ios - 从父 ViewController 更改嵌入式 UITableViewController 数据

Question

我试图让用户按下顶部的其中一个名称。完成后，子 TableViewController 将更改一个 bool 值 currentUserIsLoggedInUser。

在我的 FactsController 中我有代码:

class FactsController: UIViewController {

    @IBOutlet weak var currentUserName: UIButton!
    @IBOutlet weak var friendUserName: UIButton!

    var currentPersonSelectedIsCurrentUser: Bool = false

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if (segue.identifier == "ChangePersonSegue") {

            let embed: FactsTableViewController = segue.destinationViewController as! FactsTableViewController
            embed.currentPersonSelectedIsCurrentUser = self.currentPersonSelectedIsCurrentUser
            embed.refresh //this doesn't call the function like id want it to
        }
    }

    func changeFactList() {
        //segue for table view controller for ___
        // call prepareForSegue
        performSegueWithIdentifier("ChangePersonSegue", sender: self)
    }

    override func viewDidLoad() {
        //changethings(user)
    }

    @IBAction func tappedUserName (sender: UIButton) {
        if currentPersonSelectedIsCurrentUser {

        }
        else {
            currentPersonSelectedIsCurrentUser = true
            changeFactList()
            currentUserName.titleLabel?.textColor = UIColor.lightGrayColor()
            friendUserName.titleLabel?.textColor = UIColor.darkGrayColor()
        }
    }

    @IBAction func tappedFriendName (sender: UIButton) {
        if currentPersonSelectedIsCurrentUser {
            currentPersonSelectedIsCurrentUser = false
            changeFactList()
            // change text color
            currentUserName.titleLabel?.textColor = UIColor.darkGrayColor()
            friendUserName.titleLabel?.textColor = UIColor.lightGrayColor()
        }
        else {

        }
    }
}

然后在我的 FactsTableViewController 中我有代码:

class FactsTableViewController: UITableViewController {

    let cellID = "factCell"

    var currentUserIsLoggedInUser: Bool = false

    //var currentUserName: String = ""
    var facts = [Fact]()
    var currentUser: User!
    var soUser: User!

    let ref: FIRDatabaseReference = FIRDatabase.database().reference()

    override func viewDidLoad() {
        if currentUserIsLoggedInUser {
            // make tableview for the current user
        }
        else {
            // make tableview for the friend         
        }
    }

    func refresh() {
        self.tableView.reloadData()
    }

}

如果有一种方法可以在按下按钮时从 FactsController 发送一个 bool 值，那将使一切变得容易得多。

Answer 1

如果你想:

a way to just send from the FactsController a boolean when a button is pressed

然后你需要一个代表。不过， Storyboard 并不能使您对这种情况有太多控制。我会将您的 UI 移动到 nib 文件中，并手动添加 FactsTableViewController 作为子 VC。拥有这些类的实例，您可以更轻松地管理委托(delegate)。