ios - 尝试通过解析在 UITableView 上显示数据

Question

我正在尝试将解析的数据显示到 UITableView 上，但它只显示一个空白的 UITableView(未显示任何数据)

我在解析中有一个大学类(class)，以及一个 universityEnrolledName 列名

这是代码

import UIKit
import Parse
import ParseUI
class viewUniversityList: PFQueryTableViewController {


@IBOutlet var uiTableView: UITableView!

override init(style: UITableViewStyle, className: String!){
    super.init(style: style, className: className)
}

required init(coder aDecoder: NSCoder){
    super.init(coder: aDecoder)

    self.parseClassName = "University"
    self.textKey = "universityEnrolledName"
    self.pullToRefreshEnabled = true
    self.paginationEnabled = false

}


override func queryForTable() -> PFQuery {
    var query = PFQuery(className: "University")
    query.orderByAscending("universityEnrolledName")
    return query;
}


override func viewDidLoad() {
    super.viewDidLoad()

    uiTableView.delegate = self
    uiTableView.dataSource = self

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 0
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete method implementation.
    // Return the number of rows in the section.
    return 0
}


override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> PFTableViewCell {

    var cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! PFTableViewCell!
    if cell == nil {
        cell = PFTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
    }

    if let universityEnrolledName = object?["universityEnrolledName"] as? String{
        cell?.textLabel?.text = universityEnrolledName
    }

    if let classEnrolledName = object?["classEnrolledName"] as? String{
        cell?.detailTextLabel?.text = classEnrolledName
    }


    return cell;
}


/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return NO if you do not want the specified item to be editable.
    return true
}
*/

/*
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
    if editingStyle == .Delete {
        // Delete the row from the data source
        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
    } else if editingStyle == .Insert {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }    
}
*/

/*
// Override to support rearranging the table view.
override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {

}
*/

/*
// Override to support conditional rearranging of the table view.
override func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return NO if you do not want the item to be re-orderable.
    return true
}
*/

/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}


 */

}

有没有人对显示大学类(class)(来自 Parse)的 universityEnrolledName 数据有任何建议？谢谢!

Answer 1

这里，

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete method implementation.
    // Return the number of rows in the section.
    return 0
}

此方法用于在表格 View 中显示数字行。由于您要返回 0，这意味着您告诉 TableView 您的表应该有零行。

同理

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 0
}

默认情况下， TableView 只有一个部分，如果您明确提供一些值，它将被覆盖。

所以在这两种情况下，您都应该返回一些大于零的正数。

下面的方法应该返回 UITableViewCell，但是你写了 PFTableViewCell。所以改变它。

  override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath, object: PFObject?) -> UITableViewCell {


    var cell = tableView.dequeueReusableCellWithIdentifier("Cell") as! PFTableViewCell!
    if cell == nil {
        cell = PFTableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "Cell")
    }

    if let universityEnrolledName = object?["universityEnrolledName"] as? String{
        cell?.textLabel?.text = universityEnrolledName
    }

    if let classEnrolledName = object?["classEnrolledName"] as? String{
        cell?.detailTextLabel?.text = classEnrolledName
    }
    return cell;
}