Swi*_*per 47 pagination uitableview ios swift
我用json解析代码成功地工作tableview.但是可能还有1000个项目,因此在滚动底部时需要分页.我不知道我怎么能在下面做我的代码.对于objective-c有很多例子但是对于swift我没有找到工作的例子.我在等你的帮助.我想会帮助太多人.谢谢 !
import UIKit
class ViewController: UIViewController, UITableViewDataSource,UITableViewDelegate {
let kSuccessTitle = "Congratulations"
let kErrorTitle = "Connection error"
let kNoticeTitle = "Notice"
let kWarningTitle = "Warning"
let kInfoTitle = "Info"
let kSubtitle = "You've just displayed this awesome Pop Up View"
@IBOutlet weak var myTableView: UITableView!
@IBOutlet weak var myActivityIndicator: UIActivityIndicatorView!
var privateList = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
loadItems()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
internal func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return privateList.count
}
internal func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
let cell:myCell = tableView.dequeueReusableCellWithIdentifier("myCell") as! myCell
cell.titleLabel.text = privateList[indexPath.row]
return cell
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if (editingStyle == UITableViewCellEditingStyle.Delete){
print(indexPath.row)
let alert = SCLAlertView()
alert.addButton("Hay?r"){ }
alert.addButton("Evet") {
self.myTableView.beginUpdates()
self.privateList.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Left)
print("Silindi")
self.myTableView.endUpdates()
self.loadItems()
}
alert.showSuccess(kSuccessTitle, subTitle: kSubtitle)
}
}
func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// the cells you would like the actions to appear needs to be editable
return true
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if(segue.identifier == "Detail") {
let destinationView = segue.destinationViewController as! DetailViewController
if let indexPath = myTableView.indexPathForCell(sender as! UITableViewCell) {
destinationView.privateLista = privateList[indexPath.row]
}
}
}
internal func tableView(tableView: UITableView, estimatedHeightForHeaderInSection section: Int) -> CGFloat
{
return 0.0
}
func loadItems()
{
loadItemsNow("privateList")
}
func loadItemsNow(listType:String){
myActivityIndicator.startAnimating()
let listUrlString = "http://bla.com/json2.php?listType=" + listType + "&t=" + NSUUID().UUIDString
let myUrl = NSURL(string: listUrlString);
let request = NSMutableURLRequest(URL:myUrl!);
request.HTTPMethod = "GET";
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
if error != nil {
print(error!.localizedDescription)
dispatch_async(dispatch_get_main_queue(),{
self.myActivityIndicator.stopAnimating()
})
return
}
do {
let json = try NSJSONSerialization.JSONObjectWithData(data!, options: .MutableContainers) as? NSArray
if let parseJSON = json {
self.privateList = parseJSON as! [String]
}
} catch {
print(error)
}
dispatch_async(dispatch_get_main_queue(),{
self.myActivityIndicator.stopAnimating()
self.myTableView.reloadData()
})
}
task.resume()
}
}
War*_*shi 56
为此,您还需要进行服务器端更改.
服务器将接受fromIndex并batchSize在APIurl中作为查询参数.
let listUrlString = "http://bla.com/json2.php?listType=" + listType + "&t=" + NSUUID().UUIDString + "&batchSize=" + batchSize + "&fromIndex=" + fromIndex
在服务器响应中,将有一个额外的密钥totalItems.这将用于识别是否收到所有项目.阵列或项目fromIndex到batchSize项目数.
在应用程序方面
首先loadItem()将使用fromIndex = 0和batchSize = 20(例如in viewDidLoad()或viewWillAppear)调用.在第一次privateList调用之前从数组中删除所有项目loadItem()
服务器返回前20个项目的数组和totalItems服务器中的项目总数.
在privateList数组中追加20个项目并重新加载tableView
在tableView:cellForRowAtIndexPath方法中检查单元格是否是最后一个单元格.并检查totalItems(表单服务器)是否大于privateList.count.这意味着服务器中有更多项目要加载
if indexPath.row == privateList.count - 1 { // last cell
if totalItems > privateList.count { // more items to fetch
loadItem() // increment `fromIndex` by 20 before server call
}
}
题: where is refresh ? will be scrolling ?
收到服务器响应后,在数组中追加新项目后刷新.(第3步)
tableView:cellForRowAtIndexPath当用户滚动时,滚动将触发每个单元格.代码正在检查它是否是最后一个单元格并获取剩余项目.(第4步)
添加了示例项目:https:
//github.com/rishi420/TableViewPaging
Mah*_*iri 14
做的好和有效的方法是使用scrollviewDelegate在tableview中只需添加UIScrollViewDelegate在您viewController
在视图控制器
//For Pagination
var isDataLoading:Bool=false
var pageNo:Int=0
var limit:Int=20
var offset:Int=0 //pageNo*limit
var didEndReached:Bool=false
viewDidLoad(_){
tableview.delegate=self //To enable scrollviewdelegate
}
覆盖此委托中的两个方法
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
print("scrollViewWillBeginDragging")
isDataLoading = false
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
print("scrollViewDidEndDecelerating")
}
//Pagination
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
print("scrollViewDidEndDragging")
if ((tableView.contentOffset.y + tableView.frame.size.height) >= tableView.contentSize.height)
{
if !isDataLoading{
isDataLoading = true
self.pageNo=self.pageNo+1
self.limit=self.limit+10
self.offset=self.limit * self.pageNo
loadCallLogData(offset: self.offset, limit: self.limit)
}
}
}
Mhm*_*izk 12
SWIFT 3.0 - 4 ......
如果您要在API请求中发送页码,那么这是在您的应用中实施分页的理想方式.
1)声明具有初始值0的变量current Page和bool,以检查是否正在加载任何列表,初始值为false
var currentPage : Int = 0
var isLoadingList : Bool = false
2)这是获取列表示例的函数:
func getListFromServer(_ pageNumber: Int){
self.isloadingList = false
self.table.reloadData()
}
3)这是增加页码并调用API函数的函数
func loadMoreItemsForList(){
currentPage += 1
getListFromServer(currentPage)
}
4)这是scrollView滚动时将调用的方法
func scrollViewDidScroll(_ scrollView: UIScrollView) {
if (((scrollView.contentOffset.y + scrollView.frame.size.height) > scrollView.contentSize.height ) && ! isLoadingList){
self. isLoadingList = true
self. loadMoreItemsForList()
}
}
PS bool isLoadingList的作用是防止滚动视图在一次拖动中获取更多列表到表视图的底部.
Pau*_*son 10
在iOS10中添加新协议现在更容易一些: UITableViewDataSourcePrefetching
https://developer.apple.com/documentation/uikit/uitableviewdatasourceprefetching
小智 6
//It works fine
func getPageCount(TotalCount : Int) -> Int{
var num = TotalCount
let reminder = num % 50
print(reminder)
if reminder != 0{
num = TotalCount/50
num = num + 1
}else{
num = TotalCount/50
}
return num
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let TotalPage = self.getPageCount(TotalCount: Int(Datacount)!)
let lastItem = self.mainArr.count - 1
if indexPath.row == lastItem {
print("IndexRow\(indexPath.row)")
if self.page < TotalPage-1 {
self.view_Loader.isHidden = false
self.view_LoaderHeight.constant = 50
self.page += 1
self.YourAPI()
}
}
}`
通过使用UITableViewDelegate，您可以调用该函数
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
let lastItem = self.mes.count - 1
if indexPath.row == lastItem {
print("IndexRow\(indexPath.row)")
if currentPage < totalPage {
currentPage += 1
//Get data from Server
}
}
}
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