很多代碼但是我不知道如何實現它們。
非常感謝。
您所描述的內容稱為pagination
。 你應該做這樣的事情:
/* Number of page you're loading contents from */
var pageIndex: Int = 1
override func scrollViewDidScroll(scrollView: UIScrollView) {
let offsetY = scrollView.contentOffset.y
let contentHeight = scrollView.contentSize.height
if offsetY > contentHeight - scrollView.frame.size.height {
/* increment page index to load new data set from */
pageIndex += 1
/* call API to load data from next page or just add dummy data to your datasource */
/* Needs to be implemented */
loadNewItemsFrom(pageIndex)
/* reload tableview with new data */
tableView.reloadData()
}
}
考慮使用PagingTableView
class MainViewController: UIViewController {
@IBOutlet weak var contentTable: PagingTableView!
var legumes: [String] = ["Eggs", "Milk", "Chocolat", "Web", "Miel", "Pop", "Eco", "Moutarde", "Mayo", "Thea", "Pomelade", "Gear", "Etc" , "Nop", "Dews", "Tout", "Fun", "Xen" , "Yoga" ]
override func viewDidLoad() {
super.viewDidLoad()
contentTable.dataSource = self
contentTable.pagingDelegate = self
}
}
extension MainViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return legumes.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! ImageTableViewCell
guard legumes.indices.contains(indexPath.row) else { return cell }
cell.content = legumes[indexPath.row]
return cell
}
}
extension MainViewController: PagingTableViewDelegate {
func paginate(_ tableView: PagingTableView, to page: Int) {
contentTable.isLoading = true
DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
self.legumes.append(contentsOf: legumes)
self.contentTable.isLoading = false
}
}
}
修改paginate函數以按您的意願工作
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