Viewdidappear不打電話時，從子視圖

Question

回報，我知道這是一個僞問題，但我不知道是什麼問題。我有兩個viewcontrollers，其中之一是作爲彈出窗口打開。當我點擊彈出窗口中的關閉按鈕時，我將調用unwind segue，但viewdidappear函數不會在我的父視圖控制器中調用。 我從這篇文章得到了幫助。 Unwound by a child

override func viewDidAppear(_ animated: Bool) 
{ 
    // Handle controller being exposed from push/present or pop/dismiss 
    if (self.isMovingToParentViewController || self.isBeingPresented){ 
     // Controller is being pushed on or presented. 
     print("hello") 
    } 
    else{ 
     // Controller is being shown as result of pop/dismiss/unwind. 
     print("hello2") 
    } 
} 

Answer 1

我通過委託和協議解決了它。

在secondviewcontroller這是tableviewcontroller：

protocol TableViewControllerDelegate { 
    func controller(_ controller: TableViewController, didAddItem: String) 
} 
class TableViewController: UIViewController, UITableViewDelegate,UITableViewDataSource { 

    var delegate: TableViewControllerDelegate? 
    ... 

在secondviewcontroller

delegate?.controller(self, didAddItem: "hello") 

在firstviewcontroller賽格瑞部分：

class MainViewController: UIViewController, TableViewControllerDelegate{ 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     if segue.identifier == "Segue" { 
      let destination = segue.destination as? TableViewController 
      if let viewController = destination 
      { 
       viewController.delegate = self as TableViewControllerDelegate 
      } 
     } 
     // Get the new view controller using segue.destinationViewController. 
     // Pass the selected object to the new view controller. 
    } 
    // MARK: Add Item View Controller Delegate Methods 

    func controller(_ controller: TableViewController, didAddItem: String) { 
     // Update Data Source 

     // Reload Table View 
     mainStackView.isHidden = false 
     // Dismiss Add Item View Controller 
     dismiss(animated: true) 
    } 
}