沒有顯示

Question

這裏綱領性導航後退按鈕是我在的appdelegate代碼：

func showMainView() 
    { 
    self.window = UIWindow(frame: UIScreen.main.bounds) 
    let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
    let secondViewController = storyBoard.instantiateViewController(withIdentifier: "PRODUCT_TABBAR_VC_ID") 
    let nav = UINavigationController() 
    nav.pushViewController(secondViewController, animated: true) 
    self.window!.rootViewController = nav 
    self.window!.makeKeyAndVisible() 
    } 

模擬器輸出：

basicaly我想，當用戶按後退按鈕，然後回來了主頁。我的意思是初始頁面。

我試圖與這一個，但它不工作至少一個答案對我來說Navigate Back to previous view controller

注：@馬特說它IMPOSIBLE。所以你能告訴我，我該怎麼做。我是新來的iOS

更新：

當用戶選擇人當時tabviewcontroller第二頁只顯示產品的名單約人。所以如果用戶想看女人然後用戶回主頁選擇女人然後他會看到女人 tabviewcontroller兩頁。

Answer 1

後退按鈕用於返回推送到UINavigationController的早期視圖控制器。在你的代碼中，沒有後退按鈕，因爲沒有東西可以回來; secondViewController是只有視圖控制器推送到UINavigationController。按照AppDelegate.swift

self.window = UIWindow(frame: UIScreen.main.bounds) 
let nav = UINavigationController(rootViewController: FirstViewController()) 
self.window!.rootViewController = nav 
self.window!.makeKeyAndVisible() 

內didFinishLaunchingWithOptions線

Answer 2

將與下面創建FirstViewController.swift：

class FirstViewController: UIViewController { 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     let button1 = UIButton(frame: CGRect(x: 0, y: 0, width: 200, height: 200)) 
     button1.setTitle("Man", for: .normal) 
     button1.tag = 1 
     self.view.addSubview(button1) 
     button1.addTarget(self, action: #selector(showAction(sender:)), for: .touchUpInside) 

     let button2 = UIButton(frame: CGRect(x: 0, y: 250, width: 200, height: 200)) 
     button2.setTitle("Woman", for: .normal) 
     button2.tag = 2 
     self.view.addSubview(button2) 
     button2.addTarget(self, action: #selector(showAction(sender:)), for: .touchUpInside) 

    } 

    func showAction(sender: UIButton) { 
     let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil) 
     let secondViewController = storyBoard.instantiateViewController(withIdentifier: "PRODUCT_TABBAR_VC_ID") 
     if (sender.tag == 1) { 
      // SHOW MAN 
     } else if (sender.tag == 2) { 
      // SHOW WOMAN 
     } 
     self.navigationController?.pushViewController(secondViewController, animated: true) 
    } 

} 

Answer 3

您應該創建的層次結構如下所示：

                   ----> UIViewController 
----> UINavigationController ----> UIViewController ----> UITabBarController 
                      ----> UIViewController 

編輯：它看起來像這樣：

這樣就可以彈出包含在UITabBarController中的UIViewControllers。