Xamarin.iOS中的單選按鈕偵聽水龍頭？

我需要使用兩個單選按鈕來工作，一次只能單擊一個按鈕。使用用戶Alanc Liu在這裏發佈的答案：Radio button in xamarin.ios我已經讓我的視圖控制器看起來正確了，但我無法弄清楚如何監聽水龍頭以將另一個單選按鈕設置爲false。我已經嘗試在ViewDidLoad方法中添加一個手勢識別器，但還沒有得到任何工作（我大多隻是使用以前的故事板來添加方法來按鈕點擊）。Xamarin.iOS中的單選按鈕偵聽水龍頭？

我的視圖控制器：

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); 
    } 
}

他的單選按鈕類：

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(); 
    } 
} 
}

來源

2017-10-10 Ryan R

在MyRadioButton公開公共事件，調用它，當我們挖掘的單選按鈕。

守則MyRadioButton：

//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); 
});

處理該事件的的viewController

代碼裏面ViewController

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; 
}

結果：

來源

2017-10-11 05:38:47

Xamarin.iOS中的單選按鈕偵聽水龍頭？

回答

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