Question

我创建了一个UISplitViewController：

class EmployeesSplitViewController: UISplitViewController {

 override func viewDidLoad() {
    super.viewDidLoad()
    let nav1 = UINavigationController()
    let nav2 = UINavigationController()

    let masterViewController = EmployeesList()
    let detailViewController = EmployeeDetailsTableViewController()
    nav1.viewControllers = [detailViewController]
    nav2.viewControllers = [masterViewController]
    detailViewController.view.backgroundColor = .white
    self.viewControllers = [nav2, nav1]
    self.maximumPrimaryColumnWidth = self.view.frame.width / 3
    self.preferredDisplayMode = .allVisible
 }

}

<{1>} EmployeeDetailsTableViewController我有一个自定义提醒视图，在coreData中添加新员工，然后我想在reloadData中调用EmployeesList。我使用了爆燃模式：

protocol EmployeeDetailsTableViewControllerDelegate {
func refreshTable()
}

然后在EmployeeDetailsTableViewController

var delegate:EmployeeDetailsTableViewControllerDelegate?


func addButtonTapped(name: String, lastName: String, jobTitle: String) {

    let coreManager =  CoreDataManager()
    coreManager.addNewEmployee(name: name, lastName: lastName, jobTitle: jobTitle)
    alertView.removeFromSuperview()
    blurEffectView.removeFromSuperview()
    delegate?.refreshTable() //this is the delegate method
}

EmployeesList

中的

class EmployeesList: UITableViewController, NSFetchedResultsControllerDelegate, EmployeeDetailsTableViewControllerDelegate {

   let employeeDetailsVC = EmployeeDetailsTableViewController()

   override func viewDidLoad() {
      super.viewDidLoad()
      employeeDetailsVC.delegate = self
   }

   func refreshTable() {
    print("RELOADING") //this never get called
    self.tableView.reloadData()
   }

}

refreshTable永远不会被调用。我错过了什么？

更新：正如Phillip Mills正确指出的那样，我将委托分配给了错误的对象。我设法调用委托函数在masterViewController上设置委托。现在唯一的问题是我还需要masterViewController来调用masterViewController.tableView.reloadData（）。如果我将其移到viewDidLoad之外，我会收到以下错误：'NSGenericException', reason: 'The content view controller argument must be the root of its associated view controller hierarchy.'

class EmployeesSplitViewController: UISplitViewController, EmployeeDetailsTableViewControllerDelegate {

    var masterViewController:EmployeesList!

    override func viewDidLoad() {
        super.viewDidLoad()
        let nav1 = UINavigationController()
        let nav2 = UINavigationController()

        masterViewController = EmployeesList()
        let detailViewController = EmployeeDetailsTableViewController()
        detailViewController.delegate = self
        nav1.viewControllers = [detailViewController]
        nav2.viewControllers = [masterViewController]
        detailViewController.view.backgroundColor = .white
        self.viewControllers = [nav2, nav1]
        self.maximumPrimaryColumnWidth = self.view.frame.width / 3
        self.preferredDisplayMode = .allVisible
    }

    func refreshTable() {
        masterViewController.tableView.reloadData()
    }

}

Answer 1

这两行...

let detailViewController = EmployeeDetailsTableViewController()

...和...

let employeeDetailsVC = EmployeeDetailsTableViewController()

...每个都创建一个对象。也就是说，每个都创建一个不同的对象。

您指向detailViewController的那个用于在屏幕上显示内容，但它是另一个分配了该代表的内容。

不要在EmployeesList中创建第二个控制器，而是将masterViewController设置为原始 EmployeeDetailsTableViewController对象的代理。

在UISplitViewController中未调用Delegate方法

1 个答案: