c#之Xamarin iOS 在点击时隐藏占位符

我有一个 Xamarin iOS 应用程序，它有文本字段，所以我希望我的文本字段在单击时隐藏它们的占位符，而不仅仅是在我开始输入字母时，这可能吗？

请您参考如下方法:

类似下面的内容:

  string _placeHolderText = "Some Test Placeholder..."; 
 
  public override void ViewWillAppear (bool animated) 
  { 
     base.ViewWillAppear (animated); 
 
     var textView1 = new UITextField (new CGRect (0, 0, UIScreen.MainScreen.Bounds.Width, 100)) { 
        Placeholder = _placeHolderText, 
        BorderStyle = UITextBorderStyle.Line 
     }; 
     textView1.EditingDidBegin += (object sender, EventArgs e) => 
     { 
        textView1.Placeholder = string.Empty; 
     }; 
     textView1.EditingDidEnd += (object sender, EventArgs e) => 
     { 
        textView1.Placeholder = _placeHolderText; 
     }; 
 
     var textView2 = new UITextField (new CGRect (0, textView1.Frame.Bottom, UIScreen.MainScreen.Bounds.Width, 100)) { 
        Placeholder = _placeHolderText, 
        BorderStyle = UITextBorderStyle.Line 
     }; 
 
     this.View.AddSubviews (textView1, textView2); 
  }