Question

当我启用 ScopeBar 并在 Monotouch.Dialog 控件上连接 SelectedScopeButtonIndexChanged 时，启用了自动搜索功能设置已启用EnabledSearch = true 。

以下是它被禁用的方式：

     UISearchBar sb = SearchBar;
     if (sb != null)
     {
        sb.ScopeButtonTitles = new string[] { "Girl".t(),"Boy".t(),"All".t() };
        sb.ShowsScopeBar = true;
        sb.SizeToFit();
        // THIS NEXT LINE KILLS SEARCH, remove to make it all work again
        sb.SelectedScopeButtonIndexChanged+= (sender, e) => {Update();};
     }

Answer 1

这打破了搜索的原因是因为DialogViewController在UISearchBar上分配了一个自定义的UISearchBarDelegate。

当你连接到一个事件时，它会破坏委托并用一个特殊的UISearchBarDelegate替换它，它将所有委托方法转发给事件。

换句话说，您不能将代理与同一控件上的事件混合和匹配。

一种可能的解决方案（如果您不想修补MonoTouch.Dialog本身），就是用您自己的自定义UISearchBarDelegate替换现有的sb.Delegate，它可以实现SearchScope方法并将其他所有内容转发给已经是UISearchBarDelegate的UISearchBarDelegate先前设定。

例如：

public class MySearchBarDelegate : UISearchBarDelegate
{
    UISearchBarDelegate original;
    MyDialogViewController dvc;

    public MySearchBarDelegate (MyDialogViewController dvc, UISearchBarDelegate original)
    {
        this.original = original;
    }

    public override void SelectedScopeButtonIndexChanged (UISearchBar searchBar, int selectedScope)
    {
        dvc.Update ();
    }

    public override void OnEditingStarted (UISearchBar searchBar)
    {
        original.OnEditingStarted (searchBar);
    }

    public override void OnEditingStopped (UISearchBar searchBar)
    {
        original.OnEditingStopped (searchBar);
    }

    public override void TextChanged (UISearchBar searchBar, string searchText)
    {
        original.TextChanged (searchBar, searchText);
    }

    public override void CancelButtonClicked (UISearchBar searchBar)
    {
        original.CancelButtonClicked (searchBar);
    }

    public override void SearchButtonClicked (UISearchBar searchBar)
    {
        original.SearchButtonClicked (searchBar);
    }
}

Monotouch.Dialog：启用ScopeBar时禁用自动搜索

1 个答案: