无法调用 UITableViewDataSource 方法，调试时即使光标也无法进入这些方法

Question

这是我的类，其中 UITableViewDatasource 的方法被覆盖，以便在单个单元格中使用 UITableViewCell 将数据作为“电子邮件”在代码中使用。但这些方法不会被执行。有人可以帮我解决这个问题吗？

导入 UIKit

var operationViewFlag: Int!

类 HomeCellView: UITableViewCell {

@IBOutlet weak var btn_tablecell_Delete: UIButton!
@IBOutlet weak var btn_tablecell_Edit: UIButton!
@IBOutlet weak var lbl_tablecell_Email: UILabel!

}

ViewController 类：UIViewController、UITableViewDataSource、UITableViewDelegate {

@IBOutlet weak var TableView_Mainscreen: UITableView!
@IBOutlet weak var lbl_MainScreen_Title: UILabel!
@IBOutlet weak var btn_Mainscreen_Insert: UIButton!


var databasepath:String!
var arrayStudInfo:NSMutableArray!


// viewDidLoad
override func viewDidLoad()
{

    operationViewFlag=1

    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    lbl_MainScreen_Title.font = UIFont(name: "HelveticaNeue-Bold", size: 20)
    btn_Mainscreen_Insert.layer.cornerRadius = 15
    btn_Mainscreen_Insert.layer.borderWidth = 1
    btn_Mainscreen_Insert.layer.borderColor = UIColor.brownColor().CGColor


    // Variable Intialization
    arrayStudInfo = NSMutableArray()


    // Process for Creating Opening Database
    let filemgr = NSFileManager.defaultManager()
    let dirpath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
    let docdir = dirpath[0] as String
    databasepath = docdir.stringByAppendingString("StudentDataManipulation.sqlite");

    if filemgr.fileExistsAtPath(databasepath as String)
    {
        let contactDB = FMDatabase(path: databasepath as String)
        if contactDB == nil
        {
            print("Error: \(contactDB.lastErrorMessage())")
        }
        if contactDB.open()
        {
            let sql_stmt = "CREATE TABLE IF NOT EXISTS StudentData (Name TEXT, Phone TEXT, Email TEXT PRIMARY KEY  NOT NULL, Comment TEXT)"

            if !contactDB.executeStatements(sql_stmt)
            {
                print("Error: \(contactDB.lastErrorMessage())")
            }
            contactDB.close()
        }
        else
        {
            print("Error: \(contactDB.lastErrorMessage())")
        }
    }
}

//viewWillAppear
override func viewWillAppear(animated: Bool)
{
    super.viewWillAppear(true)
    listAllData()
}

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

// Edit Method
@IBAction func btn_Edit_Clicked(sender: UIButton)
{
    operationViewFlag=2

    let updateView = self.storyboard?.instantiateViewControllerWithIdentifier("PerformOperation") as! PerformOperation
    updateView.strEmail = arrayStudInfo[sender.tag]["Email"] as? String
    print("Email to pass = \(updateView.strEmail)")
    updateView.dictRecord = (arrayStudInfo[sender.tag] as! NSDictionary)
    self.navigationController?.pushViewController(updateView, animated: true)
}


// Delete Method
@IBAction func btn_Delete_Clicked(sender: UIButton)
{

    let contactDB = FMDatabase(path: databasepath as String)
    let strDelete = arrayStudInfo[sender.tag]["Email"] as? String
    if contactDB.open()
    {
        let deleteSQL = "DELETE FROM StudentData WHERE Email='\(strDelete!)'"

        let result = contactDB.executeUpdate(deleteSQL, withArgumentsInArray: nil)
        if !result
        {
            print("Error: \(contactDB.lastErrorMessage())")
        }
        else
        {
            print("Deleted Record.")
            listAllData()
        }
    }
    else
    {
        print("Error: \(contactDB.lastErrorMessage())")
    }
    contactDB.close()
}



// List All Data
func listAllData()
{
    arrayStudInfo.removeAllObjects();
    let contactDB = FMDatabase(path: databasepath as String)
    if contactDB.open()
    {
        let filemgr = NSFileManager.defaultManager()
        let dirpath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
        let docdir = dirpath[0] as String
        databasepath = docdir.stringByAppendingString("StudentDataManipulation.sqlite");

        if filemgr.fileExistsAtPath(databasepath as String)
        {
            let contactDB = FMDatabase(path: databasepath as String)
            if contactDB == nil
            {
                print("Error: \(contactDB.lastErrorMessage())")
            }
            if contactDB.open()
            {
                let sql_stmt = "CREATE TABLE IF NOT EXISTS StudentData (Name TEXT, Phone TEXT, Email TEXT PRIMARY KEY  NOT NULL, Comment TEXT)"
                if !contactDB.executeStatements(sql_stmt)
                {
                    print("Error: \(contactDB.lastErrorMessage())")
                }
                let SelectQuery = "SELECT * FROM StudentData"
                if let results:FMResultSet? = contactDB.executeQuery(SelectQuery, withArgumentsInArray: nil)
                {
                    while results?.next() == true
                    {
                        let dictRecord = results?.resultDictionary()
                        arrayStudInfo.insertObject(dictRecord!, atIndex: arrayStudInfo.count)
                        print("\nRESULT : \(results?.resultDictionary())")
                    }
                    TableView_Mainscreen.reloadData()
                }
                else
                {
                    print("Recored not found");
                }
                contactDB.close()
            }
            else
            {
                print("Error: \(contactDB.lastErrorMessage())")
            }
        }
        contactDB.close()
    }
    else
    {
        print("Error: \(contactDB.lastErrorMessage())")
    }
}


// TableView Methods
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    return arrayStudInfo.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let Cell = tableView.dequeueReusableCellWithIdentifier("CellHome") as! HomeCellView
    Cell.lbl_tablecell_Email.text! = arrayStudInfo[(indexPath.row)]["Email"] as! String

    print("Your Email : \(Cell.lbl_tablecell_Email.text!)")

    Cell.btn_tablecell_Edit.tag=indexPath.row
    Cell.btn_tablecell_Delete.tag=indexPath.row
    Cell.btn_tablecell_Edit.layer.cornerRadius = 10
    Cell.btn_tablecell_Delete.layer.cornerRadius = 10


   // btn_Delete_Clicked
    Cell.btn_tablecell_Edit.addTarget(self, action: #selector(ViewController.btn_Edit_Clicked(_:)), forControlEvents: UIControlEvents.TouchUpInside)

    Cell.btn_tablecell_Delete.addTarget(self, action: #selector(ViewController.btn_Delete_Clicked(_:)), forControlEvents: UIControlEvents.TouchUpInside)

    return Cell
}

}

Answer 1

您是否将委托和数据源设置为 ViewController。

如果您使用情节提要，您可以控制点击您的 tableView 到 ViewController 并设置委托和数据源。

如果你想在代码中这样做，你可以这样做

TableView_Mainscreen.delegate = self
TableView_Mainscreen.datasource = self

此外，您应该使用小写字母来命名您的变量。