Ios Xamarin UIButton具有多个事件处理程序
我遇到了一个问题,单元格中的UIButtons在Xamarin中分配了多个事件处理程序。有没有办法确保只分配一个事件处理程序?我假设在重新加载tableview或collectionview时,这些单元格中的任何内容都将被释放/重置。这不对吗 下面是我在委托中设置单元格的位置:Ios Xamarin UIButton具有多个事件处理程序,ios,events,xamarin,uibutton,handler,Ios,Events,Xamarin,Uibutton,Handler,我遇到了一个问题,单元格中的UIButtons在Xamarin中分配了多个事件处理程序。有没有办法确保只分配一个事件处理程序?我假设在重新加载tableview或collectionview时,这些单元格中的任何内容都将被释放/重置。这不对吗 下面是我在委托中设置单元格的位置: public override UICollectionViewCell GetCell(UICollectionView collectionView, NSIndexPath indexPath) {
public override UICollectionViewCell GetCell(UICollectionView collectionView, NSIndexPath indexPath)
{
EventHandler clickTarget = (sender, e) =>
{
if (this.parantController.showCategories)
{
this.parantController.apiCallGetBusinessesIndustries(this.parantController.businessesCategoriesResponseModel.business_categories[indexPath.Row].id);
this.parantController.showIndustries = true;
this.parantController.showCategories = false;
}
else if (this.parantController.showIndustries)
{
this.parantController.apiCallGetBusinessessList("", this.parantController.businessesIndustriesResponseModel.business_industries[indexPath.Row].id);
this.parantController.filterView.Hidden = true;
this.parantController.showVerticalList = false;
this.parantController.showIndustries = false;
this.parantController.clearAll = true;
this.parantController.filterCollectionView.ReloadData();
this.parantController.clearAll = false;
//this.parantController.showCategories = true;
}
};
var cell = (FilterCollectionCell)collectionView.DequeueReusableCell("filterCollectionCell", indexPath);
if (this.parantController.businessesCategoriesResponseModel.business_categories != null && !this.parantController.showIndustries)
{
cell.updateCell(false, this.parantController.businessesCategoriesResponseModel.business_categories[indexPath.Row].name, clickTarget);
}
if (this.parantController.showIndustries)
{
cell.updateCell(false, this.parantController.businessesIndustriesResponseModel.business_industries[indexPath.Row].name, clickTarget);
}
return cell;
}
下面是我将事件处理程序添加到单元视图控制器中按钮的代码:
public void updateCell(Boolean selectedFilterType, string title, EventHandler clickHandler) {
btnFilter.RemoveTarget(this, null, UIControlEvent.AllEvents);
btnFilter.AddTarget(clickHandler, UIControlEvent.TouchUpInside);// = handlerToUse;
this.btnFilter.SetTitle(title, UIControlState.Normal);
}
您的
FilterCollectionCell
创建应处理将事件应用到单元格的操作,以便在重用单元格时,您不会每次在GetCell
方法中追加新事件
否则,您可以检索所有ubutton的目标,并在每次请求单元格时删除它们:
foreach (var target in button.AllTargets)
{
button.RemoveTarget(target, null, UIControlEvent.AllTouchEvents);
}
我将如何处理在FilterCollectionCell中应用事件?@sushinhan是否有任何指导?