如何在uisearchbar中始终显示Xbutton(清除按钮)-移动开发问题

How to show Xbutton(clear button) always visible in uisearchbar(如何在uisearchbar中始终显示Xbutton(清除按钮))

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问题描述

在我的应用程序中，我添加了一个 UISearchBar.

In my application, I am adding a UISearchBar.

我的意图是启用 UISearch 栏X 按钮"(清除按钮在 UITextField) 始终可见.

My intent is to enable the UISearch Bar "X button"(clear button in UITextField) to be always visible.

我尝试使用下面的代码来尝试制作X 按钮".始终可见.但是，它不起作用.如果我设置 tf.clearButtonMode = UITextFieldViewModeNever，uitextfield<中的清除按钮/a> 不显示.不知道怎么回事?

I have tried using the following code below to try to make the "X Button" be always visible. However, it does not work. If I set tf.clearButtonMode = UITextFieldViewModeNever, the clear button in uitextfield not showing. I am not sure what is wrong?

我非常感谢任何人的帮助.为什么这不起作用?

I would really appreciate anyone's help here. Why is this not working?

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

目标:

如果文本长度等于 0，我希望始终显示清除按钮

Goal:

I want to always show the clear button if the text length is equal to 0

即如果我不输入任何文字.

推荐答案

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

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