问题描述
我在 xamarin 表单 iOS 平台中有一个 xamarin 表单网格和一个为该网格编写的自定义渲染器。并将BecomeFirstResposnder 应用到OnElementPropertyChanged 上的Customrenderer。添加了 UIKeyCommand "\t " 到 UIViewController。UpArrow、DownArrow、LeftArrow 除了 Tab 和 Shift+Tab 键之外,每个键都在监听。请帮助我。
//Xamarin Forms Grid 的自定义渲染器
protected override void OnElementPropertyChanged(object sender,PropertyChangedEventArgs e)
{
base.OnElementPropertyChanged(sender,e);
this.BecomeFirstResponder();
if (this.KeyPageRenderer == null)
{
this.KeyPageRenderer = this.GetSfPageRenderer(this.GetControl());
if (this.KeyPageRenderer != null)
{
UIKeyCommand KeyTab = UIKeyCommand.Create(new Nsstring("\t"),new ObjCRuntime.Selector("KeyRecV:"));
this.KeyPageRenderer.AddKeyCommand(KeyTab);
}
}
}
internal UIViewController GetSfPageRenderer(UIView view)
{
if (view != null)
{
var responder = (UIResponder)view;
while (responder != null && !(responder is UIViewController))
{
responder = responder.NextResponder;
}
return responder as UIViewController;
}
return null;
}
public override bool CanBecomeFirstResponder
{
get
{
return true;
}
}
[Export("KeyRecV:")]
private void Excute(UIKeyCommand keyCommand)
{
if ((keyCommand.Input as NSObject).Description == "\t")
{
}
}
解决方法
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