在UisearchBar中一直显示Xbutton

Question

怎么让UISearchBar中的Xbutton（clear button）一直显示。

for (UIView* v in searchBar.subviews)
{
    if ( [v isKindOfClass: [UITextField class]] )
    {
        UITextField *tf = (UITextField *)v;
        tf.delegate = self;
        tf.clearButtonMode = UITextFieldViewModeAlways;
        break;
    }
}

我试过了没有用，如果我设置tf.clearButtonMode = UITextFieldViewModeNever，xbutton就不显示了。

应该怎么办？

我需要在文本长度等于0的状态一直显示Xbutton。

Answer 1

需要再创建一个自定义UIButton。

UIButton *clearButton = [UIButton buttonWithType:UIButtonTypeCustom];
[clearButton setImage:img forState:UIControlStateNormal];
[clearButton setFrame:frame];
[clearButton addTarget:self action:@selector(clearTextField:) forControlEvents:UIControlEventTouchUpInside];

textField.rightViewMode = UITextFieldViewModeAlways; //can be changed to UITextFieldViewModeNever,    UITextFieldViewModeWhileEditing,   UITextFieldViewModeUnlessEditing
[textField setRightView:clearButton];