一尘不染

Swift tableView分页

swift

我可以使用json解析代码成功工作tableview。但是可能还有1000多个项目,因此在滚动底部时需要分页。我不知道如何在下面执行我的代码。对于Objective-C,有很多例子,但是为了迅速,我没有找到有效的例子。我在等你的帮助。我认为会帮助太多人。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("Hayır"){ }
            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()
    }


}

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2020-07-07

共1个答案

一尘不染

为此,您还需要更改服务器端。

  1. 服务器将接受fromIndexbatchSizeAPIurl中作为查询参数。

    let listUrlString =  "http://bla.com/json2.php?listType=" + listType + "&t=" + NSUUID().UUIDString + "&batchSize=" + batchSize + "&fromIndex=" + fromIndex
    
  2. 在服务器响应中,将有一个额外的密钥totalItems。这将用于识别是否已收到所有项目。阵列或项目fromIndexbatchSize项目数。

在应用程序方面

  1. 首先loadItem()将用fromIndex = 0和调用batchSize = 20(例如,在viewDidLoad()或中viewWillAppear)。第一次privateList调用之前从数组中删除所有项目loadItem()

  2. 服务器返回服务器中前20个项目和项目totalItems总数的数组。

  3. 追加privateList数组中的20个项目并重新加载tableView

  4. tableView:cellForRowAtIndexPath方法中,检查该单元格是否为最后一个单元格。并检查totalItems(表单服务器)是否大于privateList.count。这意味着服务器中还有更多项目要加载

    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,在数组中添加新项目后刷新。(第3步)

tableView:cellForRowAtIndexPath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的项目。(第4步)

添加了示例项目:https :
//github.com/rishi420/TableViewPaging

2020-07-07