快速调试：我在 cod 中没有发现错误

Posted 2023-03-12

【中文标题】快速调试：我在 cod 中没有发现错误

【英文标题】：debug in swift: I not find error in cod

【发布时间】：2016-08-02 08:31:35

【问题描述】：

--------- 错误是：2016-07-31 11:16:36.116 t6_TableDemo[900:25064] -[UIView tableView:numberOfRowsInSection:]: 无法识别的选择器发送到实例 0x7feaa273c520 2016-07 -31 11:16:36.326 t6_TableDemo[900:25064] * 由于未捕获的异常而终止应用程序 'NSInvalidArgumentException'，原因：'-[UIView tableView:numberOfRowsInSection:]: 无法识别的选择器发送到 实例 0x7feaa273c520' * 首先抛出调用栈：(

---

代码是：

//

//  ViewController.swift

//  t6_TableDemo

//

//  Created by dvd shd on 7/29/16.

//  Copyright © 2016 zohur. All rights reserved.

//


import UIKit


class ViewController: UIViewController,UITableViewDataSource 


    let devcourses=[("ios App","simon All" ),("ios 8","Biotifull"),("Win 7"," it is good"), ("Windows 8","is a bad"), ("Linux 7","is better"), ("ios 9","verry very Good"),("Xcode 7","it is better")]



    let webcourses=[("rghamsar","akhavan" ),("azmadar","bakhshali"),("rezapedar","shokrollahzadeh"), ("mohammadhoseinfarzand","shokrollahzadeh"), ("zhkhahar","shokrollahzadeh"), ("pakhahar","shokrollahzadeh"),("khodam","it is better")]






    func numberOfSectionsInTableView(tableView: UITableView) -> Int 

        return 2

    



    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 





        if section == 0 

            return devcourses.count

         else

        

            return webcourses.count

        



    



    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 

        var cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)as UITableViewCell









        if indexPath.section == 0 

             let (courseTitle,courseAuthor)=devcourses[indexPath.row]

             cell.textLabel?.text=courseTitle

            cell.detailTextLabel?.text = courseAuthor





        

        else 

            let (courseTitle,courseAuthor)=webcourses[indexPath.row]

            cell.textLabel?.text=courseAuthor

            cell.detailTextLabel?.text=courseTitle

        

       // Retrieve in image

        var myImage = UIImage(named: "CellIcon")

        cell.imageView?.image=myImage



        return cell

    





    func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? 

        if section == 0 

            return "Developer Courses"

          else

        

            return "Web Courses"

        

    







    override func viewDidLoad() 

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

    


    override func didReceiveMemoryWarning() 

        super.didReceiveMemoryWarning()

        // Dispose of any resources that can be recreated.

    

【参考方案1】：

您在项目中遗漏了 2 件事。

1：为您的tableView 创建一个@IBOutlet。

2：在您的viewDidLoad 方法中符合其dataSource，您的结果将是：

完整的代码是：

import UIKit

class ViewController: UIViewController,UITableViewDataSource 


    let devcourses=[("ios App","simon All" ),("ios 8","Biotifull"),("Win 7"," it is good"), ("Windows 8","is a bad"), ("Linux 7","is better"), ("ios 9","verry very Good"),("Xcode 7","it is better")]

    let webcourses=[("rghamsar","akhavan" ),("azmadar","bakhshali"),("rezapedar","shokrollahzadeh"), ("mohammadhoseinfarzand","shokrollahzadeh"), ("zhkhahar","shokrollahzadeh"), ("pakhahar","shokrollahzadeh"),("khodam","it is better")]

    @IBOutlet weak var tblView: UITableView!

    override func viewDidLoad() 

        super.viewDidLoad()

        tblView.dataSource = self
    

    func numberOfSectionsInTableView(tableView: UITableView) -> Int 

        return 2

    

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int 

        if section == 0 

            return devcourses.count

         else 

            return webcourses.count

        
    

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell 

        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)as UITableViewCell

        if indexPath.section == 0 

            let (courseTitle,courseAuthor)=devcourses[indexPath.row]

            cell.textLabel?.text=courseTitle

            cell.detailTextLabel?.text = courseAuthor

        

        else 

            let (courseTitle,courseAuthor)=webcourses[indexPath.row]

            cell.textLabel?.text=courseAuthor

            cell.detailTextLabel?.text=courseTitle

        

        // Retrieve in image

        let myImage = UIImage(named: "CellIcon")

        cell.imageView?.image=myImage

        return cell

    

    func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? 

        if section == 0 

            return "Developer Courses"

         else 

            return "Web Courses"

        
    

查看Demo Project了解更多信息。