iphone UISearchBar 完成按钮始终启用

Question

我有一个带有 UISearchBar 的 UIViewController。我已将“搜索”按钮替换为“完成”按钮。

但是，当点击搜索栏时，“完成”按钮最初禁用。在输入任何字符之前都会发生这种情况。

我想要做的是让这个“完成”按钮始终启用，这样，如果我点击它，我可以立即关闭键盘。

有什么帮助吗？我们将不胜感激。

我的UIViewController

-(BOOL)searchBarShouldBeginEditing:(UISearchBar *)searchBar  
{   
    return YES;  
}  

-(void)searchBarSearchButtonClicked:(UISearchBar *)searchBar
{
    [searchBar resignFirstResponder];
}  

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText  
{  
    if (searchBar.text.length == 0)  
    {  
        //[self fixOrientation];  
        [searchBar resignFirstResponder];  
    }   
    else  
    {  
        NSLog(@"typed");  
    }  
}  


-(void)searchBarTextDidBeginEditing:(UISearchBar *)theSearchBar  
{  
    NSLog(@"began");  // this executes as soon as i tap on the searchbar, so I'm guessing this is the place to put whatever solution is available  
}  

Answer 1

您可以通过循环 UISearchBar 中的 subview 直到找到文本字段来解决此问题。只需将“enablesReturnKeyAutomatically”设置为“否”即可。顺便说一句，以下代码对于设置键盘类型也很有用。

  // loop around subviews of UISearchBar
  for (UIView *searchBarSubview in [searchBar subviews]) {    
    if ([searchBarSubview conformsToProtocol:@protocol(UITextInputTraits)]) {    
      @try {
        // set style of keyboard
        [(UITextField *)searchBarSubview setKeyboardAppearance:UIKeyboardAppearanceAlert];

        // always force return key to be enabled
        [(UITextField *)searchBarSubview setEnablesReturnKeyAutomatically:NO];
      }
      @catch (NSException * e) {        
        // ignore exception
      }
    }
  }