Xamarin.iOS中的单选按钮是否收听点击？

我需要得到一个有两个单选按钮的视图，一次只能点击一个。使用用户Alanc Liu在这里发布的答案：我的视图控制器看起来是正确的，但我不知道如何监听点击以将另一个单选按钮设置为false

我尝试过在ViewDidLoad方法中添加一个手势识别器，但还没有得到任何效果（我以前主要是使用故事板为按钮点击添加方法）

我的视图控制器：

public partial class VerifyViewController : UIViewController
{
    public VerifyViewController (IntPtr handle) : base (handle)
    {            
    }

    public override void ViewDidLoad()
    {
        base.ViewDidLoad();

        MyRadioButton tBtn = new MyRadioButton(new CGPoint(100, 300), "TEXT PHONE");
        MyRadioButton eBtn = new MyRadioButton(new CGPoint(100, 375), "EMAIL");

        this.Add(tBtn);
        this.Add(eBtn);
    }
}

还有他的单选按钮课程：

public class MyRadioButton : UIView
{
private CircleView circleView;
private UILabel lbTitle;

public bool State {
    get {
        return circleView.State;
    }
    set {
        circleView.State = value;
    }
}

public MyRadioButton (CGPoint pt,string title)
{
    this.Frame = new CGRect (pt, new CGSize (150, 30));
    circleView = new CircleView (new CGRect(0, 0, 30, 30));
    lbTitle = new UILabel (new CGRect (30, 0, 120, 30));
    lbTitle.Text = title;
    lbTitle.TextAlignment = UITextAlignment.Center;
    this.AddSubview (circleView);
    this.AddSubview (lbTitle);
    this.BackgroundColor = UIColor.FromRGBA(1,0,0,0.3f);

    UITapGestureRecognizer tapGR = new UITapGestureRecognizer (() => {
        State = !State;
    });
    this.AddGestureRecognizer (tapGR);
}
}

class CircleView : UIView
{
private bool state = false;
public bool State { 
    get {
        return state;
    }
    set {
        state = value;
        this.SetNeedsDisplay ();
    }
}

public CircleView (CGRect frame)
{
    this.BackgroundColor = UIColor.Clear;
    this.Frame = frame;
}

public override void Draw (CoreGraphics.CGRect rect)
{
    CGContext con = UIGraphics.GetCurrentContext ();

    float padding = 5;
    con.AddEllipseInRect (new CGRect (padding, padding, rect.Width - 2 * padding, rect.Height - 2 * padding));
    con.StrokePath ();

    if (state) {
        float insidePadding = 8;
        con.AddEllipseInRect (new CGRect (insidePadding, insidePadding, rect.Width - 2 * insidePadding, rect.Height - 2 * insidePadding));
        con.FillPath ();
    }
}
}

在MyRadioButton中显示公共事件，点击单选按钮时调用它

MyRadioButton中的代码

//define the event inside MyRadioButton
public delegate void TapHandler(MyRadioButton sender);
public event TapHandler Tap;

//call it in MyRadioButton(CGPoint pt, string title)
UITapGestureRecognizer tapGR = new UITapGestureRecognizer(() => {
    State = !State;
    Tap(this);
});

在viewController中处理事件

查看控制器中的代码

MyRadioButton tBtn = new MyRadioButton(new CGPoint(100, 300), "TEXT PHONE");
MyRadioButton eBtn = new MyRadioButton(new CGPoint(100, 375), "EMAIL");

this.Add(tBtn);
this.Add(eBtn);

tBtn.Tap += Btn_Tap;
eBtn.Tap += Btn_Tap;
// set the default selection
Btn_Tap(tBtn);

MyRadioButton PreviousButton;
private void Btn_Tap(MyRadioButton sender)
{
    if(PreviousButton != null)
    {
        //set previous to false
        PreviousButton.State = false;
    }
    //set current to true
    sender.State = true;
    //assign current to previous
    PreviousButton = sender;
}

结果: