我需要一个有两个单选按钮的 View ,一次只能点击一个。使用用户 Alanc Liu 在此处发布的答案:Radio button in xamarin.ios我的 View Controller 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。
我试过向 ViewDidLoad 方法添加手势识别器,但还没有任何效果(我以前主要只是使用 Storyboard 来为按钮点击添加方法)。
我的 View Controller :
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);
}
}
和他的单选按钮类:
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 ();
}
}
}
最佳答案
在 MyRadioButton 中公开一个公共(public)事件,当我们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); });
在您的 viewController 中处理事件
ViewController
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:
关于xamarin.ios - Xamarin.iOS 中的单选按钮听点击?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46672043/