导航控制器只需使用Swift？

Question

我从故事板加载了3个视图控制器：

controller1  = storyboard.instantiateViewController(withIdentifier: "ViewController") as! ViewController
controller2 = storyboard.instantiateViewController(withIdentifier: "ModelController") as! ModelController
controller3  = storyboard.instantiateViewController(withIdentifier: "BuyController") as! BuyViewController

我想创建并将这3个控制器加载到带有3个按钮的底部导航栏中。

以编程方式。

我只用简单的几行代码就可以做到这一点？

Answer 1

我为你做了一个示例项目

检查 - https://drive.google.com/open?id=1M12Nv4PLNUePSJFHf7w8b08M2_mWcUEC

一些裁判代码

我的三个VC对象

private lazy var ThirdObject: VC3 =
    {
        // Instantiate View Controller
        let viewController = self.storyboard?.instantiateViewController(withIdentifier: "VC3") as! VC3

        // Add View Controller as Child View Controller
        self.addChildViewController(viewController)
        return viewController
    }()


    private lazy var FirstObject: VC1 =
    {
        // Instantiate View Controller
        let viewController = self.storyboard?.instantiateViewController(withIdentifier: "VC1") as! VC1

        // Add View Controller as Child View Controller
        self.addChildViewController(viewController)
        return viewController
    }()


    private lazy var SecondObject: VC2 =
    {
        // Instantiate View Controller
        let viewController = self.storyboard?.instantiateViewController(withIdentifier: "VC2") as! VC2

        // Add View Controller as Child View Controller
        self.addChildViewController(viewController)
        return viewController
    }()

故事板视图

模拟器屏幕截图

ScreenShot 1 - 未添加任何对象时

ScreenShot 2 - 点击任何按钮时

我点击了第二个所以显示为

注意：我使用了带有三个按钮的工具栏您可以通过在导航栏中添加按钮，显示方法如何操作来做同样的事情，依赖于您想要使用导航控制器或工具栏在屏幕底部