iPhone SDK:无法从搜索栏访问文本字段

Question

我创建了一个带有Cancle按钮的自定义搜索栏。我想启用取消按钮每次。但它只有在我开始编辑搜索栏后才启用。我写了以下代码。

#pragma mark - Search Bar Methods
-(void)addSearchBar{
    self.searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 65, 320, 44)];
    [self.view addSubview:self.searchBar];
    self.searchBar.showsCancelButton = YES;
    self.searchBar.delegate = self;
  for (UIView *searchBarSubview in [self.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
      }
    }
  }

}
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar
{
    [self.searchBar resignFirstResponder];
    [self.searchBar removeFromSuperview];
    [btnSearch setEnabled:TRUE];
}
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
    [self.searchBar resignFirstResponder];
}

但是我无法从它的子视图中获取textField。请帮忙。

Answer 1

尝试使用此代码从搜索栏获取文本字段

for (UIView *subView in self.searchBar.subviews){
        for (UIView *searchView in subView.subviews){
            if ([searchView isKindOfClass:[UITextField class]])
                {
                [(UITextField *)searchView setKeyboardAppearance:UIKeyboardAppearanceAlert];
                [(UITextField *)searchView setEnablesReturnKeyAutomatically:NO];
                break;
                }
        }
    }