如何访问searchBar的明文按钮？

发布于 2024-10-05 18:01:38 字数 534 浏览 14 评论 0 原文

当我点击 tableView 搜索上的“清除”按钮（编辑时出现的按钮）时，我试图让键盘消失。如何检测何时单击“清除”按钮，以便我可以退出firstResponder？ 我已经在 textDidChange 方法中尝试过这个：

if (SearchBar.text == @"") {
    [SearchBar resignFirstResponder];
    NSLog(@"clear called");
}

这不起作用......并且也尝试过：

 if (SearchBar.text == nil) {
    [SearchBar resignFirstResponder];
    NSLog(@"clear called");
}

这两个方法都表明它们被调用。有什么想法吗？

编辑：现在resignFirstResponder似乎不起作用。键盘保留在屏幕上。我做错了什么？

原文

When I hit the "clear" button (the one that appears when editing) on the tableView search, I was trying to get the keyboard to disappear. How can I detect when the "clear" button is clicked, so I can resign the firstResponder? I already tried this in the textDidChange method:

if (SearchBar.text == @"") {
    [SearchBar resignFirstResponder];
    NSLog(@"clear called");
}

which did not work...and also tried:

 if (SearchBar.text == nil) {
    [SearchBar resignFirstResponder];
    NSLog(@"clear called");
}

Neither methods show that they were called. Any ideas?

EDIT: Now resignFirstResponder does not seem to be working. The keyboard stays on screen. What's am I doing wrong?

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猥︴琐丶欲为 2024-10-12 18:01:38

对于字符串比较，您应该使用

if([SearchBar.text isEqualToString: @""])

For string comparison you should use

if([SearchBar.text isEqualToString: @""])

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梦中的蝴蝶 2024-10-12 18:01:38

您可以尝试通过注册 KVO 通知来观察搜索栏的 text 属性：

[self.searchBar addObserver:self forKeyPath:@"text" options:NSKeyValueObservingOptionNew context:NULL];

然后实现：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
  if (object == self.searchBar && [keyPath isEqualToString:@"text"]) {
    // Handle the new value of self.searchBar.text
  }
}

编辑：没关系，上面回答 =)

You can try watching the text property of the search bar by registering for a KVO notification:

[self.searchBar addObserver:self forKeyPath:@"text" options:NSKeyValueObservingOptionNew context:NULL];

and then implementing:

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
  if (object == self.searchBar && [keyPath isEqualToString:@"text"]) {
    // Handle the new value of self.searchBar.text
  }
}

Edit: nevermind, answered above =)

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