Ios 三个视图控制器之间的导航，其中所有三个都位于一个选项卡栏视图中

我有一个选项卡栏视图。在这三个选项卡中，有一个是contacts应用程序。在联系人应用程序中，有三个页面，一个显示所有联系人，第二个显示在第一个VC中选择的一个特定联系人，第三个是添加新联系人。（与内置iOS应用程序非常相似）如何在这三个页面之间创建流畅的流（不要忘记它们应该在一个选项卡栏中）

我已经添加了所有必需的按钮

• 第一页-显示所有联系人
• 第二页-显示一个特定联系人
• 第三页-添加新联系人

我嵌入了3个导航视图控制器（3个页面各一个）

第一页有“添加”按钮，该按钮应指向第三页。 第二页有两个按钮，一个返回第一页，另一个返回第三页。 第三个有两个按钮，一个用于转到其他两个页面

我使用此函数在导航栏中以编程方式创建了这些按钮-

    override func viewDidAppear(_ animated: Bool) {
            navigationItem.title = "Add New Contact"
            navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItem.Style.plain, target: self, action: #selector(theTransition))
       }

    @objc func theTransition() {
        let second = self.storyboard?.instantiateViewController(withIdentifier: "OneNavID") as! OneNavigationViewController
        self.present(second, animated: true, completion: nil)
    }

（以上代码是从第3页转到第1页的示例）

这些按钮工作正常，但它们会显示选项卡栏控制器之外的新页面。 我希望它们留在选项卡视图中。请帮忙！如果你对这个问题有任何疑问，一定要问。我尽量用简明扼要的话来解释它。 我在互联网上看过很多次，但我找不到任何三个视图控制器中每个都有一个导航控制器的实例（我认为这是必要的，因为它们每个都有到其他页面的传入和传出链接）

第二页-

override func viewDidAppear(_ animated: Bool) {
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Edit", style: UIBarButtonItem.Style.plain, target: self, action: #selector(theTransition))
    }

    @objc func theTransition() {
        let second = self.storyboard?.instantiateViewController(withIdentifier: "ThreeNavID") as! ThreeNavigationViewController
        self.present(second, animated: true, completion: nil)
    }

第三页-

override func viewDidAppear(_ animated: Bool) {
        navigationItem.title = "Add New Contact"
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: UIBarButtonItem.Style.plain, target: self, action: #selector(theTransition))
    }

    @objc func theTransition() {
        let second = self.storyboard?.instantiateViewController(withIdentifier: "NavID") as! NavigationViewController
        self.present(second, animated: true, completion: nil)
    }

---

不要使用3个导航控制器。像这样使用一个导航控制器

UITabBarController_____ Another View Controller1 
                  |  
                  |____ Another View Controller2
                  |  
                  |____ Contact - UINavigationController -- FirstPage

UINavigationController -- FirstPage --> SecondPage --> ThirdPage

class CustomNavigationController: UINavigationController {
    var name: String?
}

class FirstPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "FirstPage"
    }
    @objc func goToSecondPage() {
        if let secondPage = self.storyboard?.instantiateViewController(withIdentifier: "SecondPage") as? SecondPage {
            self.navigationController?.pushViewController(secondPage, animated: true)
        }
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
}

class SecondPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "SecondPage"
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
    @objc func goToFirstPage() {
        self.navigationController?.popViewController(animated: true)
    }
}
class ThirdPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "ThirdPage"
    }
    @objc func goToFirstPage() {
        self.navigationController?.popToRootViewController(animated: true)
    }
    @objc func goToSecondPage() {
        self.navigationController?.popViewController(animated: true)
    }
}

在导航控制器中嵌入第一页，并嵌入第二页和第三页。不要为第一页创建新实例。用于转到上一个视图控制器

---

可以使用pushViewController将数据传递到下一个视图控制器，并使用自定义委托或闭包将数据发送到上一个视图控制器。或者像这样在自定义导航控制器类中创建一个变量

UITabBarController_____ Another View Controller1 
                  |  
                  |____ Another View Controller2
                  |  
                  |____ Contact - UINavigationController -- FirstPage

UINavigationController -- FirstPage --> SecondPage --> ThirdPage

class CustomNavigationController: UINavigationController {
    var name: String?
}

class FirstPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "FirstPage"
    }
    @objc func goToSecondPage() {
        if let secondPage = self.storyboard?.instantiateViewController(withIdentifier: "SecondPage") as? SecondPage {
            self.navigationController?.pushViewController(secondPage, animated: true)
        }
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
}

class SecondPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "SecondPage"
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
    @objc func goToFirstPage() {
        self.navigationController?.popViewController(animated: true)
    }
}
class ThirdPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "ThirdPage"
    }
    @objc func goToFirstPage() {
        self.navigationController?.popToRootViewController(animated: true)
    }
    @objc func goToSecondPage() {
        self.navigationController?.popViewController(animated: true)
    }
}

然后像这样从其他视图控制器读取和写入数据

UITabBarController_____ Another View Controller1 
                  |  
                  |____ Another View Controller2
                  |  
                  |____ Contact - UINavigationController -- FirstPage

UINavigationController -- FirstPage --> SecondPage --> ThirdPage

class CustomNavigationController: UINavigationController {
    var name: String?
}

class FirstPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "FirstPage"
    }
    @objc func goToSecondPage() {
        if let secondPage = self.storyboard?.instantiateViewController(withIdentifier: "SecondPage") as? SecondPage {
            self.navigationController?.pushViewController(secondPage, animated: true)
        }
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
}

class SecondPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "SecondPage"
    }
    @objc func goToThirdPage() {
        if let thirdPage = self.storyboard?.instantiateViewController(withIdentifier: "ThirdPage") as? ThirdPage {
            self.navigationController?.pushViewController(thirdPage, animated: true)
        }
    }
    @objc func goToFirstPage() {
        self.navigationController?.popViewController(animated: true)
    }
}
class ThirdPage: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        print((self.navigationController as? CustomNavigationController)?.name)
        (self.navigationController as? CustomNavigationController)?.name = "ThirdPage"
    }
    @objc func goToFirstPage() {
        self.navigationController?.popToRootViewController(animated: true)
    }
    @objc func goToSecondPage() {
        self.navigationController?.popViewController(animated: true)
    }
}

---

“外部选项卡栏”是指视图控制器隐藏选项卡栏吗？是的。我认为它创建了一个全新的VC，因此隐藏了选项卡栏。等等，我将尝试共享图像。为什么要展示VC，尝试将它们推送到NavigationControlleri如果您正在代码中实例化一个新的视图控制器，那么它肯定是一个新的视图控制器。同时，您将演示该视图控制器。这也涵盖了这一观点。您需要查找选项卡栏项目的

selectItemAtIndex

。使用它，而不是每次都实例化视图控制器。此外，如果正在推送视图控制器，请将视图控制器的

hidesBottomBarWhenPushed

属性设置为false，以便它不会隐藏选项卡栏。部分有效！但是我该怎么做才能从2变为3，反之亦然。实际上，我正在使用segue从2发送一些数据到3。早些时候它工作得很好，但由于我做了这些改变，它就不再工作了。另外，当我从3返回到2时，我希望单元格中包含名称和数字等值，但它会显示一个全新的空单元格。