如何重新加载 table 视图? Xcode 11

How can I reload a table view? Xcode 11

我目前正在尝试向tableView中添加一行,我添加视图的代码如下

     @IBAction func done(segue:UIStoryboardSegue) {
        let newContact = segue.source as! NewContactViewController
        FirstName = newContact.firstName
        LastName = newContact.lastName
           print("Adding the name: " + FirstName + " " + LastName + " to the nameArry")
        nameArry.append(FirstName + " " + LastName)
        print("Added " + nameArry[nameArry.count - 1] + " to name array")
        
        let indexPath = IndexPath(row: myContact.count + contacts.count - 1, section: 0) // Set the indexPath to the lowest part of the array
        
        tableView.beginUpdates() // Starts the update
        tableView.insertRows(at: [indexPath], with: .automatic) // Insert row at the lowest part of the table
        tableView.endUpdates() // Ends the update
        
        newContact.firstName = "" // Clears the variable "firstName"
        newContact.lastName = "" // Clears the variable "lastName"
        view.endEditing(true) // Disables Editing, saw it on youtube.
    }

我使用 myContact.count + contacts.count 作为 indexPath,因为那是我在 tableView 上使用的

    // Get Number of items in table
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return (myContact.count + contacts.count)
    }

我收到以下错误:

Thread 1: Exception: "attempt to insert row 4 into section 0, but there are only 4 rows in section 0 after the update" 

你为什么要删除一个?

let indexPath = IndexPath(row: myContact.count + contacts.count - 1, section: 0) 

.....写这一行不减1这样...

let indexPath = IndexPath(row: myContact.count + contacts.count , section: 0)

因为如果您要添加一行并从总数中减去它...那么更新后现有部分中包含的行数等于更新前该部分中包含的行数

我明白了,我没有得到准确的计数,因为我没有向联系人数组附加任何内容。

contacts.append(Contacts(MyContact: nameArry[nameArry.count - 1], Me: ""))

let indexPath = IndexPath(row: myContact.count + contacts.count - 1, section: 0)