ios - 在 uitableview 单元格中执行操作按钮以执行删除功能

Question

我有一个表格 View ，在每个单元格中我都有用于删除特定单元格的 X 按钮。所以我已经完成了按钮的 iboutlet 到我的自定义表格 View 单元格。在索引路径的单元格行中，我已经将目标添加到我的按钮。但是当我在我的表格 View 单元格中按下我的按钮时。应用程序崩溃。如果我把断点。它显示在目标添加的代码行中。

这里是我的代码:

func followButton(sender: AnyObject) {


        if let button = sender as? UIButton {
            print("Button Clicked: \(button.tag)")
            let item = Addtocartdata[button.tag]
            print("name: \(item.cartid!)")

            let headers = [
                "cache-control": "no-cache",
                "postman-token": "4c933910-0da0-b199-257b-28fb0b5a89ec"
            ]

            let jsonObj:Dictionary<String, Any> = [
                "cartID" : "\(item.cartid!)",
                "cartType" : "3"
            ]


            if (!JSONSerialization.isValidJSONObject(jsonObj)) {
                print("is not a valid json object")
                return
            }

            if let postData = try? JSONSerialization.data(withJSONObject: jsonObj, options: JSONSerialization.WritingOptions.prettyPrinted) {
                let request = NSMutableURLRequest(url: NSURL(string: "http://exp.Cart.php")! as URL,
                                                  cachePolicy: .useProtocolCachePolicy,timeoutInterval: 10.0)
                request.httpMethod = "POST"
                request.allHTTPHeaderFields = headers
                request.httpBody = postData

                let session = URLSession.shared
                let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
                    if (error != nil) {
                        ///print(error)
                    } else {

                        DispatchQueue.main.async(execute: {

                            if let json = (try? JSONSerialization.jsonObject(with: data!, options: [])) as? Dictionary<String,AnyObject>
                            {
                                let status = json["status"] as? Int;

                                if(status == 1)
                                {

                                    // self.tableView.reloadData()
                                    print("items deleted")
                                    self.tableView.reloadData()


                                }

                            }
                        })
                    }
                })

                dataTask.resume()
            }


        }

    }

Answer 1

在Swift 3中，action的参数是一个选择器，语法是#selector(method-signature)。所以最终的代码是:

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cartcel", for: indexPath) as! cartTableViewCell
    cell.deleteButton.tag = indexPath.row;
    cell.deleteButton.addTarget(self, action: #selector(followButton(sender:)), for: .touchUpInside)

    return cell;
}

对于您的附加问题:

I need to get the value of each cell and i need to pass as a parameter to one api call. So if it does not mach. Then how can i do the selector. To perform the delete functionality

func followButton(sender: AnyObject) {
    if let button = sender as? UIButton {
        print("Button Clicked: \(button.tag)")
        let item = Addtocartdata[button.tag]
        print("name: \(item.cartproName), quality: \(item.proqty), price: \(item.cartproPrice)")
    }
}