我有成功的工作tableview与json解析代码.但可能有1000多个项目,所以需要分页时滚动底面.我不知道我如何在下面这样做我的代码.对于Objective-C有很多例子,但是对于
swift我没有找到工作示例.我等待你的帮助我想会帮助太多的人.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()
- }
- }
解决方法
因此,您还需要更改服务器端.
>服务器将接受来自InDex和batchSize的API url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,会有一个额外的key totalItems.这将用于识别所有收到的项目.数组或项从fromdex到batchSize的项数.
在应用程式方面
>首先使用fromIndex = 0和batchSize = 20调用loadItem()(例如在viewDidLoad()或viewWillAppear中).在首次调用loadItem()之前,先从privateList数组中删除所有项目
>服务器返回服务器中前20个项目和totalItems项目总数的数组.
>在privateList数组中追加20个项目并重新加载tableView
>在tableView中:cellForRowAtIndexPath方法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.这意味着要加载的服务器中有更多的项目
- if indexPath.row == privateList.count - 1 { // last cell
- if totalItems > privateList.count { // more items to fetch
- loadItem() // increment `fromIndex` by 20 before server call
- }
- }
问题在哪里刷新?会滚动吗?
当收到服务器响应时,在数组中附加新项目后刷新. (步骤3)
滚动将在用户滚动时触发tableView:cellForRowAtIndexPath为每个单元格.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. (步骤4)