我的委托协议从未调用过

我的第一个控制器--ViewController

class ViewController: UIViewController,testProtocol {

    @IBAction func btInit(sender: AnyObject) {
        println("Bt Init")

        let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let initViewController: UIViewController = storyBoard.instantiateViewControllerWithIdentifier("viewTarget") as targetViewController
        self.presentViewController(initViewController,animated: false, nil)

    }

    var targetController = targetViewController();

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

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func testDelegate(){
        println(" in my view controller delegate ")
    }
}

在我的第二个视图控制器 - targetViewController

protocol testProtocol {
    func testDelegate() …

我决定使用MVVM Light库来帮助设计UI.经过大量的研究和反复试验,我还没有找到我想要的答案.我用谷歌搜索并阅读了我能找到的每个StackOverflow问题,然而,我的问题似乎在SO上是独一无二的.

我希望设计一个带有单个窗口的UI,并使用不同的Views/UserControls填充它.我不想在UserControls中使用共享导航栏,也不想弹出多个窗口.每个View/UserControl都应绑定到自己的ViewModel,而MainWindow将绑定到MainViewModel.

示例场景 - 具有3个UserControl的MainWindow

1. MainWindow populates with first UserControl which has a listbox and 3 buttons, the first button is enabled.
2. User clicks the first button.
3. MainWindow populates with second UserControl.

或者,另外

 2. User selects choice from a listbox, button two and three become available.
 3. User clicks second/third button.
 4. MainWindow populates with second/third UserControl.

等等

也许我的方法不现实,但我觉得这必须是可能的.我不明白如何让所有这些作品在概念上发挥作用.我的欲望绝不是独一无二的.如果您认为这是重复的问题,请重定向.干杯.

为了使事情更容易理解,我在下面列出了一些课程.首先,我的App.xaml.

<Application x:Class="Bobcat_BETA.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:views="clr-namespace:Bobcat_BETA.UserControls"
             xmlns:vm="clr-namespace:Bobcat_BETA.ViewModels"
             StartupUri="MainWindow.xaml"
             mc:Ignorable="d">
    <Application.Resources>
        <vm:ViewModelLocator x:Key="Locator" d:IsDataSource="True" />

        <DataTemplate …