ios - 从具有多个部分的 TableView 继续

Question

我有以下设置 tableView:

我想执行从每个单元格(如披露所示)到另一个 View Controller 的转接。问题是我不想制作六个不同的 View Controller ，特别是因为它们中的许多几乎是相同的，包含一个或两个文本字段和一个标签。有什么方法可以只制作一个 View Controller 并根据单击的单元格进行更改吗？

Answer 1

The problem is I don't want to make six different view controllers, especially since many of them will be almost identical, containing one or two text fields and a label.

这绝对是真的。您可以通过添加 仅一个 segue 来实现此目的 - 无需添加六个不同的 segues - 从设置 ViewController 到下一个(详细信息 ViewController)；根据选择的行(在哪个部分)，您可以执行 segue 并发送所需的数据。

1- 添加 Segue:

您需要添加一个从设置 ViewController 到详细信息 ViewController 的 segue。 确保 segue 已从设置 ViewController 本身连接，但不是来自任何表格 View 单元格。在 Storyboard上添加 segue 后，您需要为其添加一个标识符，我将在我的代码片段示例中将其称为“toDetails”。

如果您不知道如何为 segue 添加标识符，您可能需要查看 this answer .

2- 发送所需数据:

为了简化，我假设您要发送的数据只是一个字符串变量，在我的代码片段示例中称为 dataToSend。

过程如下:

设置 View Controller :

class SettingsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!

//...
private var dataToSend = ""
//...

//...
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    performSegue(withIdentifier: "toDetails", sender: self)
}
//...

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    // tableView should be connected as an IBOutlet
    guard let selectedIndexPath = tableView.indexPathForSelectedRow else {
        print("Something went wrong when selected a row!")
        return
    }

    if selectedIndexPath.section == 0 { // Account Section

        if selectedIndexPath.row == 0 { // Name Row
            dataToSend = "name"
        } else if selectedIndexPath.row == 1 { // School Row
            dataToSend = "school"
        } else if selectedIndexPath.row == 2 { // Grade Row
            dataToSend = "grade"
        }

    } else if selectedIndexPath.section == 1 { // Private Section

        if selectedIndexPath.row == 0 { // Email Row
            dataToSend = "email"
        } else if selectedIndexPath.row == 1 { // Password Row
            dataToSend = "password"
        } else if selectedIndexPath.row == 2 { // Phone Number Row
            dataToSend = "phone"
        }

    }

    let detailsViewController = segue.destination as! DetailsViewController
    detailsViewController.receivedData = dataToSend
    }

    //...
}

更进一步:

在处理这种情况时，使用枚举而不是检查行号是一种很好的做法，这样可以提高代码的可读性:

enum Sections:Int {
    case
    account = 0,
    privacy = 1
}

enum AccountRows:Int {
    case
    name = 0,
    school = 1,
    grade = 2
}

enum PrivacyRows:Int {
    case
    email = 0,
    password = 1,
    phone = 2
}

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
    //...
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        // tableView should be connected as an IBOutlet
        guard let selectedIndexPath = tableView.indexPathForSelectedRow else {
            print("Something went wrong when selected a row!")
            return
        }

        // tuple of (section, row)
        switch (selectedIndexPath.section, selectedIndexPath.row) {
            // Accounts Section
            case (Sections.account.rawValue, AccountRows.name.rawValue):
                dataToSend = "name"
            case (Sections.account.rawValue, AccountRows.school.rawValue):
                dataToSend = "school"
            case (Sections.account.rawValue, AccountRows.grade.rawValue):
                dataToSend = "grade"

            // Privacy Section
            case (Sections.privacy.rawValue, PrivacyRows.email.rawValue):
                dataToSend = "email"
            case (Sections.privacy.rawValue, PrivacyRows.password.rawValue):
                dataToSend = "password"
            case (Sections.privacy.rawValue, PrivacyRows.phone.rawValue):
                dataToSend = "phone"
            default:
                print("Something went wrong when checking Section and Rows!")
        }

        let detailsViewController = segue.destination as! DetailsViewController
        detailsViewController.receivedData = dataToSend
    }
    //...
}

加油!希望这对您有所帮助。