使用Monotouch更改UISearchBar上的“取消”按钮的文本

本文关键字：按钮 文本 取消 Monotouch 更改 UISearchBar 上的 使用 | 更新日期: 2023-09-27 18:01:35

我需要改变取消按钮的文本总是显示"重置"在我的应用程序。我在SO上发现了许多类似的问题，但所有的答案都是针对ObjC的，而我在Monotouch上工作。

使用Monotouch更改UISearchBar上的“取消”按钮的文本

在iOS7+上使用下面的扩展方法，如下所示:

它来源于Kolbjørn Bredrup的评论，这是伟大的，但我不清楚它内部使用的额外扩展方法(OfType和FirstOrDefault)的名称空间是什么，所以我自己将它们添加到这个类中。

我还重命名了类uisearchbareextensions，以便它与我的其他类很好地放在一起。

感谢Kolbjørn Bredrup提供的原文!

和原文一样，使用

searchBar.SetCancelTitle("关闭");

public static class UISearchBarExtensions
{
    /// <summary>
    /// Finds the Cancelbutton
    /// </summary>
    /// <returns></returns>
    public static UIButton GetCancelButton(this UISearchBar searchBar)
    {
        //Look for a button, probably only one button, and that is probably the cancel button.
        return (UIButton)searchBar.GetAllSubViews().OfType<UIButton>().FirstOrDefault();
    }
    public static UIView FirstOrDefault(this IEnumerable<UIView> views)
    {
        return ((List<UIView>)views)[0];
    }
    public static IEnumerable<UIView> OfType<T>(this IEnumerable<UIView> views)
    {
        List<UIView> response = new List<UIView>();
        foreach(var view in views)
        {
            if(view.GetType() == typeof(T))
            {
                response.Add(view);
            }
        }
        return response;
    }
    /// <summary>
    /// Recursively traverses all subviews and returns them in a little list.
    /// </summary>
    /// <param name="view"></param>
    /// <returns></returns>
    public static IEnumerable<UIView> GetAllSubViews(this UIView view)
    {
        List<UIView> retList = new List<UIView>();
        retList.AddRange(view.Subviews);
        foreach (var subview in view.Subviews)
        {
            retList.AddRange(subview.GetAllSubViews());
        }
        return retList;
    }
    /// <summary>
    /// Sets the title of the search bars cancel button
    /// </summary>
    /// <param name="searchBar"></param>
    /// <param name="cancelTitle"></param>
    public static void SetCancelTitle(this UISearchBar searchBar, string cancelTitle)
    {
        searchBar.GetCancelButton().SetTitle(cancelTitle, UIControlState.Normal);
    }
}

注意，ios6和ios7的子视图层次结构是不同的。

但是通过添加下面的扩展方法，您可以使用 
searchBar.SetCancelTitle("NO!");

适用于ios7和ios5/ios6的扩展方法:

public static class NimbleSearchBarExtensions
{
    /// <summary>
    /// Finds the Cancelbutton
    /// </summary>
    /// <returns></returns>
    public static UIButton GetCancelButton(this UISearchBar searchBar)
    {
        //Look for a button, probably only one button, and that is probably the cancel button.
        return searchBar.GetAllSubViews().OfType<UIButton>().FirstOrDefault();
    }
    /// <summary>
    /// Recursively traverses all subviews and returns them in a little list.
    /// </summary>
    /// <param name="view"></param>
    /// <returns></returns>
    public static IEnumerable<UIView> GetAllSubViews(this UIView view)
    {
        List<UIView> retList = new List<UIView>();
        retList.AddRange(view.Subviews);
        foreach (var subview in view.Subviews)
        {
            retList.AddRange(subview.GetAllSubViews());
        }
        return retList;
    }
    /// <summary>
    /// Sets the title of the search bars cancel button
    /// </summary>
    /// <param name="searchBar"></param>
    /// <param name="cancelTitle"></param>
    public static void SetCancelTitle(this UISearchBar searchBar, string cancelTitle)
    {
        searchBar.GetCancelButton().SetTitle(cancelTitle,UIControlState.Normal);
    }
}

这很简单-

UIButton btnCancel = (UIButton)SearchBar.Subviews[3];
btnCancel.SetTitle ("test", UIControlState.Normal);
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