UISearchBar 取消按钮 [英] UISearchBar Cancel Button

问题描述

在 iOS 5 上使用带有 showCancelButton=YES 的 UISearchBar.希望在键盘下降时取消按钮保持启用状态.使用以下代码似乎不起作用:

Using a UISearchBar with showCancelButton=YES on iOS 5. Would like the cancel button to stay enabled when the keyboard drops down. Using the following code seems not to work:

    for (id subView in self.searchControl.subviews)
    {
        if ([subView isKindOfClass:[UIButton class]])
        {
            UIButton *cancelButton = (UIButton *)subView;
            [cancelButton setEnabled:YES];
            break;
        }         
    }

subView 实际上是一个 UINavigationButton，它似乎不是 UIButton 的子类.我在这里错过了什么???????在 Apple 文档中也找不到有关 UINavigationButton 类的任何信息.

The subView is actually a UINavigationButton which appears not to be subclassed off of UIButton. What am I missing here??????? Also cannot find any info on the UINavigationButton class in the Apple docs.

推荐答案

设置您的搜索栏委托，然后放置此代码.

Set your searchbar delegate and than put this code.

- (void) searchBarSearchButtonClicked:(UISearchBar*) theSearchBar
  {
     [theSearchBar resignFirstResponder];
     [theSearchBar setShowsCancelButton:NO animated:YES];
  }
 - (void)searchBarTextDidBeginEditing:(UISearchBar *)searchBar
  {
     [searchBar setShowsCancelButton:YES animated:YES];
  }
  - (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
  {
     [searchBar resignFirstResponder];
     [searchBar setShowsCancelButton:NO animated:YES];
  }

斯威夫特 3.0

func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
     searchBar.resignFirstResponder()
     searchBar.setShowsCancelButton(false, animated: true)
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
     searchBar.setShowsCancelButton(true, animated: true)
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
     searchBar.resignFirstResponder()
     searchBar.setShowsCancelButton(false, animated: true)
}

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