使用Monotouch更改UISearchBar上「取消」按鈕的文本？

Question

我需要更改取消按鈕的文本，以在我的應用程序中始終顯示「重置」。 我在這裏發現了很多similar問題，但所有的答案都是針對ObjC的，而我在Monotouch中工作。

Answer 1

這是非常容易的 -

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

Answer 2

注意，子視圖層次是在iOS6的和ios7不同。

但通過添加以下你的擴展方法可以使用，在ios7和工作的ios5/iOS6的

searchBar.SetCancelTitle("NO!"); 

擴展方法：

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); 
    } 
} 

Answer 3

使用下面的iOS7 +這樣的擴展方法：搜索欄.SetCancelTitle（ 「關閉」）;

它來源於KolbjørnBredrup的評論，這很棒，但我不清楚它內部使用的額外擴展方法（OfType和FirstOrDefault）的名稱空間是什麼，所以我將它們添加到了這個類中。

我也重命名類UISearchBarExtensions，以便它與我的其他人很好地坐在一起。

感謝KolbjørnBredrup原創！

與原來的，則它使用被稱爲：

searchBar.SetCancelTitle（ 「關閉」）;

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); 
    } 
}