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

Posted 2023-03-11

【中文标题】无法调用 UITableViewDataSource 方法，调试时即使光标也无法进入这些方法

【英文标题】：UITableViewDataSource Method can not be called, Even cursor doesn't get inside those methods on debugging

【发布时间】：2016-07-30 07:43:46

【问题描述】：

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

【问题讨论】：

找不到任何行设置dataSource of TableView_Mainscreen。

非常感谢，一切顺利......！

【参考方案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。